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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 • TIN • Voxel 3D point cloud Point samples
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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 • SRTM 90 and 30m Known problems with shadow and water • DGIS
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  • Fall '09
  • Clarke
  • Terrain, Digital elevation model, Terrain Analysis, Digital terrain model, scale terrain data, Terrain issues

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