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Calculate transition of different NDVI classes from pre and post NDVI in Google Earth Engine

There are two steps embedded in your question. Step one is to identify all pixels of a given pre-event NDVI class that changed to a different NDVI class after the event. Step two is to calculate the ...
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No features contain non-null values of in graphy

You are pointing out that already set the system:index but is not true. It can be easily corroborated by using your original Image Collection where is not included that property. As it was well ...
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Masking clouds on Landsat8 with Python before NDVI

I downloaded this image and found two things that are likely throwing you off. The 1st is you must scale the band 4 and 5 data by the scaling factor and offset (see here https://www.usgs.gov/faqs/how-...
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