.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "gallery/example_reader_boundary.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code. .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_example_reader_boundary.py: Reader boundary ================================== Seeding elements around the border of a ocean model domain (NorKyst800) to demonstrate autmatic transition back and forth with another model covering a larger domain (Topaz). .. GENERATED FROM PYTHON SOURCE LINES 10-28 .. code-block:: Python from datetime import datetime import numpy as np 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('https://thredds.met.no/thredds/dodsC/fou-hi/norkystv3_800m_m00_be') # Topaz reader_topaz = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml') o.add_reader([reader_norkyst, reader_topaz]) o.set_config('environment:fallback:land_binary_mask', 0) o.set_config('drift:vertical_mixing', False) .. rst-class:: sphx-glr-script-out .. code-block:: none 09:19:04 INFO opendrift:569: OpenDriftSimulation initialised (version 1.14.9 / v1.14.9-61-g2d35ef6) 09:19:04 INFO opendrift.readers:67: Opening file with xr.open_dataset 09:19:06 INFO opendrift.readers.reader_netCDF_CF_generic:340: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'} 09:19:06 INFO opendrift.readers.basereader:178: Variable x_sea_water_velocity will be rotated from eastward_sea_water_velocity 09:19:06 INFO opendrift.readers.basereader:178: Variable y_sea_water_velocity will be rotated from northward_sea_water_velocity 09:19:06 INFO opendrift.readers.basereader:178: Variable x_wind will be rotated from eastward_wind 09:19:06 INFO opendrift.readers.basereader:178: Variable y_wind will be rotated from northward_wind 09:19:06 INFO opendrift.readers:67: Opening file with xr.open_dataset 09:19:09 INFO opendrift.readers.reader_netCDF_CF_generic:340: Detected dimensions: {'x': 'x', 'y': 'y', 'time': 'time'} .. GENERATED FROM PYTHON SOURCE LINES 29-30 Seeding some particles .. GENERATED FROM PYTHON SOURCE LINES 30-34 .. code-block:: Python lons = np.linspace(5, 8, 50) lats = np.linspace(69.8, 70.8, 50) lons, lats = np.meshgrid(lons, lats) .. GENERATED FROM PYTHON SOURCE LINES 35-36 Seed oil elements at defined position and time .. GENERATED FROM PYTHON SOURCE LINES 36-39 .. code-block:: Python o.seed_elements(lons, lats, radius=0, number=2500, time=datetime.now()) .. rst-class:: sphx-glr-script-out .. code-block:: none 09:19:09 INFO opendrift.models.basemodel.environment:203: Adding a global landmask from GSHHG 09:19:13 INFO opendrift.models.basemodel.environment:227: Fallback values will be used for the following variables which have no readers: 09:19:13 INFO opendrift.models.basemodel.environment:230: horizontal_diffusivity: 0.000000 09:19:13 INFO opendrift.models.basemodel.environment:230: sea_surface_wave_significant_height: 0.000000 09:19:13 INFO opendrift.models.basemodel.environment:230: sea_surface_wave_stokes_drift_x_velocity: 0.000000 09:19:13 INFO opendrift.models.basemodel.environment:230: sea_surface_wave_stokes_drift_y_velocity: 0.000000 09:19:13 INFO opendrift.models.basemodel.environment:230: ocean_mixed_layer_thickness: 50.000000 .. GENERATED FROM PYTHON SOURCE LINES 40-41 Running model .. GENERATED FROM PYTHON SOURCE LINES 41-43 .. code-block:: Python o.run(steps=16*4, time_step=900, time_step_output=1800) .. rst-class:: sphx-glr-script-out .. code-block:: none 09:19:13 INFO opendrift:1903: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False] 09:19:13 INFO opendrift:1903: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False] 09:19:13 INFO opendrift:1914: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous'])) 09:19:13 INFO opendrift:1914: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous'])) 09:19:13 INFO opendrift:1922: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True] 09:19:13 INFO opendrift:955: Using existing reader for land_binary_mask to move elements to ocean 09:19:13 INFO opendrift:986: All points are in ocean 09:19:13 INFO opendrift:2211: 2026-06-05 09:19:09.362660 - step 1 of 64 - 2500 active elements (0 deactivated) 09:19:18 INFO opendrift:2211: 2026-06-05 09:34:09.362660 - step 2 of 64 - 2500 active elements (0 deactivated) 09:19:18 INFO opendrift:2211: 2026-06-05 09:49:09.362660 - step 3 of 64 - 2500 active elements (0 deactivated) 09:19:19 INFO opendrift:2211: 2026-06-05 10:04:09.362660 - step 4 of 64 - 2500 active elements (0 deactivated) 09:19:21 INFO opendrift:2211: 2026-06-05 10:19:09.362660 - step 5 of 64 - 2500 active elements (0 deactivated) 09:19:22 INFO opendrift:2211: 2026-06-05 10:34:09.362660 - step 6 of 64 - 2500 active elements (0 deactivated) 09:19:23 INFO opendrift:2211: 2026-06-05 10:49:09.362660 - step 7 of 64 - 2500 active elements (0 deactivated) 09:19:24 INFO opendrift:2211: 2026-06-05 11:04:09.362660 - step 8 of 64 - 2500 active elements (0 deactivated) 09:19:26 INFO opendrift:2211: 2026-06-05 11:19:09.362660 - step 9 of 64 - 2500 active elements (0 deactivated) 09:19:27 INFO opendrift:2211: 2026-06-05 11:34:09.362660 - step 10 of 64 - 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2500 active elements (0 deactivated) .. raw:: html 
<xarray.Dataset> Size: 7MB
    Dimensions:                                   (trajectory: 2500, time: 33)
    Coordinates:
      * trajectory                                (trajectory) int64 20kB 0 ... 2499
      * time                                      (time) datetime64[ns] 264B 2026...
