.TH v.extrude 1grass "" "GRASS 6.4.2" "Grass User's Manual"
.SH NAME
\fI\fBv.extrude\fR\fR  - Extrudes flat vector object to 3D with defined height.
.SH KEYWORDS
vector, geometry, 3D
.SH SYNOPSIS
\fBv.extrude\fR
.br
\fBv.extrude help\fR
.br
\fBv.extrude\fR [-\fBt\fR] \fBinput\fR=\fIname\fR \fBoutput\fR=\fIname\fR  [\fBzshift\fR=\fIfloat\fR]   [\fBelevation\fR=\fIname\fR]   [\fBheight\fR=\fIfloat\fR]   [\fBhcolumn\fR=\fIname\fR]   [\fBtype\fR=\fIstring\fR[,\fIstring\fR,...]]   [\fBlayer\fR=\fIinteger\fR]   [--\fBoverwrite\fR]  [--\fBverbose\fR]  [--\fBquiet\fR] 
.SS Flags:
.IP "\fB-t\fR" 4m
.br
Trace elevation
.IP "\fB--overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB--verbose\fR" 4m
.br
Verbose module output
.IP "\fB--quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR" 4m
.br
Name of input 2D vector map
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name of resulting 3D vector map
.IP "\fBzshift\fR=\fIfloat\fR" 4m
.br
Shifting value for z coordinates
.br
Default: \fI0\fR
.IP "\fBelevation\fR=\fIname\fR" 4m
.br
Elevation raster for height extraction
.IP "\fBheight\fR=\fIfloat\fR" 4m
.br
Fixed height for 3D vector objects
.IP "\fBhcolumn\fR=\fIname\fR" 4m
.br
Name of attribute column with object heights
.IP "\fBtype\fR=\fIstring[,\fIstring\fR,...]\fR" 4m
.br
Feature type
.br
Options: \fIpoint,line,boundary,area\fR
.br
Default: \fIpoint,line,boundary,area\fR
.IP "\fBlayer\fR=\fIinteger\fR" 4m
.br
Layer number
.br
A single vector map can be connected to multiple database tables. This number determines which table to use.
.br
Default: \fI1\fR
.PP
.SH DESCRIPTION
.PP
\fIv.extrude\fR 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).
.PP
If the flag \fB-t\fR 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).
.SH EXAMPLES
.SS 3D houses with fixed height
\fC
.DS
.br
v.extrude input=houses output=houses3D height=5 type=area
.br
.DE
\fR
.SS 3D houses with individual height
\fC
.DS
.br
v.extrude input=houses output=houses3D elevation=dem hcolumn=height type=area
.br
.DE
\fR
.SS Convert 2D lines to 3D with fixed height
\fC
.DS
.br
v.extrude input=lines output=lines3D elevation=dem height=0 type=line
.br
.DE
\fR
.SH SEE ALSO
\fI
nviz
\fR
.SH AUTHOR
Jachym Cepicky,
.br
Updated by Martin Landa, FBK-irst, Italy
.PP
\fILast changed: $Date: 2008-02-29 00:33:29 +0100 (Fri, 29 Feb 2008) $\fR
.PP
Full index
.PP
© 2003-2011 GRASS Development Team