From grass-lists-owner@max.cecer.army.mil Thu Nov 19 19:38:03 1992
Hello,
What's the best way to get external vector files into GRASS raster
so that they can be overlayed? I want to know the population inside
of a polygon. I'm starting with ascii counts by tract, the tract
in TIGER boundaries, and x,y(UTM) for the polygon. How do you fill
a polygon? I can probably create the raster files in "C", but is
there a way using GRASS commands?Thank you.
If I read this correctly, you have vector maps with tract polygons
tagged with with populations, and you want to convert the vector map
to raster format so you can do overlay operations.
If the polygons are areas (not lines) in the vector map, then you
can use the v.to.rast program to create raster maps. In the
resulting raster map, the cells in the areas inside the polygons
will all be given the category value of the original polygon from
the vector map.
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Chris Rewerts rewerts@ecn.purdue.edu
Agricultural Engineering, Purdue University