    Data variables: (12/22)
        status                                    (trajectory, time) float32 330kB ...
        moving                                    (trajectory, time) float32 330kB ...
        age_seconds                               (trajectory, time) float32 330kB ...
        origin_marker                             (trajectory, time) float32 330kB ...
        lon                                       (trajectory, time) float32 330kB ...
        lat                                       (trajectory, time) float32 330kB ...
        ...                                        ...
        horizontal_diffusivity                    (trajectory, time) float32 330kB ...
        sea_surface_wave_significant_height       (trajectory, time) float32 330kB ...
        sea_surface_wave_stokes_drift_x_velocity  (trajectory, time) float32 330kB ...
        sea_surface_wave_stokes_drift_y_velocity  (trajectory, time) float32 330kB ...
        sea_floor_depth_below_sea_level           (trajectory, time) float32 330kB ...
        land_binary_mask                          (trajectory, time) float32 330kB ...
    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


.. GENERATED FROM PYTHON SOURCE LINES 44-45 Print and plot results .. GENERATED FROM PYTHON SOURCE LINES 45-48 .. code-block:: Python print(o) o.animation(fast=True) .. rst-class:: sphx-glr-script-out .. code-block:: none =========================== -------------------- Reader performance: -------------------- https://thredds.met.no/thredds/dodsC/fou-hi/norkystv3_800m_m00_be 0:00:32.5 total 0:00:00.0 preparing 0:00:32.1 reading 0:00:00.3 interpolation 0:00:00.0 interpolation_time 0:00:00.3 rotating vectors 0:00:00.0 masking -------------------- https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml 0:00:44.5 total 0:00:00.0 preparing 0:00:44.3 reading 0:00:00.0 interpolation 0:00:00.0 interpolation_time 0:00:00.1 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: 1:27.5 total time 8.9 configuration 0.0 preparing main loop 0.0 moving elements to ocean 1:18.6 main loop 0.1 updating elements 0.0 cleaning up -------------------- =========================== Model: OceanDrift (OpenDrift version 1.14.9) 2500 active Lagrangian3DArray particles (0 deactivated, 0 scheduled) ------------------- Environment variables: ----- sea_floor_depth_below_sea_level sea_surface_height x_sea_water_velocity y_sea_water_velocity 1) https://thredds.met.no/thredds/dodsC/fou-hi/norkystv3_800m_m00_be 2) https://thredds.met.no/thredds/dodsC/cmems/topaz6/dataset-topaz6-arc-15min-3km-be.ncml ----- upward_sea_water_velocity x_wind y_wind 1) https://thredds.met.no/thredds/dodsC/fou-hi/norkystv3_800m_m00_be ----- land_binary_mask 1) global_landmask ----- Readers not added for the following variables: horizontal_diffusivity sea_surface_wave_significant_height sea_surface_wave_stokes_drift_x_velocity sea_surface_wave_stokes_drift_y_velocity Discarded readers: Time: Start: 2026-06-05 09:19:09.362660 UTC Present: 2026-06-06 01:19:09.362660 UTC Calculation steps: 64 * 0:15:00 - total time: 16:00:00 Output steps: 33 * 0:30:00 =========================== 09:20:32 WARNING opendrift:2574: Plotting fast. This will make your plots less accurate. 09:20:33 INFO opendrift:4777: Saving animation to /root/project/docs/source/gallery/animations/example_reader_boundary_0.gif... 09:20:54 INFO opendrift:3200: Time to make animation: 0:00:22.283871 .. GENERATED FROM PYTHON SOURCE LINES 49-50 .. image:: /gallery/animations/example_reader_boundary_0.gif .. GENERATED FROM PYTHON SOURCE LINES 50-52 .. code-block:: Python o.plot(fast=True) .. image-sg:: /gallery/images/sphx_glr_example_reader_boundary_001.png :alt: OpenDrift - OceanDrift 2026-06-05 09:19 to 2026-06-06 01:19 UTC (33 steps) :srcset: /gallery/images/sphx_glr_example_reader_boundary_001.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none 09:20:54 WARNING opendrift:2574: Plotting fast. This will make your plots less accurate. (,
) .. rst-class:: sphx-glr-timing **Total running time of the script:** (2 minutes 2.348 seconds) .. _sphx_glr_download_gallery_example_reader_boundary.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: example_reader_boundary.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: example_reader_boundary.py ` .. container:: sphx-glr-download sphx-glr-download-zip :download:`Download zipped: example_reader_boundary.zip ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_