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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)

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