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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