Grid

import numpy as np
from opendrift import test_data_folder as tdf
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.oceandrift import OceanDrift

o = OceanDrift(loglevel=20)  # Set loglevel to 0 for debug information

# Norkyst
reader_norkyst = reader_netCDF_CF_generic.Reader(tdf + '16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')

o.add_reader(reader_norkyst)
#o.set_config('environment:fallback:land_binary_mask', 0)
o.set_config('drift:vertical_mixing', False)

13:58:10 INFO    opendrift:569: OpenDriftSimulation initialised (version 1.14.11 / v1.14.12-9-g6f1a4a0)
13:58:10 INFO    opendrift.readers:67: Opening file with xr.open_dataset
13:58:10 INFO    opendrift.readers.reader_netCDF_CF_generic:340: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}

Seeding some particles

lons = np.linspace(3.5, 5.0, 100)
lats = np.linspace(60, 61, 100)
lons, lats = np.meshgrid(lons, lats)
lons = lons.ravel()
lats = lats.ravel()
o.seed_elements(lons, lats, radius=0, number=10000,
                time=reader_norkyst.start_time)

13:58:10 INFO    opendrift.models.basemodel.environment:203: Adding a global landmask from GSHHG
13:58:17 INFO    opendrift.models.basemodel.environment:227: Fallback values will be used for the following variables which have no readers:
13:58:17 INFO    opendrift.models.basemodel.environment:230:    sea_surface_height: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    x_wind: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    y_wind: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    upward_sea_water_velocity: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    ocean_vertical_diffusivity: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    horizontal_diffusivity: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_significant_height: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    ocean_mixed_layer_thickness: 50.000000
13:58:17 INFO    opendrift.models.basemodel.environment:230:    sea_floor_depth_below_sea_level: 10000.000000

Running model

o.run(steps=60*2, time_step=1800, time_step_output=1800)

13:58:17 INFO    opendrift:1910: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False]
13:58:17 INFO    opendrift:1910: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False]
13:58:17 INFO    opendrift:1921: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
13:58:17 INFO    opendrift:1921: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
13:58:17 INFO    opendrift:1929: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True]
13:58:17 INFO    opendrift:958: Using existing reader for land_binary_mask to move elements to ocean
13:58:17 INFO    opendrift:991: Moving 469 out of 10000 points from land to water
13:58:17 INFO    opendrift:2237: 2015-11-16 00:00:00 - step 1 of 120 - 10000 active elements (0 deactivated)
13:58:17 INFO    opendrift:2237: 2015-11-16 00:30:00 - step 2 of 120 - 10000 active elements (0 deactivated)
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<xarray.Dataset> Size: 107MB
Dimensions:                                   (trajectory: 10000, time: 121)
Coordinates:
  * trajectory                                (trajectory) int64 80kB 0 ... 9999
  * time                                      (time) datetime64[ns] 968B 2015...
Data variables: (12/22)
    status                                    (trajectory, time) float32 5MB ...
    moving                                    (trajectory, time) float32 5MB ...
    age_seconds                               (trajectory, time) float32 5MB ...
    origin_marker                             (trajectory, time) float32 5MB ...
    lon                                       (trajectory, time) float32 5MB ...
    lat                                       (trajectory, time) float32 5MB ...
    ...                                        ...
    horizontal_diffusivity                    (trajectory, time) float32 5MB ...
    sea_surface_wave_significant_height       (trajectory, time) float32 5MB ...
    sea_surface_wave_stokes_drift_x_velocity  (trajectory, time) float32 5MB ...
    sea_surface_wave_stokes_drift_y_velocity  (trajectory, time) float32 5MB ...
    sea_floor_depth_below_sea_level           (trajectory, time) float32 5MB ...
    land_binary_mask                          (trajectory, time) float32 5MB ...
Attributes: (12/121)
    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: 10000
  • time: 121
• Coordinates: (2)
  • trajectory
    (trajectory)
    int64
    0 1 2 3 4 ... 9996 9997 9998 9999

    cf_role :

    trajectory_id

    dtype :

    <class 'numpy.int32'>

    array([   0,    1,    2, ..., 9997, 9998, 9999], shape=(10000,))

  • time
    (time)
    datetime64[ns]
    2015-11-16 ... 2015-11-18T12:00:00

    standard_name :

    time

    long_name :

    time

    dtype :

