Skip to main content
U.S. flag

An official website of the United States government

At what scales are contours visible in The National Map Viewer?

In the default base map for The National Map Advanced Viewer:

  • 500-foot contours are visible at a scale of 1:578,000 (zoom level 10)
  • 100-foot contours are visible at scales of 1:289,000-1:144,000 (zoom level 11-12)
  • 50-foot contours are visible at a scale of 1:72,000 (zoom level 13)
  • Large scale contours are visible at scales from 1:36,000-1:9,000 (zoom levels 14-16)