NAME
v.extrude - Extrudes flat vector object to 3D with defined height.
KEYWORDS
vector, geometry, 3D
SYNOPSIS
v.extrude
v.extrude help
v.extrude [-t] input=name output=name [zshift=float] [elevation=name] [height=float] [hcolumn=name] [type=string[,string,...]] [layer=integer] [--overwrite] [--verbose] [--quiet]
Flags:
- -t
- Trace elevation
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- input=name
- Name of input 2D vector map
- output=name
- Name of resulting 3D vector map
- zshift=float
- Shifting value for z coordinates
- Default: 0
- elevation=name
- Elevation raster for height extraction
- height=float
- Fixed height for 3D vector objects
- hcolumn=name
- Name of attribute column with object heights
- type=string[,string,...]
- Type
- Feature type(s)
- Options: point,line,boundary,area
- Default: point,line,boundary,area
- layer=integer
- Layer number
- A single vector map can be connected to multiple database tables. This number determines which table to use.
- Default: 1
DESCRIPTION
v.extrude creates 3D faces, kernels or lines based on 2D
vector objects, i.e. points become 3D vertical lines, lines to 3D
lines, boundaries to faces and areas to faces and kernel.
If the flag -t is used then 3D vector objects follow the
elevation model by using individual elevation values for the vertices
and nodes. This can be useful for models of large objects (forest
stands).
EXAMPLES
3D houses with fixed height
v.extrude input=houses output=houses3D height=5 type=area
3D houses with individual height
v.extrude input=houses output=houses3D elevation=dem hcolumn=height type=area
Convert 2D lines to 3D with fixed height
v.extrude input=lines output=lines3D elevation=dem height=0 type=line
AUTHOR
Jachym Cepicky,
Updated by Martin Landa, FBK-irst, Italy
Last changed: $Date: 2007-10-11 06:28:23 -0700 (Thu, 11 Oct 2007) $
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