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v.drape: Converts vector map to 3D by sampling of elevation raster map.

v.drape - Converts vector map to 3D by sampling of elevation raster map.
vector, geometry, sampling


v.drape v.drape help v.drape input=name [type=string[,string,...]] [rast=name] output=name [method=string] [scale=float] [where=sql_query] [layer=integer] [null_value=float] [--overwrite] [--verbose] [--quiet] Flags: --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input vector map type=string[,string,...] Feature type Options: point,centroid,line,boundary,face,kernel Default: point,centroid,line,boundary,face,kernel rast=name Elevation raster map for height extraction output=name Name for output vector map method=string Sampling method Options: nearest,bilinear,cubic Default: nearest nearest: nearest neighbor bilinear: bilinear interpolation cubic: cubic convolution interpolation scale=float Scale sampled raster values Default: 1.0 where=sql_query WHERE conditions of SQL statement without 'where' keyword Example: income = 10000 layer=integer Layer number Layer is only used for WHERE SQL statement Default: 1 null_value=float Vector Z value for unknown height Will set Z to this value, if value from raster map can not be read


v.drape converts 2D/3D vector data into 3D vector format via sampling of an elevation surface. Three sampling algorithms adapted from v.sample were incorporated into this module: nearest neighbor, bilinear, and cubic convultion. v.drape will skip vector features outside of current computational region or where raster map has NULL value. It's possible to include all vector features by specifying height value that will be assigned to verticles whose values can not be determined from raster map.


Additional vertices can be added to the input 2D vector map with v.split. The module can be used in conjunction with v.out.pov and r.out.pov to export a complete set of vector and raster data for display in POVRAY.


Spearfish example: v.drape in=roads rast=elevation.10m method=bilinear out=roads3d v.info roads3d Create 3D vector roads map containing only "unimproved" roads. Set road height to 1000 m for all parts without height information. v.drape input=roads type=line rast=elevation.dem output=roads_3d \ method=nearest scale=1.0 where='cat=5' layer=1 null_value=1000
#export the vector data v.drape in=roads out=roads3d rast=elevation.10m v.out.pov roads3d out=roads3d.pov #export the raster data r.out.pov elevation.10m tga=elevation.tga r.out.png landcover.30m out=landcover30m.png # now write a complete povray-script and launch povray
r.out.pov, v.in.region, v.out.pov, v.overlay, v.split, v.what.rast, v.extrude


Dylan Beaudette, University of California at Davis. Last changed: $Date: 2008-11-03 11:04:48 +0100 (Mon, 03 Nov 2008) $ Full index (C) 2003-2010 GRASS Development Team V.DRAPE(1)

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