terrainanalysis07

terrainanalysis07 - Terrain issues Terrain Analysis Keith...

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1 Terrain Analysis Keith Clarke Geog 176A 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 Models for terrain • Contours: Vector • Regular point samples • Irregular point samples •DEMs • Surface patches •T IN • Voxel • 3D point cloud
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2 Contours TIN Voxels True 3D models
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3 Terrain “skeleton” Warntz network Surface network Mosaicing issues 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 •SR TM – 90 and 30m – Known problems with shadow and water
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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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terrainanalysis07 - Terrain issues Terrain Analysis Keith...

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