[GRASS-user] r.los

[Michael Barton]

GRASS has 2 routines specially designed to interpolate raster maps from
contours.

1. Use r.surf.contour: Convert your vector contours to raster using
v.to.rast. Then create a raster map from the contours using r.surf.contour.

2. Use v.surf.rst: More sophisticated and complicated module, but will read
your vector contours directly. Check the manual for details.

Michael


On 7/30/07 2:31 PM, "Richard Chirgwin" <rchirgwin at ozemail.com.au> wrote:

> Since r.los only works on rasters, I need to create the raster files.
> How do you create rasters starting with a set of vector contour maps?
> 
> I tried running v.extrude, using the "Elevation" column for the
> attribute. Grass processes this okay, reporting:
> 
> Number of nodes: 197049
> Number of primitives: 197056
> Number of points: 0
> Number of lines: 0
> Number of boundaries: 0
> Number of faces: 197056
> Number of areas: 0
> Number of isles: 0
> 
> When I try to display the resulting map, however, I get a blank display.
> Have I failed to configure something for the display of the 3D output?
> 
> Richard Chirgwin
> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton