r.los

[Jianping Xu]

> From grass-lists-owner at max.cecer.army.mil Wed May 11 08:11:41 1994
> Subject: r.los
> Does anybody have ideas about the following : we all know 
> that r.los can show you the area that is visible from a certain 
> observation point, but can it also show you from what area you can observe 
> something (I am told that this is not necessarily the same)?
> 
> And a point of order for the GRASS developers: would it be possible to 
> implement in r.los an input-option that takes a raster map, so you can
> e.g. show the area that is visible from a road so you can plan the most 
> scenic drive? That's all. Any reactions appreciated!
> 
> Philip Verhagen

I do not quite understand your first question. As to the scenic drive, 
since r.los takes one observation pt a time, you can use a shell script to 
run r.los for each point and use r.mapcalc to update the overall visibles.
This probably won't take much more time than a single r.los program with
the suggested option does. 

Jianping Xu	jianp at ocean.rutgers.edu