[GRASS-dev] [Fwd: Re: [Qgis-user] Inter-visibility analysis]
lferreira75.1 at gmail.com
Fri Mar 30 11:17:54 EDT 2012
I wrote this in qgis-user list but I'm forwarding for information.
-------- Forwarded Message --------
> From: Luis Ferreira <lferreira75.1 at gmail.com>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Inter-visibility analysis
> Date: Fri, 30 Mar 2012 15:57:07 +0100
> Not that I know.
> r.viewshed works relatively fast, with lat long support and the very
> useful option of target ground offset, but with the limitation of one
> pair of observer coordinates per run. Probably, you can make a script to
> read a list of observer coordinate pairs and, using r.mapcalc, integrate
> the obtained viewsheds.
> r.viewshed it is on trunk, already.
> Extending r.viewshed to read vector (point, line or polygon objects
> converted to raster?), using multiple locations for viewshed
> determination, and the the option to calculate the relative
> observability (0.0-1.0) of each resulting surface pixel, will be very
> useful. Probably r.cva solves this, I didn't use r.cva yet.
> Luís Ferreira
> On Sex, 2012-03-30 at 15:42 +0200, Julian Bogdani wrote:
> > Hello,
> > I've been use qgis for a while and I'm starting now with GRASS, too.
> > I'm interested in building a inter-visibility map using a point
> > shapefile and a DEM. QGIS has a plugin for viewshed, and I tried LOS
> > in GRASS which works wonderfully, for a single point of observation.
> > Is there a way to get lines linking sites that are visible from each
> > other?
> > Thank you
> > -----
> > Julian Bogdani
> > http://bradypus.net
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
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