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| | Teaching with USGS Topographic Maps: 25 Ideas |
 | | Topographic maps include contour lines indicating landforms and elevations, hydrography (rivers, lakes, marshes, transportation (roads, trails, railroads, airports), vegetation, boundaries, survey markers, urban areas, buildings, and a variety of other features. |
 | | These maps are drawn according to the National Map Accuracy Standard and are most commonly published at 1:24,000, 1:100,000, 1:250,000, and 1:500,000-scale, although many other scales exist as well. |
 | | Topographic maps of an urban area at 1:24,000 and 1:100,000 scale. |
| rockyweb.cr.usgs.gov /outreach/topoteach.html (2753 words) |
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