Why will some maps show varying contour intervals or use different colors for map features like lakes and rivers?
Both of these variations will sometimes show because your map covers all or part many USGS topos. Contour intervals may vary because they’re based on USGS maps that vary from 5 to 40 feet, depending on the amount of relief (topography) shown. Feature colors and symbology may vary because older USGS maps did not have a standardized printing process.
