Back and forth

import os
import opendrift
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.oceandrift import OceanDrift

ncfile = 'backandforth.nc'

o = OceanDrift(loglevel=20)  # Set loglevel to 0 for debug information
reader_norkyst = reader_netCDF_CF_generic.Reader(opendrift.test_data_folder +
    '16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')
#reader_norkyst = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be')

o.add_reader(reader_norkyst)
o.set_config('environment:fallback:land_binary_mask', 0)

17:15:18 INFO    opendrift:513: OpenDriftSimulation initialised (version 1.14.2 / v1.14.2-88-gf09b7bd)
17:15:18 INFO    opendrift.readers:61: Opening file with xr.open_dataset
17:15:19 INFO    opendrift.readers.reader_netCDF_CF_generic:332: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}

Forward run Seeding some particles

lon = 4.2; lat = 60.1;
time = reader_norkyst.start_time
o.seed_elements(lon, lat, radius=1000, number=100, time=time)

o.run(steps=50*4, time_step=900, time_step_output=3600, outfile=ncfile)

17:15:19 INFO    opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
17:15:23 INFO    opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
17:15:23 INFO    opendrift.models.basemodel.environment:232:    sea_surface_height: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    x_wind: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    y_wind: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    upward_sea_water_velocity: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    ocean_vertical_diffusivity: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_significant_height: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    ocean_mixed_layer_thickness: 50.000000
17:15:23 INFO    opendrift.models.basemodel.environment:232:    sea_floor_depth_below_sea_level: 10000.000000
17:15:23 INFO    opendrift:1732: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False]
17:15:23 INFO    opendrift:1732: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False]
17:15:23 INFO    opendrift:1743: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:15:23 INFO    opendrift:1743: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:15:23 INFO    opendrift:1751: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True]
17:15:23 INFO    opendrift:899: Using existing reader for land_binary_mask
17:15:23 INFO    opendrift:928: All points are in ocean
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17:15:25 INFO    opendrift:2035: 2015-11-17 19:30:00 - step 175 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 19:45:00 - step 176 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 20:00:00 - step 177 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 20:15:00 - step 178 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 20:30:00 - step 179 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 20:45:00 - step 180 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 21:00:00 - step 181 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 21:15:00 - step 182 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 21:30:00 - step 183 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 21:45:00 - step 184 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 22:00:00 - step 185 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 22:15:00 - step 186 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 22:30:00 - step 187 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 22:45:00 - step 188 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 23:00:00 - step 189 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 23:15:00 - step 190 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 23:30:00 - step 191 of 200 - 100 active elements (0 deactivated)
17:15:25 INFO    opendrift:2035: 2015-11-17 23:45:00 - step 192 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 00:00:00 - step 193 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 00:15:00 - step 194 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 00:30:00 - step 195 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 00:45:00 - step 196 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 01:00:00 - step 197 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 01:15:00 - step 198 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 01:30:00 - step 199 of 200 - 100 active elements (0 deactivated)
17:15:26 INFO    opendrift:2035: 2015-11-18 01:45:00 - step 200 of 200 - 100 active elements (0 deactivated)

<xarray.Dataset> Size: 490kB
Dimensions:                                   (trajectory: 100, time: 51)
Coordinates:
  * trajectory                                (trajectory) int32 400B 0 1 ... 99
  * time                                      (time) datetime64[ns] 408B 2015...
Data variables: (12/21)
    status                                    (trajectory, time) float64 41kB ...
    moving                                    (trajectory, time) float64 41kB ...
    age_seconds                               (trajectory, time) float32 20kB ...
    origin_marker                             (trajectory, time) float64 41kB ...
    lon                                       (trajectory, time) float32 20kB ...
    lat                                       (trajectory, time) float32 20kB ...
    ...                                        ...
    upward_sea_water_velocity                 (trajectory, time) float32 20kB ...
    sea_surface_wave_significant_height       (trajectory, time) float32 20kB ...
    sea_surface_wave_stokes_drift_x_velocity  (trajectory, time) float32 20kB ...
    sea_surface_wave_stokes_drift_y_velocity  (trajectory, time) float32 20kB ...
    sea_floor_depth_below_sea_level           (trajectory, time) float32 20kB ...
    land_binary_mask                          (trajectory, time) float32 20kB ...
Attributes: (12/119)
    Conventions:                                                           CF...
    standard_name_vocabulary:                                              CF...
    featureType:                                                           tr...
    title:                                                                 Op...
    summary:                                                               Ou...
    keywords:                                                              tr...
    ...                                                                    ...
    geospatial_lon_units:                                                  de...
    geospatial_lon_resolution:                                             point
    runtime:                                                               0:...
    geospatial_vertical_min:                                               0.0
    geospatial_vertical_max:                                               0.0
    geospatial_vertical_positive:                                          up

xarray.Dataset

• Dimensions:
  • trajectory: 100
  • time: 51
• Coordinates: (2)
  • trajectory
    (trajectory)
    int32
    0 1 2 3 4 5 6 ... 94 95 96 97 98 99

    cf_role :

    trajectory_id

    array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
           18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
           36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
           54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
           72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
           90, 91, 92, 93, 94, 95, 96, 97, 98, 99], dtype=int32)

  • time
    (time)
    datetime64[ns]
    2015-11-16 ... 2015-11-18T02:00:00

    standard_name :

    time

    long_name :

    time

    array(['2015-11-16T00:00:00.000000000', '2015-11-16T01:00:00.000000000',
           '2015-11-16T02:00:00.000000000', '2015-11-16T03:00:00.000000000',
           '2015-11-16T04:00:00.000000000', '2015-11-16T05:00:00.000000000',
           '2015-11-16T06:00:00.000000000', '2015-11-16T07:00:00.000000000',
           '2015-11-16T08:00:00.000000000', '2015-11-16T09:00:00.000000000',
           '2015-11-16T10:00:00.000000000', '2015-11-16T11:00:00.000000000',
           '2015-11-16T12:00:00.000000000', '2015-11-16T13:00:00.000000000',
           '2015-11-16T14:00:00.000000000', '2015-11-16T15:00:00.000000000',
           '2015-11-16T16:00:00.000000000', '2015-11-16T17:00:00.000000000',
           '2015-11-16T18:00:00.000000000', '2015-11-16T19:00:00.000000000',
           '2015-11-16T20:00:00.000000000', '2015-11-16T21:00:00.000000000',
           '2015-11-16T22:00:00.000000000', '2015-11-16T23:00:00.000000000',
           '2015-11-17T00:00:00.000000000', '2015-11-17T01:00:00.000000000',
           '2015-11-17T02:00:00.000000000', '2015-11-17T03:00:00.000000000',
           '2015-11-17T04:00:00.000000000', '2015-11-17T05:00:00.000000000',
           '2015-11-17T06:00:00.000000000', '2015-11-17T07:00:00.000000000',
           '2015-11-17T08:00:00.000000000', '2015-11-17T09:00:00.000000000',
           '2015-11-17T10:00:00.000000000', '2015-11-17T11:00:00.000000000',
           '2015-11-17T12:00:00.000000000', '2015-11-17T13:00:00.000000000',
           '2015-11-17T14:00:00.000000000', '2015-11-17T15:00:00.000000000',
           '2015-11-17T16:00:00.000000000', '2015-11-17T17:00:00.000000000',
           '2015-11-17T18:00:00.000000000', '2015-11-17T19:00:00.000000000',
           '2015-11-17T20:00:00.000000000', '2015-11-17T21:00:00.000000000',
           '2015-11-17T22:00:00.000000000', '2015-11-17T23:00:00.000000000',
           '2015-11-18T00:00:00.000000000', '2015-11-18T01:00:00.000000000',
           '2015-11-18T02:00:00.000000000'], dtype='datetime64[ns]')

