[GRASS-user] v.extrude: advice on generating 3D building

[Jachym Cepicky]

Hi,

height means hight of the buildings. All buildings can have same height
(height=10) or the height of each building is stored in database
(hcolumn=building_height)

elevation option stays for placement of the building upon the digital
elevation model.

so, in your case, you have to:

1 - prepare DEM *without* building footprints
2 - transfer building height parameter from raster map to attribute
table of the vector file
3 - run v.extrude as

v.extrude ... hcolumn=column_with_building_height \ 
	elevation=lidar_dem_without_buildings

hope it helps

jachym

cheg01 at comcast.net píše v St 17. 10. 2007 v 04:31 +0000:
> I am trying to use v.extrude to generate buildings of varying height. I
>  have a vector file with all of the building outlines and I have a
>  raster file that contains high resolution height data extracted from
>  LIDAR files.  I don't understand the function of v.extrude. I tried
>  specifying the raster file name in the "elevation=" option but I get
>  an error that says I have to either use a constant height in "height="
>  or specify an attribute table column with height data in "hcolumn=". 
>  What does the "elevation" option do? Any suggestions on easy ways to
>  populate a height data column from a raster file?
> 
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-- 
Jachym Cepicky
e-mail: jachym.cepicky at gmail.com
URL: http://les-ejk.cz
GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub

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