Note that r.cva is really just a convenient way of
calling r.los multiple times and adding the results
for a cumulative viewshed analysis. You can get
the same net result by using r.los or r.viewshed
and r.mapcalc. As far as I recall, the earth curvature
correction is also identical across all modules.
Best,
Ben
--
Benjamin Ducke
{*} Geospatial Consultant
{*} GIS Developer
benducke AT fastmail.fm
On Wed, Jul 3, 2013, at 1:51, Hamish wrote:
> Nikos wrote:
>
> > a friend needs to use r.cva [0,1] (and r.viewshed [2]). What is the status
> > of
> > this add-on? Does it also work in G7? Only in G64 and previous releases?
> ...
> > [0] Link <https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.cva/>
> > does not exist anymore!
> >
> > [1] only here: <http://www.ucl.ac.uk/~tcrnmar/GIS/r.cva.html> ?
>
> As I understand it, Mark's employer (university) would not let him
> release the work as GPL-compatible. Otherwise the module would have
> replaced r.los in the main GRASS source distribution years ago, and
> their institution would have been cited many many times from it, but
> oh well, he tried a number of times to convince them.
>
> Considering universities like Johns Hopkins and Columbia literally
> generate billions of dollars licensing IP (typically bio-med), and
> how underfunded most educational institutions are, you can understand
> a bit why the suits at other universities around the world have a
> hard time seeing very far past the $ signs for anything and everything.
> :-/
>
> Hamish
>
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