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: sgw00412@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: sgw00412@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 )