• Data variables: (21)
  • status
    (trajectory, time)
    float64
    ...

    valid_range :

    [0 0]

    flag_values :

    0

    flag_meanings :

    active

    [5100 values with dtype=float64]

  • moving
    (trajectory, time)
    float64
    ...

    minval :

    1

    maxval :

    1

    [5100 values with dtype=float64]

  • age_seconds
    (trajectory, time)
    float32
    ...

    units :

    s

    minval :

    0.0

    maxval :

    180000.0

    [5100 values with dtype=float32]

  • origin_marker
    (trajectory, time)
    float64
    ...

    unit :

    description :

    An integer kept constant during the simulation. Different values may be used for different seedings, to separate elements during analysis. With GUI, only a single seeding is possible.

    flag_values :

    0

    flag_meanings :

    Seed_0

    minval :

    0

    maxval :

    0

    [5100 values with dtype=float64]

  • lon
    (trajectory, time)
    float32
    ...

    units :

    degrees_east

    standard_name :

    longitude

    long_name :

    longitude

    axis :

    X

    minval :

    4.089438

    maxval :

    4.5535316

    [5100 values with dtype=float32]

  • lat
    (trajectory, time)
    float32
    ...

    units :

    degrees_north

    standard_name :

    latitude

    long_name :

    latitude

    axis :

    Y

    minval :

    60.08004

    maxval :

    60.687393

    [5100 values with dtype=float32]

  • z
    (trajectory, time)
    float32
    ...

    units :

    m

    standard_name :

    z

    long_name :

    vertical position

    axis :

    Z

    positive :

    up

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • wind_drift_factor
    (trajectory, time)
    float32
    ...

    units :

    1

    description :

    Elements at surface are moved with this fraction of the vind vector, in addition to currents and Stokes drift

    minval :

    0.02

    maxval :

    0.02

    [5100 values with dtype=float32]

  • current_drift_factor
    (trajectory, time)
    float32
    ...

    units :

    1

    description :

    Elements are moved with this fraction of the current vector, in addition to currents and Stokes drift

    minval :

    1.0

    maxval :

    1.0

    [5100 values with dtype=float32]

  • terminal_velocity
    (trajectory, time)
    float32
    ...

    units :

    m/s

    description :

    Terminal rise/sinking velocity (buoyancy) in the ocean column

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • x_sea_water_velocity
    (trajectory, time)
    float32
    ...

    minval :

    -0.32976764

    maxval :

    0.5854319

    [5100 values with dtype=float32]

  • y_sea_water_velocity
    (trajectory, time)
    float32
    ...

    minval :

    -0.5421734

    maxval :

    0.9519086

    [5100 values with dtype=float32]

  • sea_surface_height
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • x_wind
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • y_wind
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • upward_sea_water_velocity
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • sea_surface_wave_significant_height
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • sea_surface_wave_stokes_drift_x_velocity
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • sea_surface_wave_stokes_drift_y_velocity
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

  • sea_floor_depth_below_sea_level
    (trajectory, time)
    float32
    ...

    minval :

    10000.0

    maxval :

    10000.0

    [5100 values with dtype=float32]

  • land_binary_mask
    (trajectory, time)
    float32
    ...

    minval :

    0.0

    maxval :

    0.0

    [5100 values with dtype=float32]

• Indexes: (2)
  • trajectory
    PandasIndex

    PandasIndex(Index([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
           18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
           36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
           54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
           72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
           90, 91, 92, 93, 94, 95, 96, 97, 98, 99],
          dtype='int32', name='trajectory'))

  • time
    PandasIndex

    PandasIndex(DatetimeIndex(['2015-11-16 00:00:00', '2015-11-16 01:00:00',
                   '2015-11-16 02:00:00', '2015-11-16 03:00:00',
                   '2015-11-16 04:00:00', '2015-11-16 05:00:00',
                   '2015-11-16 06:00:00', '2015-11-16 07:00:00',
                   '2015-11-16 08:00:00', '2015-11-16 09:00:00',
                   '2015-11-16 10:00:00', '2015-11-16 11:00:00',
                   '2015-11-16 12:00:00', '2015-11-16 13:00:00',
                   '2015-11-16 14:00:00', '2015-11-16 15:00:00',
                   '2015-11-16 16:00:00', '2015-11-16 17:00:00',
                   '2015-11-16 18:00:00', '2015-11-16 19:00:00',
                   '2015-11-16 20:00:00', '2015-11-16 21:00:00',
                   '2015-11-16 22:00:00', '2015-11-16 23:00:00',
                   '2015-11-17 00:00:00', '2015-11-17 01:00:00',
                   '2015-11-17 02:00:00', '2015-11-17 03:00:00',
                   '2015-11-17 04:00:00', '2015-11-17 05:00:00',
                   '2015-11-17 06:00:00', '2015-11-17 07:00:00',
                   '2015-11-17 08:00:00', '2015-11-17 09:00:00',
                   '2015-11-17 10:00:00', '2015-11-17 11:00:00',
                   '2015-11-17 12:00:00', '2015-11-17 13:00:00',
                   '2015-11-17 14:00:00', '2015-11-17 15:00:00',
                   '2015-11-17 16:00:00', '2015-11-17 17:00:00',
                   '2015-11-17 18:00:00', '2015-11-17 19:00:00',
                   '2015-11-17 20:00:00', '2015-11-17 21:00:00',
                   '2015-11-17 22:00:00', '2015-11-17 23:00:00',
                   '2015-11-18 00:00:00', '2015-11-18 01:00:00',
                   '2015-11-18 02:00:00'],
                  dtype='datetime64[ns]', name='time', freq=None))

• Attributes: (119)

  Conventions :

  CF-1.11, ACDD-1.3

  standard_name_vocabulary :

  CF Standard Name Table v85

  featureType :

  trajectory

  title :

  OpenDrift trajectory simulation

  summary :

  Output from simulation with OpenDrift framework

  keywords :

  trajectory, drift, lagrangian, simulation

  history :

