survey_collection_products.RdReview source DEM and point-cloud evidence without network requests or inferred availability.
survey_collection_products(discovery)Nonspatial table with two product rows per catalog record. Links are reported, not tested. General catalog access is not product-specific evidence. dem_pixel_size_m uses explicit USGS dem_gsd_meters only; missing/nonpositive values are unknown. A pixel size at most 1 m passes resolution screening only, not scientific suitability. Point spacing is never treated as raster size.