[GRASS-user] Re: How to estimate viewable area from the top of tha mountain...

[sgw00412 at nifty.com]

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 at nifty.com
>To: grass-user at 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 ar
e
>a (or viewable area) is very important....
>
>Is there a grass command that calcurates viewable area, when altitude dem (ra
s
>t) and the observation point (vect or rast) are given ...?
>
>Best
>
>Yasuo shimada ( Japan weather Association )