  Created 2025-07-11 17:15:23.592414

  date_created :

  2025-07-11T17:15:23.592420

  source :

  Output from simulation with OpenDrift

  model_url :

  https://github.com/OpenDrift/opendrift

  opendrift_class :

  OceanDrift

  opendrift_module :

  opendrift.models.oceandrift

  readers :

  odict_keys(['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc', 'global_landmask'])

  time_coverage_start :

  2015-11-16 00:00:00

  time_step_calculation :

  0:15:00

  time_step_output :

  1:00:00

  config_environment:constant:x_sea_water_velocity :

  None

  config_environment:fallback:x_sea_water_velocity :

  0

  config_environment:constant:y_sea_water_velocity :

  None

  config_environment:fallback:y_sea_water_velocity :

  0

  config_environment:constant:sea_surface_height :

  None

  config_environment:fallback:sea_surface_height :

  0

  config_environment:constant:x_wind :

  None

  config_environment:fallback:x_wind :

  0

  config_environment:constant:y_wind :

  None

  config_environment:fallback:y_wind :

  0

  config_environment:constant:upward_sea_water_velocity :

  None

  config_environment:fallback:upward_sea_water_velocity :

  0

  config_environment:constant:ocean_vertical_diffusivity :

  None

  config_environment:fallback:ocean_vertical_diffusivity :

  0

  config_environment:constant:sea_surface_wave_significant_height :

  None

  config_environment:fallback:sea_surface_wave_significant_height :

  0

  config_environment:constant:sea_surface_wave_stokes_drift_x_velocity :

  None

  config_environment:fallback:sea_surface_wave_stokes_drift_x_velocity :

  0

  config_environment:constant:sea_surface_wave_stokes_drift_y_velocity :

  None

  config_environment:fallback:sea_surface_wave_stokes_drift_y_velocity :

  0

  config_environment:constant:ocean_mixed_layer_thickness :

  None

  config_environment:fallback:ocean_mixed_layer_thickness :

  50

  config_environment:constant:sea_floor_depth_below_sea_level :

  None

  config_environment:fallback:sea_floor_depth_below_sea_level :

  10000

  config_environment:constant:land_binary_mask :

  None

  config_environment:fallback:land_binary_mask :

  0.0

  config_general:use_auto_landmask :

  True

  config_drift:current_uncertainty :

  0

  config_drift:current_uncertainty_uniform :

  0

  config_drift:max_speed :

  2.0

  config_readers:max_number_of_fails :

  1

  config_general:simulation_name :

  config_general:coastline_action :

  stranding

  config_general:coastline_approximation_precision :

  0.001

  config_general:time_step_minutes :

  60

  config_general:time_step_output_minutes :

  None

  config_seed:ocean_only :

  True

  config_seed:number :

  1

  config_drift:max_age_seconds :

  None

  config_drift:advection_scheme :

  euler

  config_drift:horizontal_diffusivity :

  0

  config_drift:profiles_depth :

  50

  config_drift:wind_uncertainty :

  0

  config_drift:relative_wind :

  False

  config_drift:deactivate_north_of :

  None

  config_drift:deactivate_south_of :

  None

  config_drift:deactivate_east_of :

  None

  config_drift:deactivate_west_of :

  None

  config_seed:origin_marker :

  0

  config_seed:z :

  0

  config_seed:wind_drift_factor :

  0.02

  config_seed:current_drift_factor :

  1

  config_seed:terminal_velocity :

  0.0

  config_drift:vertical_advection :

  True

  config_drift:vertical_advection_at_surface :

  False

  config_drift:water_column_stretching :

  False

  config_drift:vertical_advection_correction :

  False

  config_drift:vertical_mixing :

  False

  config_drift:vertical_mixing_at_surface :

  False

  config_vertical_mixing:timestep :

  60

  config_vertical_mixing:diffusivitymodel :

  environment

  config_vertical_mixing:background_diffusivity :

  1.2e-05

  config_vertical_mixing:TSprofiles :

  False

  config_drift:wind_drift_depth :

  0.1

  config_drift:stokes_drift :

  True

  config_drift:stokes_drift_profile :

  Phillips

  config_drift:use_tabularised_stokes_drift :

  False

  config_drift:tabularised_stokes_drift_fetch :

  25000

  config_general:seafloor_action :

  lift_to_seafloor

  config_drift:truncate_ocean_model_below_m :

  None

  config_seed:seafloor :

  False

  opendrift_version :

  1.14.2

  seed_geojson :

  {"features": [], "type": "FeatureCollection"}

  simulation_time :

  2025-07-11 17:15:23.598174

  reader_x_sea_water_velocity :

  ['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc']

  reader_y_sea_water_velocity :

  ['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc']

  reader_sea_surface_height :

  0

  reader_x_wind :

  0

  reader_y_wind :

  0

  reader_upward_sea_water_velocity :

  0

  reader_sea_surface_wave_significant_height :

  0

  reader_sea_surface_wave_stokes_drift_x_velocity :

  0

  reader_sea_surface_wave_stokes_drift_y_velocity :

  0

  reader_sea_floor_depth_below_sea_level :

  10000

  reader_land_binary_mask :

  ['global_landmask']

  time_coverage_end :

  2015-11-18 02:00:00

  time_coverage_duration :

  P2DT2H0M0S

  time_coverage_resolution :

  P0DT0H15M0S

  performance :

  -------------------- Reader performance: -------------------- /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc 0:00:00.4 total 0:00:00.0 preparing 0:00:00.2 reading 0:00:00.0 interpolation 0:00:00.0 interpolation_time 0:00:00.2 rotating vectors 0:00:00.0 masking -------------------- global_landmask 0:00:00.0 total 0:00:00.0 preparing 0:00:00.0 reading 0:00:00.0 masking -------------------- Performance: 7.4 total time 4.9 configuration 0.0 preparing main loop 0.0 moving elements to ocean 2.5 main loop 0.0 updating elements 0.0 cleaning up --------------------

  geospatial_bounds_crs :

  EPSG:4326

  geospatial_bounds_vertical_crs :

  EPSG:5831

  geospatial_lat_min :

  60.08004

  geospatial_lat_max :

  60.687393

  geospatial_lat_units :

  degrees_north

  geospatial_lat_resolution :

  point

  geospatial_lon_min :

  4.089438

  geospatial_lon_max :

  4.5535316

  geospatial_lon_units :

  degrees_east

  geospatial_lon_resolution :

  point

  runtime :

  0:00:07.462537

  geospatial_vertical_min :

  0.0

  geospatial_vertical_max :

  0.0

  geospatial_vertical_positive :

  up

Print and plot results

print(o)
o.plot(buffer=.2, fast=True)

