Lab 1 - Topographic map intro.ppt - Introduction to...

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Introduction toIntroduction toTopographicTopographicMapsMaps
Topographic MapsTopographic MapsTwo dimensional model of the Earth’ssurface (represents 3-D world)Topographic maps are also known ascontour maps.Show elevation above sea level usingcontour lines.
Contour Map“Real World”
Topographic MapsTopographic MapsContour LineContour Line- line on a map that connects points of EQUAL elevation.- show elevation and shape of the landRelief– Difference between high and low elevations
Topographic MapsTopographic MapsContour IntervalContour Intervaldifference in elevationbetween each line.520540560580Contour interval =20 feet
Topographic MapsTopographic MapsIndex Contour –Usually every 5thline is printed darker and hasan elevation printed on it.
Rules for Contours1.Contour lines never cross
Rules for Contours2.Contours form closed loops (even if notshown of the map.
Rules for Contours3.Contours bend upstream(uphill) whencrossing a stream.
Rules for Contours

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Term
Spring
Professor
N/A
Tags
Geology, Topography, Topographic map, 63 360 inches

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