add area & area_percent statistics #169
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@diversoft thanks for the PR. Two comments:
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perrygeo
requested changes
Jan 15, 2023
| if rast.src is not None: | ||
| cellsize = rast.src.res[0] * rast.src.res[1] | ||
| else: | ||
| cellsize = rast.affine.a * rast.affine.a |
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Suggested change
| cellsize = rast.affine.a * rast.affine.a | |
| cellsize = rast.affine.a * rast.affine.e |
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The cells size shouldn't be assumed to be square. It's very rare in practice to see rasters where a != e but it could happen
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I think you need the absolute value here: abs(rast.affine.a * rast.affine.e)
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To be safe, I would recommend reprojecting to be sure. I implemented a utility function for this use-case here - https://github.com/WFP-VAM/prism-app/pull/893/files#diff-0e7a305eb2d7da6652444269a99141f2a18d2fb8ea0ddbc045cd6c5a16e2ee9bR104
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