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: 2008-02-28 15:33:29 -0800 (Thu, 28 Feb 2008) $

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