##%%
# Backward run:
# Import forward run, and seed elements at final positions and time
o = opendrift.open(ncfile)
elements_final = o.elements
time_final = o.time
del o
o = OceanDrift(loglevel=20)  # Set loglevel to 0 for debug information
o.set_config('environment:fallback:land_binary_mask', 0)
o.add_reader(reader_norkyst)
o.schedule_elements(elements_final, time_final)

===========================
--------------------
Reader performance:
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
 0:00:00.4  total
 0:00:00.0  preparing
 0:00:00.2  reading
 0:00:00.0  interpolation
 0:00:00.0  interpolation_time
 0:00:00.2  rotating vectors
 0:00:00.0  masking
--------------------
global_landmask
 0:00:00.0  total
 0:00:00.0  preparing
 0:00:00.0  reading
 0:00:00.0  masking
--------------------
Performance:
    7.4 total time
    4.9 configuration
    0.0 preparing main loop
      0.0 moving elements to ocean
    2.5 main loop
      0.0 updating elements
    0.0 cleaning up
--------------------
===========================
Model:  OceanDrift     (OpenDrift version 1.14.2)
        100 active Lagrangian3DArray particles  (0 deactivated, 0 scheduled)
-------------------
Environment variables:
  -----
  x_sea_water_velocity
  y_sea_water_velocity
     1) /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
  -----
  land_binary_mask
     1) global_landmask
  -----
Readers not added for the following variables:
  sea_floor_depth_below_sea_level
  sea_surface_height
  sea_surface_wave_significant_height
  sea_surface_wave_stokes_drift_x_velocity
  sea_surface_wave_stokes_drift_y_velocity
  upward_sea_water_velocity
  x_wind
  y_wind

Discarded readers:

Time:
        Start: 2015-11-16 00:00:00 UTC
        Present: 2015-11-18 02:00:00 UTC
        Calculation steps: 200 * 0:15:00 - total time: 2 days, 2:00:00
        Output steps: 51 * 1:00:00
===========================

17:15:27 WARNING opendrift:2391: Plotting fast. This will make your plots less accurate.
17:15:28 DEBUG   opendrift.config:168: Adding 18 config items from __init__
17:15:28 DEBUG   opendrift.config:178:   Overwriting config item readers:max_number_of_fails
17:15:28 DEBUG   opendrift.config:168: Adding 5 config items from __init__
17:15:28 INFO    opendrift:513: OpenDriftSimulation initialised (version 1.14.2 / v1.14.2-88-gf09b7bd)
17:15:28 DEBUG   opendrift.config:168: Adding 19 config items from oceandrift
17:15:28 DEBUG   opendrift.config:178:   Overwriting config item seed:z
17:15:28 DEBUG   opendrift.export.io_netcdf:105: Importing from backandforth.nc
17:15:28 DEBUG   opendrift:1636: No elements to deactivate
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:x_sea_water_velocity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:x_sea_water_velocity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:y_sea_water_velocity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:y_sea_water_velocity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:sea_surface_height -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:sea_surface_height -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:x_wind -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:x_wind -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:y_wind -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:y_wind -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:upward_sea_water_velocity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:upward_sea_water_velocity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:ocean_vertical_diffusivity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:ocean_vertical_diffusivity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:sea_surface_wave_significant_height -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:sea_surface_wave_significant_height -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:sea_surface_wave_stokes_drift_x_velocity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:sea_surface_wave_stokes_drift_x_velocity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:sea_surface_wave_stokes_drift_y_velocity -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:sea_surface_wave_stokes_drift_y_velocity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:ocean_mixed_layer_thickness -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:ocean_mixed_layer_thickness -> 50
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:sea_floor_depth_below_sea_level -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:sea_floor_depth_below_sea_level -> 10000
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:constant:land_binary_mask -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: environment:fallback:land_binary_mask -> 0.0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:use_auto_landmask -> True
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:current_uncertainty -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:current_uncertainty_uniform -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:max_speed -> 2.0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: readers:max_number_of_fails -> 1
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:simulation_name ->
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:coastline_action -> stranding
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:coastline_approximation_precision -> 0.001
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:time_step_minutes -> 60
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:time_step_output_minutes -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:ocean_only -> True
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:number -> 1
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:max_age_seconds -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:advection_scheme -> euler
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:horizontal_diffusivity -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:profiles_depth -> 50
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:wind_uncertainty -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:relative_wind -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:deactivate_north_of -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:deactivate_south_of -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:deactivate_east_of -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:deactivate_west_of -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:origin_marker -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:z -> 0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:wind_drift_factor -> 0.02
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:current_drift_factor -> 1
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:terminal_velocity -> 0.0
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:vertical_advection -> True
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:vertical_advection_at_surface -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:water_column_stretching -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:vertical_advection_correction -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:vertical_mixing -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:vertical_mixing_at_surface -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: vertical_mixing:timestep -> 60
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: vertical_mixing:diffusivitymodel -> environment
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: vertical_mixing:background_diffusivity -> 1.2e-05
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: vertical_mixing:TSprofiles -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:wind_drift_depth -> 0.1
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:stokes_drift -> True
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:stokes_drift_profile -> Phillips
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:use_tabularised_stokes_drift -> False
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:tabularised_stokes_drift_fetch -> 25000
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: general:seafloor_action -> lift_to_seafloor
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: drift:truncate_ocean_model_below_m -> None
17:15:28 DEBUG   opendrift.export.io_netcdf:150: Setting imported config: seed:seafloor -> False
17:15:28 INFO    opendrift:82: Returning <class 'opendrift.models.oceandrift.OceanDrift'> object
17:15:28 DEBUG   opendrift.models.oceandrift:109: No machine learning correction available.
17:15:28 DEBUG   opendrift.config:168: Adding 26 config items from environment
17:15:28 DEBUG   opendrift.config:168: Adding 5 config items from environment
17:15:28 INFO    opendrift:513: OpenDriftSimulation initialised (version 1.14.2 / v1.14.2-88-gf09b7bd)
17:15:28 INFO    opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
17:15:28 INFO    opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
17:15:28 INFO    opendrift.models.basemodel.environment:232:    sea_surface_height: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    x_wind: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    y_wind: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    upward_sea_water_velocity: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    ocean_vertical_diffusivity: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_significant_height: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    ocean_mixed_layer_thickness: 50.000000
17:15:28 INFO    opendrift.models.basemodel.environment:232:    sea_floor_depth_below_sea_level: 10000.000000

Running model backwards from end of forward simulation

o.run(steps=50*4, time_step=-900, time_step_output=3600)

