def test_projection_test(self):
"""Test identification of non-lat/lon projections."""
src_crs = ccrs.PlateCarree()
trg_crs = ccrs.LambertConformal(central_longitude=50,
central_latitude=10)
trg_crs_iris = coord_systems.LambertConformal(central_lon=50,
central_lat=10)
lons = self.cube.coord('longitude').points
lats = self.cube.coord('latitude').points
xvals, yvals = [], []
for lon, lat in zip(lons, lats):
x_trg, y_trg = trg_crs.transform_point(lon, lat, src_crs)
xvals.append(x_trg)
yvals.append(y_trg)
new_x = AuxCoord(xvals,
standard_name='projection_x_coordinate',
units='m',
coord_system=trg_crs_iris)
new_y = AuxCoord(yvals,
standard_name='projection_y_coordinate',
units='m',
coord_system=trg_crs_iris)
cube = Cube(self.cube.data,
long_name="air_temperature",
dim_coords_and_dims=[(self.cube.coord('time'), 0)],
aux_coords_and_dims=[(new_y, 1), (new_x, 2)],
units="K")
plugin = lat_lon_determine
expected = trg_crs
result = plugin(cube)
self.assertEqual(expected, result)
def different_projection(self, method, ancillary_data, additional_data,
expected, **kwargs):
"""Test that the plugin copes with non-lat/lon grids."""
trg_crs = None
src_crs = ccrs.PlateCarree()
trg_crs = ccrs.LambertConformal(central_longitude=50,
central_latitude=10)
trg_crs_iris = coord_systems.LambertConformal(central_lon=50,
central_lat=10)
lons = self.cube.coord('longitude').points
lats = self.cube.coord('latitude').points
x, y = [], []
for lon, lat in zip(lons, lats):
x_trg, y_trg = trg_crs.transform_point(lon, lat, src_crs)
x.append(x_trg)
y.append(y_trg)
new_x = AuxCoord(x,
standard_name='projection_x_coordinate',
units='m',
coord_system=trg_crs_iris)
new_y = AuxCoord(y,
standard_name='projection_y_coordinate',
units='m',
coord_system=trg_crs_iris)
cube = Cube(self.cube.data,
long_name="air_temperature",
dim_coords_and_dims=[(self.cube.coord('time'), 0)],
aux_coords_and_dims=[(new_y, 1), (new_x, 2)],
units="K")
plugin = Plugin(method)
with iris.FUTURE.context(cell_datetime_objects=True):
cube = cube.extract(self.time_extract)
result = plugin.process(cube, self.sites, self.neighbour_list,
ancillary_data, additional_data, **kwargs)
self.assertEqual(cube.coord_system(), trg_crs_iris)
self.assertAlmostEqual(result.data, expected)
self.assertEqual(result.coord(axis='y').name(), 'latitude')
self.assertEqual(result.coord(axis='x').name(), 'longitude')
self.assertAlmostEqual(result.coord(axis='y').points, 4.74)
self.assertAlmostEqual(result.coord(axis='x').points, 9.47)