Dear grass users I wish to express my gratitude for information on 'r.los'.
Neither r.los nor r.viewshed considered the surface of the sea. Because I had wanted to include the surface of the sea, the null value was converted into 0 by using r.mapcalc. The result was excellent. And....are these modules computable in two or more points?...I'll try it. Best Yasuo shimada (Japan Weather Association) ----- Original Message ----- >Date: Fri, 8 Jul 2011 11:40:18 +0900 (JST) >From: sgw00...@nifty.com >To: grass-user@lists.osgeo.org >Subject: Re: How to estimate viewable area from the top of tha mountain... > > >Sorry, now I find r.viewshed of grass add-on. > >Yasuo shimada > >----- Original Message ----- >>Date: Fri, 8 Jul 2011 11:22:09 +0900 (JST) >>From: sgw00...@nifty.com >>To: grass-user@lists.osgeo.org >>Subject: How to estimate viewable area from the top of tha mountain... >> >> >>Dear grass user >> >>I'm looking for a grass command that unobstructed view area at one station. >> >>For example... >>I want to estimate the veiwable area around the top, when I am in the top of >a >> mountain. It looks like simple, but I cannot see the opponent if there is a >b >>arrier in front of my position. >> >>In bird survey ( bird count in fixed station ), investigator's observation a r >e >>a (or viewable area) is very important.... >> >>Is there a grass command that calcurates viewable area, when altitude dem (r a >s >>t) and the observation point (vect or rast) are given ...? >> >>Best >> >>Yasuo shimada ( Japan weather Association ) _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user