Re: [GRASS-dev] Status of r.cva?

[Nikos Alexandris]

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

[rest deleted]
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Re: [GRASS-dev] Status of r.cva?

[Benjamin Ducke]

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   
> > does not exist anymore!
> >
> > [1] only here:  ?
> 
> 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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Re: [GRASS-dev] Status of r.cva?

[Hamish]

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   
> does not exist anymore!
>
> [1] only here:  ?

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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Re: [GRASS-dev] Status of r.cva?

[nik]

Nikos Alexandris:
> > ...(and r.viewshed [2]).

> > [2] Module/manual exists only for G7
> > , 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
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Re: [GRASS-dev] Status of r.cva?

[Markus Metz]

On Tue, Jul 2, 2013 at 1:15 PM, Nikos Alexandris
 wrote:
>
> a friend needs to use r.cva [0,1] (and r.viewshed [2]).

>
> [2] Module/manual exists only for G7
> , not for G64!

r.viewshed is available as add-on for G6:
http://grasswiki.osgeo.org/wiki/AddOns/GRASS_6#r.viewshed

Markus M
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