FVCOM: Using model input from unstructured grid

from datetime import timedelta
import urllib.request as urllib_request
import numpy as np
from opendrift.readers import reader_netCDF_CF_unstructured
from opendrift.readers import reader_global_landmask
from opendrift.models.oceandrift import OceanDrift

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

try:
    proj = "+proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
    fvcom = reader_netCDF_CF_unstructured.Reader(filename = 'https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc', proj4 = proj)
    o.add_reader(fvcom)
    print(fvcom)
except:
    print('Thredds server not available, cannot run example')
    fvcom = None

if fvcom is not None:
    # Seed elements at defined positions, depth and time
    N = 1000
    z = -10*np.random.uniform(0, 1, N)
    o.seed_elements(lon=18.0, lat=69.8, radius=2000, number=N,
                    z=z, time=fvcom.start_time)

    #%%
    # Running model
    o.run(time_step=1800, duration=timedelta(hours=12))

    #%%
    # Print and plot results
    print(o)

    #%%
    # Animation (current as background not yet working).
    o.animation(color='z')

    o.plot(fast=True, buffer = 1.)

11:06:42 INFO    opendrift:569: OpenDriftSimulation initialised (version 1.14.4 / v1.14.4-13-g6c46a55)
11:06:42 INFO    opendrift.readers.reader_netCDF_CF_unstructured:98: Opening dataset: https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
11:06:42 INFO    opendrift.readers.reader_netCDF_CF_unstructured:103: Opening file with Dataset
11:06:43 INFO    opendrift.readers.reader_netCDF_CF_unstructured:107: Using custom projection: +proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs..
11:06:43 INFO    opendrift.readers.reader_netCDF_CF_unstructured:117: Reading grid and coordinate variables..
===========================
Reader: https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
Projection:
  +proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs
Coverage: [degrees]
  xmin: 523286.781250   xmax: 724075.187500
  ymin: 7685101.000000   ymax: 7873698.000000
  Corners (lon, lat):
    ( 15.64,  70.97)  ( 21.13,  70.87)
    ( 15.59,  69.27)  ( 20.66,  69.18)
Vertical levels [m]:
  Not specified
Available time range:
  start: 2018-04-30 01:01:52   end: 2018-05-01 00:00:00   step: None
Variables:
  sea_floor_depth_below_geoid
  sea_surface_height_above_geoid
  x_sea_water_velocity
  y_sea_water_velocity
  sea_water_temperature
  sea_water_salinity
  sea_water_speed - derived from ['x_sea_water_velocity', 'y_sea_water_velocity']
===========================
 0:00:02.0  open dataset
 0:00:00.1  build index

