1v.extrude(1)                  Grass User's Manual                 v.extrude(1)
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NAME

6       v.extrude  - Extrudes flat vector object to 3D with defined height.
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KEYWORDS

9       vector, geometry, 3D
10

SYNOPSIS

12       v.extrude
13       v.extrude help
14       v.extrude   [-t]   input=name   output=name   [zshift=float]    [eleva‐
15       tion=name]                [height=float]                 [hcolumn=name]
16       [type=string[,string,...]]    [layer=integer]    [--overwrite]  [--ver‐
17       bose]  [--quiet]
18
19   Flags:
20       -t
21           Trace elevation
22
23       --overwrite
24           Allow output files to overwrite existing files
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26       --verbose
27           Verbose module output
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29       --quiet
30           Quiet module output
31
32   Parameters:
33       input=name
34           Name of input 2D vector map
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36       output=name
37           Name of resulting 3D vector map
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39       zshift=float
40           Shifting value for z coordinates
41           Default: 0
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43       elevation=name
44           Elevation raster for height extraction
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46       height=float
47           Fixed height for 3D vector objects
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49       hcolumn=name
50           Name of attribute column with object heights
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52       type=string[,string,...]
53           Type
54           Feature type(s)
55           Options: point,line,boundary,area
56           Default: point,line,boundary,area
57
58       layer=integer
59           Layer number
60           A single vector map can be connected to multiple  database  tables.
61           This number determines which table to use.
62           Default: 1
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DESCRIPTION

65       v.extrude  creates  3D  faces,  kernels  or  lines  based  on 2D vector
66       objects, i.e. points become 3D  vertical  lines,  lines  to  3D  lines,
67       boundaries to faces and areas to faces and kernel.
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69       If  the  flag  -t  is  used then 3D vector objects follow the elevation
70       model by using individual elevation values for the vertices and  nodes.
71       This can be useful for models of large objects (forest stands).
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EXAMPLES

74   3D houses with fixed height
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76       v.extrude input=houses output=houses3D height=5 type=area
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78
79   3D houses with individual height
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81       v.extrude  input=houses  output=houses3D  elevation=dem  hcolumn=height
82       type=area
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84
85   Convert 2D lines to 3D with fixed height
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87       v.extrude input=lines output=lines3D elevation=dem height=0 type=line
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SEE ALSO

91        nviz
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AUTHOR

94       Jachym Cepicky,
95       Updated by Martin Landa, FBK-irst, Italy
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97       Last changed: $Date: 2008-02-21 15:34:50 +0100 (Thu, 21 Feb 2008) $
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99       Full index
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101       © 2003-2008 GRASS Development Team
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105GRASS 6.3.0                                                       v.extrude(1)