table of contents
v.drape(1grass) | GRASS GIS User's Manual | v.drape(1grass) |
NAME¶
v.drape - Converts 2D vector features to 3D by sampling of elevation raster map.
KEYWORDS¶
vector, geometry, sampling, 3D, surface information
SYNOPSIS¶
v.drape
v.drape --help
v.drape input=name [layer=string]
[cats=range] [where=sql_query]
[type=string[,string,...]] output=name
elevation=name [method=string]
[scale=float] [null_value=float]
[--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files - --help
-
Print usage summary - --verbose
-
Verbose module output - --quiet
-
Quiet module output - --ui
-
Force launching GUI dialog
Parameters:¶
- input=name [required]
-
Name of input vector map
Or data source for direct OGR access - layer=string
-
Layer number or name (’-1’ for all layers)
A single vector map can be connected to multiple database tables. This number determines which table to use. When used with direct OGR access this is the layer name.
Default: -1 - cats=range
-
Category values
Example: 1,3,7-9,13 - where=sql_query
-
WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000 - type=string[,string,...]
-
Input feature type
Options: point, line, boundary, centroid
Default: point,line,boundary,centroid - output=name [required]
-
Name for output vector map - elevation=name [required]
-
Elevation raster map for height extraction - method=string
-
Sampling interpolation method
Options: nearest, bilinear, bicubic
Default: nearest
nearest: Nearest-neighbor interpolation
bilinear: Bilinear interpolation
bicubic: Bicubic interpolation - scale=float
-
Scale factor sampled raster values
Default: 1.0 - null_value=float
-
Height for sampled raster NULL values
DESCRIPTION¶
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.
NOTES¶
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.
EXAMPLES¶
Spearfish example:
v.drape in=roads elevation=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 elevation=elevation.dem output=roads_3d \
method=nearest scale=1.0 where=’cat=5’ layer=1 null_value=1000
POVRAY example¶
#export the vector data v.drape in=roads out=roads3d elevation=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
SEE ALSO¶
v.extrude, v.to.3d, r.out.pov, v.in.region, v.out.pov, v.overlay, v.split, v.what.rast
AUTHORS¶
Dylan Beaudette, University of California at Davis.
Updated for GRASS 7 by Martin Landa, Czech Technical University in Prague,
Czech Republic
SOURCE CODE¶
Available at: v.drape source code (history)
Accessed: Saturday Jul 27 17:08:41 2024
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GRASS 8.4.0 |