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Remove impossible ndvi values [minor]#615

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gmyenni merged 3 commits into
mainfrom
ndvi-nas
Jun 4, 2026
Merged

Remove impossible ndvi values [minor]#615
gmyenni merged 3 commits into
mainfrom
ndvi-nas

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@gmyenni

@gmyenni gmyenni commented Jun 3, 2026

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There are 4 large negative NDVI values that must be from bad pixels in the data. Negative values should only represent water or cloud cover. 2 of these have only a handful of pixels, so they are probably cloud cover.
Closes #614

@gmyenni

gmyenni commented Jun 4, 2026

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Clear pixel values are not filtering correctly from QA_PIXEL and we're getting 100% cloud cover every datapoint. This is the second time we've had something go wrong with filtering QA_PIXEL based on 'clear' values. So I'm switching to directly bit filtering. Cloud bits are: Bit 1: Dilated Cloud, Bit 3: Cloud, Bit 4: Cloud Shadow.

@gmyenni gmyenni merged commit 3726422 into main Jun 4, 2026
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@gmyenni gmyenni deleted the ndvi-nas branch June 4, 2026 20:52
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Remove bad ndvi point

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