NAME

KEYWORDS

SYNOPSIS

Flags:

-t

Trace elevation

--overwrite

Allow output files to overwrite existing files

--verbose

Verbose module output

--quiet

Quiet module output

Parameters:

input=name [required]

Name of input vector map

Or data source for direct OGR access

layer=string [required]

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

type=string[,string,...]

Feature type

Options: point, line, boundary, area

Default: point,line,boundary,area

output=name [required]

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

AUTHOR

Last changed: $Date: 2011-11-08 13:24:20 -0800 (Tue, 08 Nov 2011) $

Main index - Vector index - Full index

© 2003-2012 GRASS Development Team