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<p><font size="-1">Hello Bernardo,</font></p>
<p><font size="-1">I never use it, but the addon r.viewshed.cva
should help you :
<a class="moz-txt-link-freetext" href="https://grass.osgeo.org/grass78/manuals/addons/r.viewshed.cva.html">https://grass.osgeo.org/grass78/manuals/addons/r.viewshed.cva.html</a></font></p>
<p><font size="-1">Regards,<br>
Frank<br>
</font></p>
<div class="moz-cite-prefix">Le 24/11/2020 à 22:56, Bernardo Santos
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:1624112933.1291869.1606254977832@mail.yahoo.com">
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<div dir="ltr" data-setdir="false">Dear list,</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">I need to calculate a
viewshed surface for multiple points (and have, in the end, a
single surface of where any of those points can see). In fact
this is to deal with the other way around: I want to know, in
any position, if it is possible to see back to one of those
points modeled.</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">r.viewshed seems to do the
job, but for a single point at a time.</div>
<div dir="ltr" data-setdir="false">Is there any implementation
doing this for multiple points, like a poit vector as input
instead of a pair (x,y)?</div>
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</div>
<div dir="ltr" data-setdir="false">Thank!</div>
<div dir="ltr" data-setdir="false">Best wishes</div>
<div dir="ltr" data-setdir="false">Bernardo<br>
</div>
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