[GRASS-user] LOS, Fresnel Zones, Multi-Line wave propagtion and GHz communications

Dylan Beaudette dylan.beaudette at gmail.com
Thu Apr 17 15:40:31 EDT 2008


On Thursday 17 April 2008, Tom Russo wrote:
> On Thu, Apr 17, 2008 at 05:36:18PM +0200, we recorded a bogon-computron 
collision of the <peter.hopfgartner at r3-gis.com> flavor, containing:
> > Dylan Beaudette wrote:
> >> There is also an open source application called 'splat' :
> >> http://www.qsl.net/kd2bd/splat.html
> >>
> >> I do not know if splat can account for near-surface conditions (i.e.
> >> Fresnel Zone) or higher elevation atmospheric parameters (ionosphere).
> >>
> >> It would be nice to have a couple of more robust LOS-like modules in
> >> GRASS for this type of work.
> >
> > from the description on the web page it seems that Fresnel Zones are in
> > SPLAT, at least in recent versions.
> >
> > I will have a look at it, tomorrow.
>
> SPLAT is pretty cool, and if all you want is to compute some RF coverage
> maps it works well as a standalone application.  It would make an
> interesting project for GRASS integration.
>
> As distributed, SPLAT only works when you give it digital elevation models
> in a very specific file format, and it produces PPM output (not
> georeferenced) to display its results.
>
> I've often thought that it would be cool to adapt it to a GRASS module that
> can work with any GRASS elevation data and produce a GRASS raster of RF
> loss and radio coverage instead of an ungeoreferenced image file.  SPLAT
> itself is a fairly simple program once you get digging in it (the math is
> not simple, but the code structure is), but the integration project has
> always been too daunting for me.

I wonder if the core code used in SPLAT would scale better than the current 
r.los algorithm. If that is the case, it might be a nice candidate for an 
r.los replacement for GRASS 7...



-- 
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341


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