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
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SYNOPSIS

12       v.extrude
13       v.extrude help
14       v.extrude  [-t]  input=string  output=string   [zshift=float]   [eleva‐
15       tion=string]              [height=float]               [hcolumn=string]
16       [type=string[,string,...]]   [layer=integer]   [--overwrite]
17
18   Flags:
19       -t  Trace elevation
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21       --overwrite
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23   Parameters:
24       input=string
25           Name of input 2D vector map
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27       output=string
28           Name of resulting 3D vector map
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30       zshift=float
31           Shifting value for z coordinates Default: 0
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33       elevation=string
34           Elevation raster for height extraction
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36       height=float
37           Fixed height for 3D vector objects
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39       hcolumn=string
40           Column of attribute table with object heights
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42       type=string[,string,...]
43           Type    Options:   line,boundary,area,face   Default:   line,bound‐
44           ary,area,face
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46       layer=integer
47           Layer number Default: 1
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DESCRIPTION

50       v.extrude makes 3D blocks or just walls from 2D polygons or lines.
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52   Selected Flags and Parameters
53       -t  If defined, roof and walls will follow ("trace") the  elevation  by
54           using  individual  elevation  values  for the vertices and nodes at
55           bottom. This should be useful for models of large  objects  (forest
56           stands).
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58       zshift
59           Vertical  shift of vector data on top of values extracted from ele‐
60           vation model/defined fixed height.
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62       elevation
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64       Raster elevation map to put on the vector 3D objects.
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66       height
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68       Global height of vector 3D objects. If not specified, the module
69           expects the hcolumn parameter.
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71       hcolumn
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73       Column from attribute table, in which the attribute of object
74           height is stored (must be of int, double, or varchar type).
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EXAMPLES

77   3D houses with fixed height
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79       v.extrude input=houses output=houses3D height=5
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81
82   3D houses with individual height
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84       v.extrude -t input=houses output=houses3D elevation=dem hcolumn=height
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AUTHOR

88       Jachym Cepicky, jachym.cepicky _at_ centrum _dot_ cz, http://les-ejk.cz
89       Department of Geoinformation Technologies, http://mapserver.mendelu.cz
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91       Last changed: $Date: 2006/01/02 14:44:51 $
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93       Full index
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97GRASS 6.2.2                                                       v.extrude(1)
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