[GRASSLIST:5884] Re: creating a building

[H Bowman]

> This is a strange thing, but I am needing to create a polygon to 
> represent a building as a layer. I am doing some modeling and want to 
> just have the building represented. How do I create the shape so that 
> is accurately represented. It could also be just a point. Is there a 
> way to generate sites from a file with x,y data ascii data? or to 
> generate a poloygon that way?

Try making a v.in.ascii or a r.in.poly file by hand. See the respective
man pages for instructions, they aren't that hard. For point data, use
s.in.ascii - you'll need to use it with x,y,somelabel though.

Chapter 12.2.2 of "Open Source GIS: A GRASS GIS Approach" by Neteler &
Mitasova 2002 describes how to draw 3D buildings in NVIZ. (the general
gist is to use r.mapcalc to add the height of the roof to the DEM)


Hamish