    <class 'numpy.float64'>

    array(['2015-11-16T00:00:00.000000000', '2015-11-16T00:30:00.000000000',
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           '2015-11-17T07:00:00.000000000', '2015-11-17T07:30:00.000000000',
           '2015-11-17T08:00:00.000000000', '2015-11-17T08:30:00.000000000',
           '2015-11-17T09:00:00.000000000', '2015-11-17T09:30:00.000000000',
           '2015-11-17T10:00:00.000000000', '2015-11-17T10:30:00.000000000',
           '2015-11-17T11:00:00.000000000', '2015-11-17T11:30:00.000000000',
           '2015-11-17T12:00:00.000000000', '2015-11-17T12:30:00.000000000',
           '2015-11-17T13:00:00.000000000', '2015-11-17T13:30:00.000000000',
           '2015-11-17T14:00:00.000000000', '2015-11-17T14:30:00.000000000',
           '2015-11-17T15:00:00.000000000', '2015-11-17T15:30:00.000000000',
           '2015-11-17T16:00:00.000000000', '2015-11-17T16:30:00.000000000',
           '2015-11-17T17:00:00.000000000', '2015-11-17T17:30:00.000000000',
           '2015-11-17T18:00:00.000000000', '2015-11-17T18:30:00.000000000',
           '2015-11-17T19:00:00.000000000', '2015-11-17T19:30:00.000000000',
           '2015-11-17T20:00:00.000000000', '2015-11-17T20:30:00.000000000',
           '2015-11-17T21:00:00.000000000', '2015-11-17T21:30:00.000000000',
           '2015-11-17T22:00:00.000000000', '2015-11-17T22:30:00.000000000',
           '2015-11-17T23:00:00.000000000', '2015-11-17T23:30:00.000000000',
           '2015-11-18T00:00:00.000000000', '2015-11-18T00:30:00.000000000',
           '2015-11-18T01:00:00.000000000', '2015-11-18T01:30:00.000000000',
           '2015-11-18T02:00:00.000000000', '2015-11-18T02:30:00.000000000',
           '2015-11-18T03:00:00.000000000', '2015-11-18T03:30:00.000000000',
           '2015-11-18T04:00:00.000000000', '2015-11-18T04:30:00.000000000',
           '2015-11-18T05:00:00.000000000', '2015-11-18T05:30:00.000000000',
           '2015-11-18T06:00:00.000000000', '2015-11-18T06:30:00.000000000',
           '2015-11-18T07:00:00.000000000', '2015-11-18T07:30:00.000000000',
           '2015-11-18T08:00:00.000000000', '2015-11-18T08:30:00.000000000',
           '2015-11-18T09:00:00.000000000', '2015-11-18T09:30:00.000000000',
           '2015-11-18T10:00:00.000000000', '2015-11-18T10:30:00.000000000',
           '2015-11-18T11:00:00.000000000', '2015-11-18T11:30:00.000000000',
           '2015-11-18T12:00:00.000000000'], dtype='datetime64[ns]')

• Data variables: (22)
  • status
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... nan nan nan nan

    dtype :

    <class 'numpy.int32'>

    valid_range :

    [0 1]

    flag_values :

    [0 1]

    flag_meanings :

    active stranded

    array([[ 0.,  0.,  0., ...,  0.,  0.,  0.],
           [ 0.,  0.,  0., ...,  0.,  0.,  0.],
           [ 0.,  0.,  0., ...,  0.,  0.,  0.],
           ...,
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    dtype :

    <class 'numpy.int32'>

    minval :

    0

    maxval :

    1

    array([[ 1.,  1.,  1., ...,  1.,  1.,  1.],
           [ 1.,  1.,  1., ...,  1.,  1.,  1.],
           [ 1.,  1.,  1., ...,  1.,  1.,  1.],
           ...,
           [ 1.,  1.,  1., ..., nan, nan, nan],
           [ 1.,  1.,  1., ..., nan, nan, nan],
           [ 1.,  1.,  1., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    dtype :

    <class 'numpy.float32'>

    units :

    s

    minval :

    0.0

    maxval :

