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Topographic Base Maps

Topographic Base Maps. Objective – Displays surface features (topography, roads, lakes & river, cultural features) and a grid system (TRS, UTM, Lat/Lon) that allow one to readily locate the geologic features portrayed Best choice of base map is largely dependent on the map scale .

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Topographic Base Maps

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  1. Topographic Base Maps • Objective – Displays surface features (topography, roads, lakes & river, cultural features) and a grid system (TRS, UTM, Lat/Lon) that allow one to readily locate the geologic features portrayed • Best choice of base map is largely dependent on the map scale 1:24,000 scale (7.5’ USGS quadrangle) 1:100,000 scale (30’x60’ USGS sheet) GEOL 3000

  2. Global Grid – Latitude-Longitude

  3. Map Projections Mercator Conical Transverse Mercator Polyconic

  4. Universal Transverse Mercator (UTM) Grid Two Versions of North American Datum (NAD) grid – 1927 and 1983

  5. Surveyed Grid Township, Range, Section Township ~36 sq. miles Section ~1 sq. mile

  6. Potential Misfit of Surveyed Sections

  7. Grids on Topographic Maps Township Boundary Latitude Longitude

  8. Other Information on Topographic Maps

  9. Elements of the Topographic Map USGS Topographic Map Symbol Website <click here>

  10. Topographic Contour Linesconnects points of equal elevation • Rules: • Lines never cross • Lines never end • Lines “V” upstream • Lines encircle hills • and depressions

  11. Reading Topography

  12. Creating a Topographic Profile

  13. Intersection of Topography and Geology

  14. Standard Topographic Basemap Scales 7.5’ Quadrangles 1:24,000 1” = 2000 feet See DNR Maps Website for MN topo maps <click here> 1° x 2 ° Sheets 1:250,000 1” = 4 miles Also: 30’x60’ sheets, 1:100,000, 1”=1.5 miles

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