8_Topographic_Maps -...

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Planimetric map:   locations of cultural and natural  features Topographic map:   uses contour lines to convey  information about elevation Latitude and longitude are expressed in degrees,  minutes, and seconds. 60" (seconds) = 1' (minute) 60' (minutes) = 1° (degree) Mean Sea Level (reference for elevation) may vary by year
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Map projections:  representing 3D in 2D Mercator projection: assumes that lines of latitude and longitude  poles. Equal-area projection: maintains correct relative sizes of areas Polyconic projection: adopted by U. S. Geological Survey
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Mercator Projection Equal Area Projection
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Map grids:   C oordinates of latitude and longitude for each location  are unique.  No two locations on the earth’s surface have the same  pair of coordinates. Latitude:
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This note was uploaded on 03/06/2011 for the course GEO 301 taught by Professor Long during the Fall '07 term at University of Texas at Austin.

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8_Topographic_Maps -...

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