
NAME
v.extrude - Extrudes flat vector features to 3D with defined height.
KEYWORDS
vector, geometry, 3D
SYNOPSIS
v.extrude
v.extrude help
v.extrude [-t] input=name layer=string [type=string[,string,...]] output=name [zshift=float] [elevation=name] [height=float] [hcolumn=name] [--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 vector map
- 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. Layer name for direct OGR access.
- Default: -1
- type=string[,string,...]
- Feature type
- Options: point,line,boundary,area
- Default: point,line,boundary,area
- output=name
- Name for output 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
DESCRIPTION
v.extrude creates faces, kernels, volumes or 3D lines based
on 2D vector objects, i.e. points become 3D vertical lines, lines to
3D lines, boundaries to faces and areas to volumes (composition of
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
SEE ALSO
nviz
AUTHOR
Jachym Cepicky,
Updated by Martin Landa, FBK-irst, Italy
Last changed: $Date: 2008-08-14 23:16:42 -0700 (Thu, 14 Aug 2008) $
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