Dear Benjamin,
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?
Thank you, Nikos
---
[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> ?
[2] Module/manual exists only for G7
<http://grass.osgeo.org/grass70/manuals/r.viewshed.html>, not for G64!
On Tue, Jul 2, 2013 at 1:15 PM, Nikos Alexandris
<nik@nikosalexandris.net> wrote:
a friend needs to use r.cva [0,1] (and r.viewshed [2]).
[2] Module/manual exists only for G7
<http://grass.osgeo.org/grass70/manuals/r.viewshed.html>, not for G64!
r.viewshed is available as add-on for G6:
http://grasswiki.osgeo.org/wiki/AddOns/GRASS_6#r.viewshed
Markus M
Nikos Alexandris:
> ...(and r.viewshed [2]).
> [2] Module/manual exists only for G7
> <http://grass.osgeo.org/grass70/manuals/r.viewshed.html>, not for G64!
Markus Metz wrote:
r.viewshed is available as add-on for G6:
http://grasswiki.osgeo.org/wiki/AddOns/GRASS_6#r.viewshed
Compiles and works 
Thnx, N
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
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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On Wednesday 03 of July 2013 20:52:29 Benjamin Ducke wrote:
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
Essential! Thanks, Nikos
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