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Fix geos proj parameters for Insat 3d satellites #2969

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merged 4 commits into from
Nov 13, 2024
Merged

Fix geos proj parameters for Insat 3d satellites #2969

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b7f0738
Fix geos proj parameters for insat 3d satellites
mraspaud Nov 6, 2024
6643a88
Fix typo
mraspaud Nov 6, 2024
aca867c
Fix offset
mraspaud Nov 7, 2024
73fc304
Merge branch 'main' into fix-insat-geoloc
mraspaud Nov 7, 2024
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5 changes: 4 additions & 1 deletion satpy/readers/insat3d_img_l1b_h5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,10 @@ def get_area_def(self, ds_id):
#fov = self.datatree.attrs["Field_of_View(degrees)"]
fov = 18
cfac = 2 ** 16 / (fov / cols)
lfac = 2 ** 16 / (fov / lines)

# From reverse engineering metadata from a netcdf file, we discovered
# the lfac is actually the same as cfac, ie dependent on cols, not lines!
lfac = 2 ** 16 / (fov / cols)
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h = self.datatree.attrs["Observed_Altitude(km)"] * 1000
# WGS 84
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2 changes: 2 additions & 0 deletions satpy/tests/reader_tests/test_insat3d_img_l1b_h5.py
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Expand Up @@ -280,6 +280,8 @@ def test_filehandler_returns_area(insat_filehandler):
area_def = fh.get_area_def(ds_id)
_ = area_def.get_lonlats(chunks=1000)
assert subsatellite_longitude == area_def.crs.to_cf()["longitude_of_projection_origin"]
np.testing.assert_allclose(area_def.area_extent, [-5618068.510660236, -5640108.009097205,
5622075.692194229, 5644115.1906312])


def test_filehandler_has_start_and_end_time(insat_filehandler):
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