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v.extrude.1grass

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,...]

Feature type
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 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: 2008-02-29 00:33:29 +0100 (ven, 29 feb 2008) $

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