Lecture14

Lecture14 - Contours on maps. What CI? Geography 12: Maps...

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1 Geography 12: Maps and Spatial Reasoning Lecture 14: Representing heights on maps Professor Keith Clarke Contours on maps. What CI? What is a contour line? • Imaginary line joining points of equal elevation above or below a datum • Contour lines have a specific contour interval • Interval is the vertical distance between contours • CI is a function of scale and units • Relief is the highest elevation shown minus the lowest Contour lines
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2 Features of contours • Contour interval • Index contours • Intermediate contours • Supplementary contours • Depressions • Uncertain contours • Bathymetry: isobaths Contour interpretation Interpolation 1 0 x CI=20m YZ X > 140 and < 160 Y > 120 and < 140 Z > 100 and < 120 Slope Slope = Rise vs. Run Four expressions: • Slope ratio (e.g. 1:10) • Slope fraction (e.g. 1/10) • Percent slope (rise per 100 units of run)
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This note was uploaded on 12/27/2011 for the course GEOG 12 taught by Professor Gautier during the Fall '08 term at UCSB.

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Lecture14 - Contours on maps. What CI? Geography 12: Maps...

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