I wrote this in qgis-user list but I'm forwarding for information. Cheers, Luís Ferreira
-------- Forwarded Message -------- > From: Luis Ferreira <[email protected]> > To: [email protected] > 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. > http://grass.osgeo.org/wiki/GRASS_AddOns#r.viewshed > 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. > http://grass.osgeo.org/wiki/GRASS_AddOns#r.cva > > 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 > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/qgis-user > >
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