fix bug in gdal -> mintpy corner coordinate convention #1034
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yunjunz
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Jul 5, 2023
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yunjunz
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Thank you @sssangha for the careful checking! I introduced this bug in prep_aria in #542. As you said, gdal (and aria, hyp3, and gmtsar by extension) use the upper-left corner of the upper-left pixel as the first coordinates, which is the same as roipac and mintpy, thus, no extra half-pixel shift is needed. I believe you captured all the occurrences in the code. Feel free to squash and merge the PR whenever you are ready please.
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Description of proposed changes
Through the ARIA products workflow, or whenever loading a gdal file in general, an erroneous shift appears to be applied to the accessed geotransform and the derived
x_firstandy_firstfields. Specifically, an extra half pixel shift (to the north and west) is applied when the gdal geotransform object already reports the coordinates of the upper left pixel.I've tracked this bug in a few scripts, but would like advise on where else I should look to track down potential persistent issues.
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