[Gvsig_english] SEXTANTE Visibility Tool

[Benjamin Ducke]

If you use gvSIG OADE 2010 with the included GRASS modules, than you
can also try r.cva. It's an extremely flexible tool for cumulative
viewshed analysis (although a bit slow) and includes curvature
correction. However, the correction is not very well tested, so if
you try it I would love to hear how it worked for you!

Best,

Ben

----- