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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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**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**Map Projections**Mercator Conical Transverse Mercator Polyconic**Universal Transverse Mercator (UTM) Grid**Two Versions of North American Datum (NAD) grid – 1927 and 1983**Surveyed Grid Township, Range, Section**Township ~36 sq. miles Section ~1 sq. mile**Grids on Topographic Maps**Township Boundary Latitude Longitude**Elements of the Topographic Map**USGS Topographic Map Symbol Website <click here>**Topographic Contour Linesconnects points of equal elevation**• Rules: • Lines never cross • Lines never end • Lines “V” upstream • Lines encircle hills • and depressions**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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