11:06:44 INFO    opendrift.models.basemodel.environment:203: Adding a global landmask from GSHHG
11:06:49 INFO    opendrift.models.basemodel.environment:227: Fallback values will be used for the following variables which have no readers:
11:06:49 INFO    opendrift.models.basemodel.environment:230:    sea_surface_height: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    x_wind: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    y_wind: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    upward_sea_water_velocity: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    ocean_vertical_diffusivity: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_significant_height: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    ocean_mixed_layer_thickness: 50.000000
11:06:49 INFO    opendrift.models.basemodel.environment:230:    sea_floor_depth_below_sea_level: 10000.000000
11:06:49 INFO    opendrift:1787: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False]
11:06:49 INFO    opendrift:1787: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False]
11:06:49 INFO    opendrift:1798: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
11:06:49 INFO    opendrift:1798: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
11:06:49 INFO    opendrift:1806: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True]
11:06:49 INFO    opendrift:945: Using existing reader for land_binary_mask to move elements to ocean
11:06:50 INFO    opendrift:977: Moving 2 out of 1000 points from land to water
11:06:50 INFO    opendrift:2094: 2018-04-30 01:01:52 - step 1 of 24 - 1000 active elements (0 deactivated)
11:06:50 INFO    opendrift.readers.reader_netCDF_CF_unstructured:388: Reading siglay_centers into memory...
11:06:53 INFO    opendrift.readers.reader_netCDF_CF_unstructured:392: Reading siglev_centers into memory...
11:06:56 INFO    opendrift.readers.reader_netCDF_CF_unstructured:401: Reading ocean depth center into memory...
11:06:58 INFO    opendrift:2094: 2018-04-30 01:31:52 - step 2 of 24 - 1000 active elements (0 deactivated)
11:07:01 INFO    opendrift:2094: 2018-04-30 02:01:52 - step 3 of 24 - 998 active elements (2 deactivated)
11:07:02 INFO    opendrift:2094: 2018-04-30 02:31:52 - step 4 of 24 - 998 active elements (2 deactivated)
11:07:04 INFO    opendrift:2094: 2018-04-30 03:01:52 - step 5 of 24 - 998 active elements (2 deactivated)
11:07:13 INFO    opendrift:2094: 2018-04-30 03:31:52 - step 6 of 24 - 998 active elements (2 deactivated)
11:07:19 INFO    opendrift:2094: 2018-04-30 04:01:52 - step 7 of 24 - 998 active elements (2 deactivated)
11:07:22 INFO    opendrift:2094: 2018-04-30 04:31:52 - step 8 of 24 - 997 active elements (3 deactivated)
11:07:26 INFO    opendrift:2094: 2018-04-30 05:01:52 - step 9 of 24 - 997 active elements (3 deactivated)
11:07:27 INFO    opendrift:2094: 2018-04-30 05:31:52 - step 10 of 24 - 997 active elements (3 deactivated)
11:07:29 INFO    opendrift:2094: 2018-04-30 06:01:52 - step 11 of 24 - 997 active elements (3 deactivated)
11:07:31 INFO    opendrift:2094: 2018-04-30 06:31:52 - step 12 of 24 - 997 active elements (3 deactivated)
11:07:34 INFO    opendrift:2094: 2018-04-30 07:01:52 - step 13 of 24 - 997 active elements (3 deactivated)
11:07:37 INFO    opendrift:2094: 2018-04-30 07:31:52 - step 14 of 24 - 997 active elements (3 deactivated)
11:07:40 INFO    opendrift:2094: 2018-04-30 08:01:52 - step 15 of 24 - 997 active elements (3 deactivated)
11:07:42 INFO    opendrift:2094: 2018-04-30 08:31:52 - step 16 of 24 - 997 active elements (3 deactivated)
11:07:45 INFO    opendrift:2094: 2018-04-30 09:01:52 - step 17 of 24 - 997 active elements (3 deactivated)
11:07:48 INFO    opendrift:2094: 2018-04-30 09:31:52 - step 18 of 24 - 993 active elements (7 deactivated)
11:07:52 INFO    opendrift:2094: 2018-04-30 10:01:52 - step 19 of 24 - 991 active elements (9 deactivated)
11:07:56 INFO    opendrift:2094: 2018-04-30 10:31:52 - step 20 of 24 - 989 active elements (11 deactivated)
11:08:03 INFO    opendrift:2094: 2018-04-30 11:01:52 - step 21 of 24 - 988 active elements (12 deactivated)
11:08:21 INFO    opendrift:2094: 2018-04-30 11:31:52 - step 22 of 24 - 988 active elements (12 deactivated)
11:08:33 INFO    opendrift:2094: 2018-04-30 12:01:52 - step 23 of 24 - 988 active elements (12 deactivated)
11:08:36 INFO    opendrift:2094: 2018-04-30 12:31:52 - step 24 of 24 - 988 active elements (12 deactivated)
===========================
--------------------
Reader performance:
--------------------
https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
 0:00:02.0  open dataset
 0:00:00.1  build index
 0:01:46.2  total
 0:00:00.0  preparing
 0:01:46.2  reading
 0:00:00.0  rotating vectors
 0:00:00.0  masking
--------------------
global_landmask
 0:00:01.5  total
 0:00:00.0  preparing
 0:00:01.5  reading
 0:00:00.0  masking
--------------------
Performance:
 1:56.3 total time
    6.3 configuration
    1.5 preparing main loop
      1.5 moving elements to ocean
 1:48.4 main loop
      0.0 updating elements
    0.0 cleaning up
--------------------
===========================
Model:  OceanDrift     (OpenDrift version 1.14.4)
        983 active Lagrangian3DArray particles  (17 deactivated, 0 scheduled)
-------------------
Environment variables:
  -----
  x_sea_water_velocity
  y_sea_water_velocity
     1) https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.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: 2018-04-30 01:01:52 UTC
        Present: 2018-04-30 13:01:52 UTC
        Calculation steps: 24 * 0:30:00 - total time: 12:00:00
        Output steps: 25 * 0:30:00
===========================

11:08:49 INFO    opendrift:4623: Saving animation to /root/project/docs/source/gallery/animations/example_fvcom_0.gif...
11:09:04 INFO    opendrift:3064: Time to make animation: 0:00:24.929802
11:09:04 WARNING opendrift:2453: Plotting fast. This will make your plots less accurate.