Show dominating source

import os
from datetime import datetime
import xarray as xr
import opendrift
from opendrift.models.oceandrift import OceanDrift

of = 'test.nc'

Seed elements at 5 different locations/longitudes

lons = [4, 4.2, 4.3, 4.32, 4.6]
t = datetime.now()

o = OceanDrift(loglevel=20)

for i, lon in enumerate(lons):
    o.seed_elements(lon=lon, lat=60, radius=3000, number=2000, time=t, origin_marker_name='Lon %f' % lon)
o.set_config('environment:constant:y_sea_water_velocity', .1)
o.run(steps=15, outfile=of)

14:02:08 INFO    opendrift.models.basemodel:539: OpenDriftSimulation initialised (version 1.10.7 / v1.10.6-119-g1da5bec)
14:02:08 INFO    opendrift.models.basemodel:2591: Fallback values will be used for the following variables which have no readers:
14:02:08 INFO    opendrift.models.basemodel:2594:       x_sea_water_velocity: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       x_wind: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       y_wind: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       upward_sea_water_velocity: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       ocean_vertical_diffusivity: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_significant_height: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_stokes_drift_x_velocity: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_stokes_drift_y_velocity: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_swell_wave_to_direction: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_swell_wave_significant_height: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wind_wave_to_direction: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wind_wave_mean_period: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_surface_wind_wave_significant_height: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       surface_downward_x_stress: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       surface_downward_y_stress: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       turbulent_kinetic_energy: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       turbulent_generic_length_scale: 0.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       ocean_mixed_layer_thickness: 50.000000
14:02:08 INFO    opendrift.models.basemodel:2594:       sea_floor_depth_below_sea_level: 10000.000000
14:02:08 INFO    opendrift.models.basemodel:2753: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1 m/s. Adding a customised landmask may be faster...
14:02:14 INFO    opendrift.models.basemodel:1701: Using existing reader for land_binary_mask
14:02:14 INFO    opendrift.models.basemodel:1713: All points are in ocean
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 14:02:08.280043 - step 1 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 15:02:08.280043 - step 2 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 16:02:08.280043 - step 3 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 17:02:08.280043 - step 4 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 18:02:08.280043 - step 5 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 19:02:08.280043 - step 6 of 15 - 10000 active elements (0 deactivated)
14:02:14 INFO    opendrift.models.basemodel:2882: 2023-09-01 20:02:08.280043 - step 7 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-01 21:02:08.280043 - step 8 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-01 22:02:08.280043 - step 9 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-01 23:02:08.280043 - step 10 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-02 00:02:08.280043 - step 11 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-02 01:02:08.280043 - step 12 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-02 02:02:08.280043 - step 13 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-02 03:02:08.280043 - step 14 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.models.basemodel:2882: 2023-09-02 04:02:08.280043 - step 15 of 15 - 10000 active elements (0 deactivated)
14:02:15 INFO    opendrift.export.io_netcdf:111: Wrote 16 steps to file test.nc
/opt/conda/envs/opendrift/lib/python3.11/site-packages/numpy/ma/core.py:467: RuntimeWarning: invalid value encountered in cast
  fill_value = np.array(fill_value, copy=False, dtype=ndtype)

Calculate spatial density of elements at 1500m grid spacing

oa = opendrift.open_xarray(of)
oa.ds = oa.ds.where(oa.ds.status==0)
d = oa.get_histogram(pixelsize_m=1500, weights=None)
dom = d.argmax(dim='origin_marker', skipna=True)
dom = dom.where(d.sum(dim='origin_marker')>0)
dom.name = 'Dominating source'

14:02:16 DEBUG   opendrift.models.basemodel:625: Adding 18 config items from basemodel
14:02:16 DEBUG   opendrift.models.basemodel:625: Adding 5 config items from basemodel
14:02:16 DEBUG   opendrift.models.basemodel:625: Adding 48 config items from basemodel
14:02:16 INFO    opendrift.models.basemodel:539: OpenDriftSimulation initialised (version 1.10.7 / v1.10.6-119-g1da5bec)
14:02:16 DEBUG   opendrift.models.basemodel:625: Adding 15 config items from oceandrift
14:02:16 DEBUG   opendrift.models.basemodel:637:   Overwriting config item seed:z
14:02:16 DEBUG   opendrift.export.io_netcdf:216: Importing with Xarray from test.nc
14:02:16 INFO    opendrift:118: Returning <class 'opendrift.models.oceandrift.OceanDrift'> object
14:02:17 INFO    opendrift.models.basemodel:4667:       calculating for origin_marker 0...
14:02:17 INFO    opendrift.models.basemodel:4667:       calculating for origin_marker 1...
14:02:17 INFO    opendrift.models.basemodel:4667:       calculating for origin_marker 2...
14:02:17 INFO    opendrift.models.basemodel:4667:       calculating for origin_marker 3...
14:02:17 INFO    opendrift.models.basemodel:4667:       calculating for origin_marker 4...

Show which of the 5 sources are dominating within each grid cell

oa.animation(background=dom, show_elements=False, bgalpha=1,
             legend=oa.origin_marker, colorbar=False, vmin=0, vmax=4)

14:02:17 DEBUG   opendrift.models.basemodel:3180: Setting up map: corners=None, fast=False, lscale=None
14:02:17 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
/opt/conda/envs/opendrift/lib/python3.11/site-packages/cartopy/mpl/geoaxes.py:1696: UserWarning: No data for colormapping provided via 'c'. Parameters 'cmap', 'vmin', 'vmax' will be ignored
  result = super().scatter(*args, **kwargs)
14:02:36 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:37 DEBUG   opendrift.models.basemodel:3855: Saving animation..
14:02:37 INFO    opendrift.models.basemodel:5350: Saving animation to /root/project/docs/source/gallery/animations/example_dominating_0.gif...
14:02:37 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:38 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:39 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:41 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:42 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:43 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:45 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:46 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:48 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:49 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:50 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:51 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:53 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:54 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:55 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:57 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:58 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:02:59 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:01 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:02 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:03 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:04 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:05 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:07 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:08 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:09 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:10 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:11 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:13 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:14 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:15 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:17 DEBUG   opendrift.readers.reader_global_landmask:83: Adding GSHHG shapes from cartopy, scale: h, extent: (3.435968017578124, 5.1932105064392085, 59.68026428222656, 60.350817871093746)..
14:03:18 DEBUG   opendrift.models.basemodel:5388: MPLBACKEND = agg
14:03:18 DEBUG   opendrift.models.basemodel:5389: DISPLAY = None
14:03:18 DEBUG   opendrift.models.basemodel:5390: Time to save animation: 0:00:41.304910
14:03:18 INFO    opendrift.models.basemodel:3848: Time to make animation: 0:01:01.204117

os.remove(of)