
Derived Landsat products and analysis resources for dry-season surface-water mapping in the Bangladesh Sundarbans across eight benchmark years (1988–2025). The record contains continuous and binary MNDWI products, binary NDWI comparison maps, four-class change rasters, 10th-percentile permanent-water products, digitised study and Forest Range boundaries, temporal/zonal/threshold tables, a 300-point stratified accuracy dataset with a separate 30-point reliability recheck, and Google Earth Engine/Python analysis code. The archive supports explicit evaluation of whether mapped differences exceed the resolving power of the measurement design. Original Landsat scenes are not redistributed.