def test_tie_points_geo_interpolation(self):
"""# Test the coordinates interpolation routine with valid and invalid input."""
# Test the interpolation routine with valid input
lon, lat = tie_points_geo_interpolation(self.longitude, self.latitude,
TEST_SCAN_ALT_TIE_POINTS,
TEST_TIE_POINTS_FACTOR)
self.assertTrue(np.allclose(lon, TEST_LON_1))
self.assertTrue(np.allclose(lat, TEST_LAT_1))
lon, lat = tie_points_geo_interpolation(self.longitude_over360,
self.latitude,
TEST_SCAN_ALT_TIE_POINTS,
TEST_TIE_POINTS_FACTOR)
self.assertTrue(np.allclose(lon, TEST_LON_2))
self.assertTrue(np.allclose(lat, TEST_LAT_2))
lon, lat = tie_points_geo_interpolation(self.longitude,
self.latitude_over60,
TEST_SCAN_ALT_TIE_POINTS,
TEST_TIE_POINTS_FACTOR)
self.assertTrue(np.allclose(lon, TEST_LON_3))
self.assertTrue(np.allclose(lat, TEST_LAT_3))
# Test the interpolation routine with invalid input (different dimensions of the two arrays)
with self.assertRaises(ValueError):
tie_points_geo_interpolation(self.longitude,
self.invalid_data_for_interpolation,
TEST_SCAN_ALT_TIE_POINTS,
TEST_TIE_POINTS_FACTOR)
def _perform_geo_interpolation(longitude, latitude):
"""Perform the interpolation of geographic coodinates from tie points to pixel points.
Args:
longitude: xarray DataArray containing the longitude dataset to interpolate.
latitude: xarray DataArray containing the longitude dataset to interpolate.
Returns:
tuple of arrays containing the interpolate values, all the original metadata
and the updated dimension names.
"""
interpolated_longitude, interpolated_latitude = tie_points_geo_interpolation(
longitude,
latitude,
SCAN_ALT_TIE_POINTS,
TIE_POINTS_FACTOR
)
new_longitude = interpolated_longitude.rename(
num_tie_points_act='num_pixels',
num_tie_points_alt='num_lines'
)
new_longitude.name = longitude.name
new_longitude.attrs = longitude.attrs
new_latitude = interpolated_latitude.rename(
num_tie_points_act='num_pixels',
num_tie_points_alt='num_lines'
)
new_latitude.name = latitude.name
new_latitude.attrs = latitude.attrs
return new_longitude, new_latitude