17:15:29 INFO    opendrift:1732: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False]
17:15:29 INFO    opendrift:1732: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False]
17:15:29 INFO    opendrift:1743: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:15:29 INFO    opendrift:1743: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:15:29 INFO    opendrift:1751: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True]
17:15:29 INFO    opendrift:1794: Backwards simulation, starting from last seeded element
17:15:29 INFO    opendrift:1884: Backwards simulation, starting at time of last seeded element
17:15:29 INFO    opendrift:899: Using existing reader for land_binary_mask
17:15:29 INFO    opendrift:928: All points are in ocean
17:15:29 INFO    opendrift:2035: 2015-11-18 02:00:00 - step 1 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 01:45:00 - step 2 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 01:30:00 - step 3 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 01:15:00 - step 4 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 01:00:00 - step 5 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 00:45:00 - step 6 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 00:30:00 - step 7 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 00:15:00 - step 8 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-18 00:00:00 - step 9 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 23:45:00 - step 10 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 23:30:00 - step 11 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 23:15:00 - step 12 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 23:00:00 - step 13 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 22:45:00 - step 14 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 22:30:00 - step 15 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 22:15:00 - step 16 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 22:00:00 - step 17 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 21:45:00 - step 18 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 21:30:00 - step 19 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 21:15:00 - step 20 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 21:00:00 - step 21 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 20:45:00 - step 22 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 20:30:00 - step 23 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 20:15:00 - step 24 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 20:00:00 - step 25 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 19:45:00 - step 26 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 19:30:00 - step 27 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 19:15:00 - step 28 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 19:00:00 - step 29 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 18:45:00 - step 30 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 18:30:00 - step 31 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 18:15:00 - step 32 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 18:00:00 - step 33 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 17:45:00 - step 34 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 17:30:00 - step 35 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 17:15:00 - step 36 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 17:00:00 - step 37 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 16:45:00 - step 38 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 16:30:00 - step 39 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 16:15:00 - step 40 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 16:00:00 - step 41 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 15:45:00 - step 42 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 15:30:00 - step 43 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 15:15:00 - step 44 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 15:00:00 - step 45 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 14:45:00 - step 46 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 14:30:00 - step 47 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 14:15:00 - step 48 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 14:00:00 - step 49 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 13:45:00 - step 50 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 13:30:00 - step 51 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 13:15:00 - step 52 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 13:00:00 - step 53 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 12:45:00 - step 54 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 12:30:00 - step 55 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 12:15:00 - step 56 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 12:00:00 - step 57 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 11:45:00 - step 58 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 11:30:00 - step 59 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 11:15:00 - step 60 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 11:00:00 - step 61 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 10:45:00 - step 62 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 10:30:00 - step 63 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 10:15:00 - step 64 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 10:00:00 - step 65 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 09:45:00 - step 66 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 09:30:00 - step 67 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 09:15:00 - step 68 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 09:00:00 - step 69 of 200 - 100 active elements (0 deactivated)
17:15:29 INFO    opendrift:2035: 2015-11-17 08:45:00 - step 70 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 08:30:00 - step 71 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 08:15:00 - step 72 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 08:00:00 - step 73 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 07:45:00 - step 74 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 07:30:00 - step 75 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 07:15:00 - step 76 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 07:00:00 - step 77 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 06:45:00 - step 78 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 06:30:00 - step 79 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 06:15:00 - step 80 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 06:00:00 - step 81 of 200 - 100 active elements (0 deactivated)
17:15:30 INFO    opendrift:2035: 2015-11-17 05:45:00 - step 82 of 200 - 100 active elements (0 deactivated)
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17:15:31 INFO    opendrift:2035: 2015-11-16 00:15:00 - step 200 of 200 - 100 active elements (0 deactivated)

<xarray.Dataset> Size: 430kB
Dimensions:                                   (trajectory: 100, time: 51)
Coordinates:
  * trajectory                                (trajectory) int64 800B 0 1 ... 99
  * time                                      (time) datetime64[ns] 408B 2015...
Data variables: (12/21)
    status                                    (trajectory, time) float32 20kB ...
    moving                                    (trajectory, time) float32 20kB ...
    age_seconds                               (trajectory, time) float32 20kB ...
    origin_marker                             (trajectory, time) float32 20kB ...
    lon                                       (trajectory, time) float32 20kB ...
    lat                                       (trajectory, time) float32 20kB ...
    ...                                        ...
    upward_sea_water_velocity                 (trajectory, time) float32 20kB ...
    sea_surface_wave_significant_height       (trajectory, time) float32 20kB ...
    sea_surface_wave_stokes_drift_x_velocity  (trajectory, time) float32 20kB ...
    sea_surface_wave_stokes_drift_y_velocity  (trajectory, time) float32 20kB ...
    sea_floor_depth_below_sea_level           (trajectory, time) float32 20kB ...
    land_binary_mask                          (trajectory, time) float32 20kB ...
Attributes: (12/119)
    Conventions:                                                           CF...
    standard_name_vocabulary:                                              CF...
    featureType:                                                           tr...
    title:                                                                 Op...
    summary:                                                               Ou...
    keywords:                                                              tr...
    ...                                                                    ...
    geospatial_lon_units:                                                  de...
    geospatial_lon_resolution:                                             point
    runtime:                                                               0:...
    geospatial_vertical_min:                                               0.0
    geospatial_vertical_max:                                               0.0
    geospatial_vertical_positive:                                          up

xarray.Dataset

• Dimensions:
  • trajectory: 100
  • time: 51
• Coordinates: (2)
  • trajectory
    (trajectory)
    int64
    0 1 2 3 4 5 6 ... 94 95 96 97 98 99

    cf_role :

    trajectory_id

    dtype :

    <class 'numpy.int32'>

    array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
           18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
           36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
           54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
           72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
           90, 91, 92, 93, 94, 95, 96, 97, 98, 99])

  • time
    (time)
    datetime64[ns]
    2015-11-18T02:00:00 ... 2015-11-16

    standard_name :

    time

    long_name :

    time

    dtype :

    <class 'numpy.float64'>

    array(['2015-11-18T02:00:00.000000000', '2015-11-18T01:00:00.000000000',
           '2015-11-18T00:00:00.000000000', '2015-11-17T23:00:00.000000000',
           '2015-11-17T22:00:00.000000000', '2015-11-17T21:00:00.000000000',
           '2015-11-17T20:00:00.000000000', '2015-11-17T19:00:00.000000000',
           '2015-11-17T18:00:00.000000000', '2015-11-17T17:00:00.000000000',
           '2015-11-17T16:00:00.000000000', '2015-11-17T15:00:00.000000000',
           '2015-11-17T14:00:00.000000000', '2015-11-17T13:00:00.000000000',
           '2015-11-17T12:00:00.000000000', '2015-11-17T11:00:00.000000000',
           '2015-11-17T10:00:00.000000000', '2015-11-17T09:00:00.000000000',
           '2015-11-17T08:00:00.000000000', '2015-11-17T07:00:00.000000000',
           '2015-11-17T06:00:00.000000000', '2015-11-17T05:00:00.000000000',
           '2015-11-17T04:00:00.000000000', '2015-11-17T03:00:00.000000000',
           '2015-11-17T02:00:00.000000000', '2015-11-17T01:00:00.000000000',
           '2015-11-17T00:00:00.000000000', '2015-11-16T23:00:00.000000000',
           '2015-11-16T22:00:00.000000000', '2015-11-16T21:00:00.000000000',
           '2015-11-16T20:00:00.000000000', '2015-11-16T19:00:00.000000000',
           '2015-11-16T18:00:00.000000000', '2015-11-16T17:00:00.000000000',
           '2015-11-16T16:00:00.000000000', '2015-11-16T15:00:00.000000000',
           '2015-11-16T14:00:00.000000000', '2015-11-16T13:00:00.000000000',
           '2015-11-16T12:00:00.000000000', '2015-11-16T11:00:00.000000000',
           '2015-11-16T10:00:00.000000000', '2015-11-16T09:00:00.000000000',
           '2015-11-16T08:00:00.000000000', '2015-11-16T07:00:00.000000000',
           '2015-11-16T06:00:00.000000000', '2015-11-16T05:00:00.000000000',
           '2015-11-16T04:00:00.000000000', '2015-11-16T03:00:00.000000000',
           '2015-11-16T02:00:00.000000000', '2015-11-16T01:00:00.000000000',
           '2015-11-16T00:00:00.000000000'], dtype='datetime64[ns]')