    216000.0

    array([[     0.,   1800.,   3600., ..., 212400., 214200., 216000.],
           [     0.,   1800.,   3600., ..., 212400., 214200., 216000.],
           [     0.,   1800.,   3600., ..., 212400., 214200., 216000.],
           ...,
           [     0.,   1800.,   3600., ...,     nan,     nan,     nan],
           [     0.,   1800.,   3600., ...,     nan,     nan,     nan],
           [     0.,   1800.,   3600., ...,     nan,     nan,     nan]],
          shape=(10000, 121), dtype=float32)

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

    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.

    flag_values :

    [0]

    flag_meanings :

    Seed_0

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

  • lon
    (trajectory, time)
    float32
    3.5 3.5 3.5 3.501 ... nan nan nan

    dtype :

    <class 'numpy.float32'>

    units :

    degrees_east

    standard_name :

    longitude

    long_name :

    longitude

    axis :

    X

    minval :

    3.381036

    maxval :

    5.03062

    array([[3.5      , 3.4998097, 3.5000215, ..., 3.8482792, 3.8444703,
            3.8421087],
           [3.5151515, 3.5161066, 3.5172787, ..., 3.931067 , 3.9374778,
            3.9440227],
           [3.530303 , 3.531278 , 3.5321033, ..., 3.9714332, 3.9774756,
            3.9841278],
           ...,
           [4.97     , 4.961941 , 4.9546723, ...,       nan,       nan,
                  nan],
           [4.98     , 4.9739823, 4.965662 , ...,       nan,       nan,
                  nan],
           [5.       , 4.9943767, 4.986925 , ...,       nan,       nan,
                  nan]], shape=(10000, 121), dtype=float32)

  • lat
    (trajectory, time)
    float32
    60.0 60.0 60.01 ... nan nan nan

    dtype :

    <class 'numpy.float32'>

    units :

    degrees_north

    standard_name :

    latitude

    long_name :

    latitude

    axis :

    Y

    minval :

    59.83706

    maxval :

    61.709366

    array([[60.      , 60.004395, 60.00905 , ..., 60.124043, 60.122852,
            60.12134 ],
           [60.      , 60.00431 , 60.00879 , ..., 60.072132, 60.070946,
            60.069736],
           [60.      , 60.003216, 60.006775, ..., 60.067017, 60.067986,
            60.06876 ],
           ...,
           [61.02    , 61.022602, 61.024635, ...,       nan,       nan,
                  nan],
           [61.02    , 61.024845, 61.02875 , ...,       nan,       nan,
                  nan],
           [61.02    , 61.025215, 61.030933, ...,       nan,       nan,
                  nan]], shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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, ...,  nan,  nan,  nan],
           [0.02, 0.02, 0.02, ...,  nan,  nan,  nan],
           [0.02, 0.02, 0.02, ...,  nan,  nan,  nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 1.,  1.,  1., ..., nan, nan, nan],
           [ 1.,  1.,  1., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

  • x_sea_water_velocity
    (trajectory, time)
    float32
    -0.005899 0.006561 ... nan nan

    minval :

    -1.0006603

    maxval :

    1.1290541

    array([[-0.00589851,  0.00656053,  0.0223668 , ..., -0.11763789,
            -0.07293712, -0.07293712],
           [ 0.02960387,  0.03632518,  0.04534073, ...,  0.19831052,
             0.20246439,  0.20246439],
           [ 0.03021681,  0.02558781,  0.02631653, ...,  0.1869265 ,
             0.20578817,  0.20578817],
           ...,
           [-0.24208021, -0.21832018, -0.236857  , ...,         nan,
                    nan,         nan],
           [-0.18074392, -0.24988174, -0.28203487, ...,         nan,
                    nan,         nan],
           [-0.16889517, -0.22377777, -0.19969031, ...,         nan,
                    nan,         nan]], shape=(10000, 121), dtype=float32)

  • y_sea_water_velocity
    (trajectory, time)
    float32
    0.2721 0.288 0.3034 ... nan nan nan

    minval :

    -0.7457974

    maxval :

