[GRASS-user] r.los

[Michael Barton]

Thanks for the clarification. This is good to know. Any other options
besides r.surf.contour?

Michael


On 7/31/07 3:25 PM, "Maciej Sieczka" <tutey at o2.pl> wrote:

> Michael Barton wrote:
>> GRASS has 2 routines specially designed to interpolate raster maps from
>> contours.
> 
> ...
> 
>> 2. Use v.surf.rst: More sophisticated and complicated module, but will read
>> your vector contours directly. Check the manual for details.
> 
> v.surf.rst is not designed for elevation contours lines input. It
> *might* work well with contours, but in general it prefers homogenous
> points input, like LIDAR or SRTM. In case of elavation contour lines,
> which have irregular distribution by nature, RST produces curvature
> artifacts. Also, as v.surf.rst uses segmentation to preserve memory,
> any clustered input tends to lead to "stairy" artifacts at segments'
> joins. Both side effects are possible to minimise bu adjusting tension,
> smoothing and other parameters, but success is not guaranteed.
> 
> Maciek

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

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