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by eccc_modis » Wed Aug 15, 2018 11:13 am America/New_York
With MODIS Aqua L1 hdf file download from the Oceancolor website (MYD01.A20*.hdf), I ran GEO and L1A/B processing, using `/run/scripts/modis_GEO.py`, `/run/scripts/modis_L1A_extract.py`, `/run/scripts/modis_L1B.py` in the SEADAS software.But I notice in the created L1B data, some images have correct coordinates, some not. All of them have the same projection description as 'WGS84(DD)', see here:
[URL://drive.google.com/file/d/1QsEof76Co0fZiB9hWnELG79rB5ekCigT/view?usp=sharing ]. The correct image projection for some days (A2017264.1845.061.2018163172118): [URL: //drive.google.com/file/d/1X2SifjxxM39F8bZHz5QT7Ebn0pVlErYP/view?usp=sharing ]the incorrect image projection for some other day, with the same projection description (A2017265.1925.061.2018163172254): [URL: //drive.google.com/file/d/1Y3cV9fNbgZ3iw3SEeFvD5D4KfjonW90k/view?usp=sharing ] What I did wrong?
Nothing. The data are not projected. WGS84 is the datum, the "DD" refers to decimal degrees. Both are true for these data. The first scene was in an orbit that hit the middle of the lake in the middle of the swath. The second hit the lake on the edge of the swath (which is why it looks squished).