I have downloaded a series of Landsat-8 level 2 images. My main purpose is to obtain reflectance out of them; however, the scale of the different bands does not look like reflectance (e.g. Blue Band goes from -2000 to 9393).

I am assuming those numbers correspond to digital numbers (DN) (I am not 100% sure), so I am wondering if there is a procedure to convert this DN to reflectance for this level 2 data.

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There is a scaling factor applied to the data. See the surface reflectance table at https://www.usgs.gov/land-resources/nli/landsat/landsat-collection-2-level-2-science-products.

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