What is Toposheets / Topographical sheets/ Topographic maps? Topographic maps or topographic sheets or toposheets are a detailed information of a land area, giving geographic positions and elevations for both natural and man-made features (USGS). Topographical maps, also known as general-purpose maps, are drawn at relatively large scales. These maps show important natural and cultural features … Continue reading SOI Toposheets Number Finder Maps-shapefile Download