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I am working on calculating NDVi and EVI indices from different years (50 year time period) and comparing them. I have a few questions regarding the datasets that I have found on Google Earth Engine (GEE). In the Landsat 8 Surface Reflectance dataset that is given on Google Earth Engine, do I have to do any additional preprocessing as it is already atmospherically corrected or do I have to just scale it using the scaling factor?

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    Scaling factor depends on the collection (precol, col1, col2), landsat data isn't that old too. Also, surface reflectance data is already preprocessed, as the name indicates. Check product documentation or metadata for getting the right scaling factor (usually is 10000, but for last collection is different)
    – aldo_tapia
    Jan 5 at 18:33

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