    1.5152365

    array([[ 0.2721158 ,  0.28798285,  0.3033552 , ..., -0.07358317,
            -0.0934096 , -0.0934096 ],
           [ 0.2668752 ,  0.2772295 ,  0.28791857, ..., -0.07342021,
            -0.07488343, -0.07488343],
           [ 0.19906616,  0.22026607,  0.24014868, ...,  0.05997792,
             0.0479505 ,  0.0479505 ],
           ...,
           [ 0.16098984,  0.12609781,  0.11512434, ...,         nan,
                    nan,         nan],
           [ 0.29999855,  0.2417709 ,  0.20206916, ...,         nan,
                    nan,         nan],
           [ 0.32278198,  0.35406485,  0.35035717, ...,         nan,
                    nan,         nan]], shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

  • horizontal_diffusivity
    (trajectory, time)
    float32
    0.0 0.0 0.0 0.0 ... nan nan nan nan

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ...,    nan,    nan,    nan],
           [10000., 10000., 10000., ...,    nan,    nan,    nan],
           [10000., 10000., 10000., ...,    nan,    nan,    nan]],
          shape=(10000, 121), dtype=float32)

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

    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., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan],
           [ 0.,  0.,  0., ..., nan, nan, nan]],
          shape=(10000, 121), dtype=float32)

• Attributes: (121)

  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 2026-09-10 13:58:17.214566

  date_created :

  2026-09-10T13:58:17.214582

  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 :

  0:30:00

  time_step_output :

  0:30:00

  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:horizontal_diffusivity :

  None

  config_environment:fallback:horizontal_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 :

  None

  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: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 :

  1.14.11

  seed_geojson :

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

  simulation_time :

  2026-09-10 13:58:17.256476

  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_horizontal_diffusivity :

  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 12:00:00

  time_coverage_duration :

  P2DT12H0M0S

  time_coverage_resolution :

  P0DT0H30M0S

  performance :

  -------------------- Reader performance: -------------------- /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc 0:00:01.7 total 0:00:00.0 preparing 0:00:00.6 reading 0:00:00.4 interpolation 0:00:00.0 interpolation_time 0:00:01.0 rotating vectors 0:00:00.0 masking -------------------- global_landmask 0:00:00.2 total 0:00:00.0 preparing 0:00:00.2 reading 0:00:00.0 masking -------------------- Performance: 16.6 total time 6.8 configuration 0.0 preparing main loop 0.0 moving elements to ocean 9.7 main loop 0.5 updating elements 0.0 cleaning up --------------------

  geospatial_bounds_crs :

  EPSG:4326

  geospatial_bounds_vertical_crs :

  EPSG:5831

  geospatial_lat_min :

  59.83706

  geospatial_lat_max :

  61.709366

  geospatial_lat_units :

  degrees_north

  geospatial_lat_resolution :

  point

  geospatial_lon_min :

  3.381036

  geospatial_lon_max :

  5.03062

  geospatial_lon_units :

  degrees_east

  geospatial_lon_resolution :

  point

  runtime :

  0:00:16.647031

  geospatial_vertical_min :

  0.0

  geospatial_vertical_max :

  0.0

  geospatial_vertical_positive :

  up

Print and plot results

print(o)
o.animation(fast=False, corners=[3.5, 5.5, 59.9, 61.2])

===========================
--------------------
Reader performance:
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
 0:00:01.7  total
 0:00:00.0  preparing
 0:00:00.6  reading
 0:00:00.4  interpolation
 0:00:00.0  interpolation_time
 0:00:01.0  rotating vectors
 0:00:00.0  masking
--------------------
global_landmask
 0:00:00.2  total
 0:00:00.0  preparing
 0:00:00.2  reading
 0:00:00.0  masking
--------------------
Performance:
   16.6 total time
    6.8 configuration
    0.0 preparing main loop
      0.0 moving elements to ocean
    9.7 main loop
      0.5 updating elements
    0.0 cleaning up
--------------------
===========================
Model:  OceanDrift     (OpenDrift version 1.14.11)
        7649 active Lagrangian3DArray particles  (2351 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:
  horizontal_diffusivity
  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 12:00:00 UTC
        Calculation steps: 120 * 0:30:00 - total time: 2 days, 12:00:00
        Output steps: 121 * 0:30:00
===========================

13:58:39 INFO    opendrift:4823: Saving animation to /root/project/docs/source/gallery/animations/example_grid_0.gif...
13:59:27 INFO    opendrift:3241: Time to make animation: 0:01:00.016997