Lecture13

Lecture13 - Depressions Uncertain contours Bathymetry:...

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1 Geography 12: Maps and Spatial Reasoning Lecture 13: Mapping terrain Professor Keith Clarke Ancient terrain depiction Simple hachures Hachures
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2 Bench Mark: ground to map link Elevation: Control BUT Points alone are not enough! Terrain representation • Want visual depiction of the terrain • Also want quantitative information about heights • Two often play against each other
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3 1701 Sir Edmund Halley: Isogones Contour lines 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 Features of contours • Contour interval • Index contours • Intermediate contours • Supplementary contours
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Unformatted text preview: Depressions Uncertain contours Bathymetry: isobaths 4 Reference and Intermediate Index and approximate Enclosed depressions Carrying contour 5 Information OVER the contours Synthetic illumination Bathymetry Hypsometric mapping 6 Hypsometric tints Hypsometry and shading Imhof Shading Shelton shaded relief 7 Tanaka shading Block 3D Perspectives Fishnet perspective Realistic perspective 8 Realistic perspective (2) Anaglyphic stereo 3D Topography and bathymetry Stereotopoquad 9 Shuttered stereo: Polarized Movement depth: VRML Movement Depth: Fly-by Summary: Terrain visualization Pictorial Woolly worms Hachures Contours Colors: Hypsometry Block diagrams Shading Perspective True 3D (or 2.5D)...
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Lecture13 - Depressions Uncertain contours Bathymetry:...

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