def find_shifted_index(ds_subset, lat, lon, heights, nans):
hvals = np.ma.ones(nans.shape)
hvals.mask = nans
hvals[~nans] = heights
hvals[hvals < 1] = 0
hvals = hvals.reshape(ds_subset.dims["x"], ds_subset.dims["y"]).T
glon, glat = project_xy_to_latlon(ds_subset.x, ds_subset.y, ds_subset)
apparent_cloudlocs = utils.RotatedECRPosition.from_geodetic(glat, glon, 0)
actual_cloudlocs = utils.find_actual_cloud_position(
ds_subset.erebos.spacecraft_location, apparent_cloudlocs, hvals)
sun_pos = utils.get_solar_ecr_position(
ds_subset.erebos.t.astype(int).item() / 1e9, lat, lon)
shadowlocs = utils.find_apparent_cloud_position(sun_pos, actual_cloudlocs)
site_pos = utils.RotatedECRPosition.from_geodetic(lat, lon, 0)
sdist = dist(site_pos, shadowlocs)
minargs = sdist.argsort(axis=-1)
sorted_sdist = sdist.reshape(-1)[minargs]
limit = (sorted_sdist < np.sqrt(3)).argmin()
if limit == 0:
return (10, 10)
limhvals = hvals.ravel()[minargs[:limit]]
shifted_loc = minargs[np.argmax(limhvals)]
shifted_yx = np.unravel_index(shifted_loc, hvals.shape) # y, x
return shifted_yx
def test_find_position_roundtrip():
app_cloud = utils.RotatedECRPosition(*APPARENT_POS)
sat_pos = utils.RotatedECRPosition(*GOES17_POS)
actual = utils.find_actual_cloud_position(sat_pos, app_cloud,
CORRECTED_LATLONH[-1])
app = utils.find_apparent_cloud_position(sat_pos, actual)
np.testing.assert_allclose(app, app_cloud, rtol=1e-6)
def test_find_actual_cloud_position():
app_cloud = utils.RotatedECRPosition(*APPARENT_POS)
sat_pos = utils.RotatedECRPosition(*GOES17_POS)
actual = utils.find_actual_cloud_position(sat_pos, app_cloud,
CORRECTED_LATLONH[-1])
exp = utils.RotatedECRPosition(*CORRECTED_POS)
np.testing.assert_allclose(actual, exp)
def translate_calipso_locations(calipso_ds, goes_ds, fill_na=True, level=0):
# nan means no cloud
cloud_heights = calipso_ds.erebos.cloud_top_altitude[:, level].values
if fill_na:
cloud_heights = np.ma.fix_invalid(cloud_heights).filled(0)
terrain_height = calipso_ds.erebos.surface_elevation[:, 0].values
cloud_locations = utils.RotatedECRPosition.from_geodetic(
calipso_ds.erebos.Latitude[:, 0].values,
calipso_ds.erebos.Longitude[:, 0].values,
0.0,
)
actual_cloud_pos = utils.find_actual_cloud_position(
calipso_ds.erebos.spacecraft_location, cloud_locations, cloud_heights)
apparent_cloud_pos = utils.find_apparent_cloud_position(
goes_ds.erebos.spacecraft_location, actual_cloud_pos, terrain_height)
alat, alon = apparent_cloud_pos.to_geodetic()
goes_cloud_pos = goes_ds.erebos.crs.transform_points(
ccrs.Geodetic(), alon, alat)
return goes_cloud_pos[:, :2]
def test_find_actual_cloud_position_no_height():
app_cloud = utils.RotatedECRPosition(*APPARENT_POS)
sat_pos = utils.RotatedECRPosition(*GOES17_POS)
actual = utils.find_actual_cloud_position(sat_pos, app_cloud, 0)
np.testing.assert_allclose(actual, app_cloud, rtol=1e-6)