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opera-adt / COMPASS

COregistered Multi-temPorAl Sar Slc
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use NETCDF to correctly get geotransform and projection #121

Closed LiangJYu closed 1 year ago

LiangJYu commented 1 year ago

This PR replaces HDF5 with NETCDF as the gdal prefix when using gdal to extract geotransform and projection from the raster.

The error was discovered @scottstanie. The following demonstrates why using HDF5 as the gdal prefix is wrong and why using NETCDF is right.

Using HDF5 as gdal prefix:

In [10]: ds = gdal.Open('HDF5:"stack-no-lut/t087_185682_iw1/20200101/t087_185682_iw1_20200101.h5"://science/SENTINEL1/CSLC/grids/VV')

In [11]: ds.GetGeoTransform()
Out[11]: (0.0, 1.0, 0.0, 0.0, 0.0, 1.0)

In [12]: ds.GetProjection()
Out[12]: ''

Using NETCDF as gdal prefix:

In [14]: ds = gdal.Open('NETCDF:"stack-no-lut/t087_185682_iw1/20200101/t087_185682_iw1_20200101.h5"://science/SENTINEL1/CSLC/grids/VV')

In [15]: ds.GetGeoTransform()
Out[15]: (249650.0, 5.0, 0.0, 2178850.0, 0.0, -10.0)

In [16]: ds.GetProjection()
Out[16]: 'PROJCS["WGS 84 / UTM zone 5N",