terrainanalysis

terrainanalysis - Terrain Analysis Keith Clarke Geog 176A...

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Terrain Analysis Keith Clarke Geog 176A
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Terrain issues DEM normal reflects “bare earth” Heights can include surface features, natural and man-made Digital elevation model Digital terrain model Digital surface model True 3D model Heights include depths Dynamic world: subsistence, landslides, etc. Technology of measurement improving faster than models and methods
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Models for terrain Contours: Vector Regular point samples Irregular point samples DEMs Surface patches TIN Voxel 3D point cloud
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Point samples
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Contours
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TIN
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Voxels
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True 3D models
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Terrain “skeleton” Warntz network Surface network
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Mosaicing issues
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Global scale terrain data ETOPO5 and descendents (GLOBE) NGDC Originally 5 arc sec. (9km) Geographic coords. Cartographic source at 1:250K Includes bathymetry DCW-VMAP0-Global Map Vector source 1:1M much data at 1km SRTM 90 and 30m Known problems with shadow and water DGIS Aster satellite base 30m globally
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This note was uploaded on 12/28/2011 for the course GEOG 176a taught by Professor Clarke during the Fall '09 term at UCSB.

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terrainanalysis - Terrain Analysis Keith Clarke Geog 176A...

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