• Data variables: (21)
  • status
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    dtype :

    <class 'numpy.int32'>

    valid_range :

    [0 0]

    flag_values :

    [0]

    flag_meanings :

    active

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • moving
    (trajectory, time)
    float32
    1.0 1.0 1.0 1.0 ... 1.0 1.0 1.0 1.0

    dtype :

    <class 'numpy.int32'>

    minval :

    1

    maxval :

    1

    array([[1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           ...,
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.]], shape=(100, 51), dtype=float32)

  • age_seconds
    (trajectory, time)
    float32
    1.8e+05 1.764e+05 ... 3.6e+03 0.0

    dtype :

    <class 'numpy.float32'>

    units :

    s

    minval :

    0.0

    maxval :

    180000.0

    array([[180000., 176400., 172800., ...,   7200.,   3600.,      0.],
           [180000., 176400., 172800., ...,   7200.,   3600.,      0.],
           [180000., 176400., 172800., ...,   7200.,   3600.,      0.],
           ...,
           [180000., 176400., 172800., ...,   7200.,   3600.,      0.],
           [180000., 176400., 172800., ...,   7200.,   3600.,      0.],
           [180000., 176400., 172800., ...,   7200.,   3600.,      0.]],
          shape=(100, 51), dtype=float32)

  • origin_marker
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    dtype :

    <class 'numpy.int32'>

    unit :

    description :

    An integer kept constant during the simulation. Different values may be used for different seedings, to separate elements during analysis. With GUI, only a single seeding is possible.

    minval :

    0

    maxval :

    0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • lon
    (trajectory, time)
    float32
    4.459 4.451 4.441 ... 4.228 4.233

    dtype :

    <class 'numpy.float32'>

    units :

    degrees_east

    standard_name :

    longitude

    long_name :

    longitude

    axis :

    X

    minval :

    4.0865855

    maxval :

    4.5469646

    array([[4.4594417, 4.451357 , 4.440672 , ..., 4.181996 , 4.1922755,
            4.2005305],
           [4.468392 , 4.4596252, 4.4471235, ..., 4.17898  , 4.188796 ,
            4.1968   ],
           [4.4567294, 4.448068 , 4.439885 , ..., 4.253678 , 4.2615786,
            4.2645135],
           ...,
           [4.509183 , 4.503112 , 4.499967 , ..., 4.31203  , 4.3141274,
            4.312383 ],
           [4.509123 , 4.5029902, 4.499408 , ..., 4.300793 , 4.303296 ,
            4.302155 ],
           [4.4503913, 4.4430776, 4.434445 , ..., 4.21887  , 4.2283163,
            4.232622 ]], shape=(100, 51), dtype=float32)

  • lat
    (trajectory, time)
    float32
    60.6 60.59 60.57 ... 60.11 60.11

    dtype :

    <class 'numpy.float32'>

    units :

    degrees_north

    standard_name :

    latitude

    long_name :

    latitude

    axis :

    Y

    minval :

    59.96719

    maxval :

    60.687393

    array([[60.60412 , 60.59003 , 60.57125 , ..., 60.11559 , 60.11133 ,
            60.10901 ],
           [60.594307, 60.58077 , 60.56227 , ..., 60.12406 , 60.11976 ,
            60.117214],
           [60.641304, 60.622135, 60.60009 , ..., 60.136257, 60.13002 ,
            60.126102],
           ...,
           [60.686253, 60.661747, 60.632896, ..., 60.13543 , 60.12777 ,
            60.121754],
           [60.684784, 60.66032 , 60.63177 , ..., 60.135582, 60.128105,
            60.12232 ],
           [60.62711 , 60.61058 , 60.590458, ..., 60.11753 , 60.112057,
            60.10934 ]], shape=(100, 51), dtype=float32)

  • z
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    dtype :

    <class 'numpy.float32'>

    units :

    m

    standard_name :

    z

    long_name :

    vertical position

    axis :

    Z

    positive :

    up

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • wind_drift_factor
    (trajectory, time)
    float32
    0.02 0.02 0.02 ... 0.02 0.02 0.02

    dtype :

    <class 'numpy.float32'>

    units :

    1

    description :

    Elements at surface are moved with this fraction of the vind vector, in addition to currents and Stokes drift

    minval :

    0.02

    maxval :

    0.02

    array([[0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02],
           [0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02],
           [0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02],
           ...,
           [0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02],
           [0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02],
           [0.02, 0.02, 0.02, ..., 0.02, 0.02, 0.02]],
          shape=(100, 51), dtype=float32)

  • current_drift_factor
    (trajectory, time)
    float32
    1.0 1.0 1.0 1.0 ... 1.0 1.0 1.0 1.0

    dtype :

    <class 'numpy.float32'>

    units :

    1

    description :

    Elements are moved with this fraction of the current vector, in addition to currents and Stokes drift

    minval :

    1.0

    maxval :

    1.0

    array([[1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           ...,
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.],
           [1., 1., 1., ..., 1., 1., 1.]], shape=(100, 51), dtype=float32)

  • terminal_velocity
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    dtype :

    <class 'numpy.float32'>

    units :

    m/s

    description :

    Terminal rise/sinking velocity (buoyancy) in the ocean column

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • x_sea_water_velocity
    (trajectory, time)
    float32
    0.1045 0.1658 ... -0.1009 -0.03256

    minval :

    -0.37766287

    maxval :

    0.58533806

    array([[ 0.10453686,  0.1657795 ,  0.15654744, ..., -0.16697897,
            -0.14287856, -0.1110128 ],
           [ 0.09998465,  0.18665405,  0.19127567, ..., -0.1574865 ,
            -0.13744646, -0.10923743],
           [ 0.13697557,  0.1186516 ,  0.08687087, ..., -0.15191773,
            -0.07422473, -0.01658644],
           ...,
           [ 0.11896275,  0.07293303,  0.03638253, ..., -0.04966858,
            -0.00379893,  0.05595096],
           [ 0.12007549,  0.07793832,  0.04453543, ..., -0.05461824,
            -0.01213783,  0.04546927],
           [ 0.09769081,  0.1372354 ,  0.10741613, ..., -0.1739134 ,
            -0.1008761 , -0.03255628]], shape=(100, 51), dtype=float32)

  • y_sea_water_velocity
    (trajectory, time)
    float32
    0.3825 0.5317 ... 0.08716 0.08159

    minval :

    -0.53807026

    maxval :

    0.9253159

    array([[0.38248244, 0.53165585, 0.66935813, ..., 0.16553713, 0.07175291,
            0.07153998],
           [0.34388354, 0.5066932 , 0.6657458 , ..., 0.15265985, 0.08573855,
            0.07228957],
           [0.5480871 , 0.643944  , 0.7459694 , ..., 0.2376696 , 0.11877437,
            0.12444859],
           ...,
           [0.6631839 , 0.85955995, 0.90085256, ..., 0.27057773, 0.18785371,
            0.18662705],
           [0.6550375 , 0.847548  , 0.89133054, ..., 0.26649344, 0.18010661,
            0.17958996],
           [0.479661  , 0.58136624, 0.71653956, ..., 0.21798179, 0.08715536,
            0.08158504]], shape=(100, 51), dtype=float32)

  • sea_surface_height
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • x_wind
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • y_wind
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • upward_sea_water_velocity
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • sea_surface_wave_significant_height
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • sea_surface_wave_stokes_drift_x_velocity
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • sea_surface_wave_stokes_drift_y_velocity
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

  • sea_floor_depth_below_sea_level
    (trajectory, time)
    float32
    1e+04 1e+04 1e+04 ... 1e+04 1e+04

    minval :

    10000.0

    maxval :

    10000.0

    array([[10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           ...,
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.],
           [10000., 10000., 10000., ..., 10000., 10000., 10000.]],
          shape=(100, 51), dtype=float32)

  • land_binary_mask
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... 0.0 0.0 0.0 0.0

    minval :

    0.0

    maxval :

    0.0

    array([[0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           ...,
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.],
           [0., 0., 0., ..., 0., 0., 0.]], shape=(100, 51), dtype=float32)

• Indexes: (2)
  • trajectory
    PandasIndex

    PandasIndex(Index([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
           18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
           36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
           54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
           72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
           90, 91, 92, 93, 94, 95, 96, 97, 98, 99],
          dtype='int64', name='trajectory'))

  • time
    PandasIndex

    PandasIndex(DatetimeIndex(['2015-11-18 02:00:00', '2015-11-18 01:00:00',
                   '2015-11-18 00:00:00', '2015-11-17 23:00:00',
                   '2015-11-17 22:00:00', '2015-11-17 21:00:00',
                   '2015-11-17 20:00:00', '2015-11-17 19:00:00',
                   '2015-11-17 18:00:00', '2015-11-17 17:00:00',
                   '2015-11-17 16:00:00', '2015-11-17 15:00:00',
                   '2015-11-17 14:00:00', '2015-11-17 13:00:00',
                   '2015-11-17 12:00:00', '2015-11-17 11:00:00',
                   '2015-11-17 10:00:00', '2015-11-17 09:00:00',
                   '2015-11-17 08:00:00', '2015-11-17 07:00:00',
                   '2015-11-17 06:00:00', '2015-11-17 05:00:00',
                   '2015-11-17 04:00:00', '2015-11-17 03:00:00',
                   '2015-11-17 02:00:00', '2015-11-17 01:00:00',
                   '2015-11-17 00:00:00', '2015-11-16 23:00:00',
                   '2015-11-16 22:00:00', '2015-11-16 21:00:00',
                   '2015-11-16 20:00:00', '2015-11-16 19:00:00',
                   '2015-11-16 18:00:00', '2015-11-16 17:00:00',
                   '2015-11-16 16:00:00', '2015-11-16 15:00:00',
                   '2015-11-16 14:00:00', '2015-11-16 13:00:00',
                   '2015-11-16 12:00:00', '2015-11-16 11:00:00',
                   '2015-11-16 10:00:00', '2015-11-16 09:00:00',
                   '2015-11-16 08:00:00', '2015-11-16 07:00:00',
                   '2015-11-16 06:00:00', '2015-11-16 05:00:00',
                   '2015-11-16 04:00:00', '2015-11-16 03:00:00',
                   '2015-11-16 02:00:00', '2015-11-16 01:00:00',
                   '2015-11-16 00:00:00'],
                  dtype='datetime64[ns]', name='time', freq='-1h'))

• Attributes: (119)

  Conventions :

  CF-1.11, ACDD-1.3

  standard_name_vocabulary :

  CF Standard Name Table v85

  featureType :

  trajectory

  title :

  OpenDrift trajectory simulation

  summary :

  Output from simulation with OpenDrift framework

  keywords :

  trajectory, drift, lagrangian, simulation

  history :

  Created 2025-07-11 17:15:29.172235

  date_created :

  2025-07-11T17:15:29.172243

  source :

  Output from simulation with OpenDrift

  model_url :

  https://github.com/OpenDrift/opendrift

  opendrift_class :

  OceanDrift

  opendrift_module :

  opendrift.models.oceandrift

  readers :

  odict_keys(['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc', 'global_landmask'])

  time_coverage_start :

  2015-11-18 02:00:00

  time_step_calculation :

  -1 day, 23:45:00

  time_step_output :

  -1 day, 23:00:00

  config_environment:constant:x_sea_water_velocity :

  None

  config_environment:fallback:x_sea_water_velocity :

  0

  config_environment:constant:y_sea_water_velocity :

  None

  config_environment:fallback:y_sea_water_velocity :

  0

  config_environment:constant:sea_surface_height :

  None

  config_environment:fallback:sea_surface_height :

  0

  config_environment:constant:x_wind :

  None

  config_environment:fallback:x_wind :

  0

  config_environment:constant:y_wind :

  None

  config_environment:fallback:y_wind :

  0

  config_environment:constant:upward_sea_water_velocity :

  None

  config_environment:fallback:upward_sea_water_velocity :

  0

  config_environment:constant:ocean_vertical_diffusivity :

  None

  config_environment:fallback:ocean_vertical_diffusivity :

  0

  config_environment:constant:sea_surface_wave_significant_height :

  None

  config_environment:fallback:sea_surface_wave_significant_height :

  0

  config_environment:constant:sea_surface_wave_stokes_drift_x_velocity :

  None

  config_environment:fallback:sea_surface_wave_stokes_drift_x_velocity :

  0

  config_environment:constant:sea_surface_wave_stokes_drift_y_velocity :

  None

  config_environment:fallback:sea_surface_wave_stokes_drift_y_velocity :

  0

  config_environment:constant:ocean_mixed_layer_thickness :

  None

  config_environment:fallback:ocean_mixed_layer_thickness :

  50

  config_environment:constant:sea_floor_depth_below_sea_level :

  None

  config_environment:fallback:sea_floor_depth_below_sea_level :

  10000

  config_environment:constant:land_binary_mask :

  None

  config_environment:fallback:land_binary_mask :

  0.0

  config_general:use_auto_landmask :

  True

  config_drift:current_uncertainty :

  0

  config_drift:current_uncertainty_uniform :

  0

  config_drift:max_speed :

  2.0

  config_readers:max_number_of_fails :

  1

  config_general:simulation_name :

  config_general:coastline_action :

  stranding

  config_general:coastline_approximation_precision :

  0.001

  config_general:time_step_minutes :

  60

  config_general:time_step_output_minutes :

  None

  config_seed:ocean_only :

  True

  config_seed:number :

  1

  config_drift:max_age_seconds :

  None

  config_drift:advection_scheme :

  euler

  config_drift:horizontal_diffusivity :

  0

  config_drift:profiles_depth :

  50

  config_drift:wind_uncertainty :

  0

  config_drift:relative_wind :

  False

  config_drift:deactivate_north_of :

  None

  config_drift:deactivate_south_of :

  None

  config_drift:deactivate_east_of :

  None

  config_drift:deactivate_west_of :

  None

  config_seed:origin_marker :

  0

  config_seed:z :

  0

  config_seed:wind_drift_factor :

  0.02

  config_seed:current_drift_factor :

  1

  config_seed:terminal_velocity :

  0.0

  config_drift:vertical_advection :

  True

  config_drift:vertical_advection_at_surface :

  False

  config_drift:water_column_stretching :

  False

  config_drift:vertical_advection_correction :

  False

  config_drift:vertical_mixing :

  False

  config_drift:vertical_mixing_at_surface :

  False

  config_vertical_mixing:timestep :

  60

  config_vertical_mixing:diffusivitymodel :

  environment

  config_vertical_mixing:background_diffusivity :

  1.2e-05

  config_vertical_mixing:TSprofiles :

  False

  config_drift:wind_drift_depth :

  0.1

  config_drift:stokes_drift :

  True

  config_drift:stokes_drift_profile :

  Phillips

  config_drift:use_tabularised_stokes_drift :

  False

  config_drift:tabularised_stokes_drift_fetch :

  25000

  config_general:seafloor_action :

  lift_to_seafloor

  config_drift:truncate_ocean_model_below_m :

  None

  config_seed:seafloor :

  False

  opendrift_version :

  1.14.2

  seed_geojson :

  {"features": [], "type": "FeatureCollection"}

  simulation_time :

  2025-07-11 17:15:29.175356

  reader_x_sea_water_velocity :

  ['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc']

  reader_y_sea_water_velocity :

  ['/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc']

  reader_sea_surface_height :

  0

  reader_x_wind :

  0

  reader_y_wind :

  0

  reader_upward_sea_water_velocity :

  0

  reader_sea_surface_wave_significant_height :

  0

  reader_sea_surface_wave_stokes_drift_x_velocity :

  0

  reader_sea_surface_wave_stokes_drift_y_velocity :

  0

  reader_sea_floor_depth_below_sea_level :

  10000

  reader_land_binary_mask :

  ['global_landmask']

  time_coverage_end :

  2015-11-16 00:00:00

  time_coverage_duration :

  P-3DT22H0M0S

  time_coverage_resolution :

  P-1DT23H45M0S

  performance :

  -------------------- Reader performance: -------------------- /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc 0:00:00.9 total 0:00:00.0 preparing 0:00:00.4 reading 0:00:00.0 interpolation 0:00:00.0 interpolation_time 0:00:00.4 rotating vectors 0:00:00.0 masking -------------------- global_landmask 0:00:00.0 total 0:00:00.0 preparing 0:00:00.0 reading 0:00:00.0 masking -------------------- Performance: 3.1 total time 0.7 configuration 0.0 preparing main loop 0.0 moving elements to ocean 2.3 main loop 0.0 updating elements 0.0 cleaning up --------------------

  geospatial_bounds_crs :

  EPSG:4326

  geospatial_bounds_vertical_crs :

  EPSG:5831

  geospatial_lat_min :

  59.96719

  geospatial_lat_max :

  60.687393

  geospatial_lat_units :

  degrees_north

  geospatial_lat_resolution :

  point

  geospatial_lon_min :

  4.0865855

  geospatial_lon_max :

  4.5469646

  geospatial_lon_units :

  degrees_east

  geospatial_lon_resolution :

  point

  runtime :

  0:00:03.180283

  geospatial_vertical_min :

  0.0

  geospatial_vertical_max :

  0.0

  geospatial_vertical_positive :

  up

Check if backwards simulation brings elements back to their starting position. Some numerical error is expected.

print(o)
o.plot(buffer=.2, fast=True)
os.remove(ncfile)

##%%
# Compare plots forward and backward

===========================
--------------------
Reader performance:
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
 0:00:00.9  total
 0:00:00.0  preparing
 0:00:00.4  reading
 0:00:00.0  interpolation
 0:00:00.0  interpolation_time
 0:00:00.4  rotating vectors
 0:00:00.0  masking
--------------------
global_landmask
 0:00:00.0  total
 0:00:00.0  preparing
 0:00:00.0  reading
 0:00:00.0  masking
--------------------
Performance:
    3.1 total time
    0.7 configuration
    0.0 preparing main loop
      0.0 moving elements to ocean
    2.3 main loop
      0.0 updating elements
    0.0 cleaning up
--------------------
===========================
Model:  OceanDrift     (OpenDrift version 1.14.2)
        100 active Lagrangian3DArray particles  (0 deactivated, 0 scheduled)
-------------------
Environment variables:
  -----
  x_sea_water_velocity
  y_sea_water_velocity
     1) /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
  -----
  land_binary_mask
     1) global_landmask
  -----
Readers not added for the following variables:
  sea_floor_depth_below_sea_level
  sea_surface_height
  sea_surface_wave_significant_height
  sea_surface_wave_stokes_drift_x_velocity
  sea_surface_wave_stokes_drift_y_velocity
  upward_sea_water_velocity
  x_wind
  y_wind

Discarded readers:

Time:
        Start: 2015-11-18 02:00:00 UTC
        Present: 2015-11-16 00:00:00 UTC
        Calculation steps: 200 * -1 day, 23:45:00 - total time: -3 days, 22:00:00
        Output steps: 51 * -1 day, 23:00:00
===========================

17:15:31 WARNING opendrift:2391: Plotting fast. This will make your plots less accurate.