I'd like to filter a large collection of Landsat 5 Surface Reflectance images by cloud cover within a small region of interest (not the entire image scene) in Google Earth Engine. I know there are ways of accomplishing this using TOA reflectance, but so far I have not found any solutions for SR imagery.
I have applied a cloud mask, however that often results in images that are 90% masked out in my ROI and are basically useless. I'd like to avoid downloading such images in the first place.