legend symbols map topographic topo usgs maps used colors includes below version latest
cdl cropland dbf usda nass overlay interpret refer
map geologic legends geology coverage resolution gaiagps gaia bedrock
color land cover classification palette colors nlcd usgs shelton mapping national maps rgb schemes dataset data combos figure assigned left
symbols legende cartography umjetna spolni organi ciklus bearbeiten
legend map gis features geography key define symbology example gisgeography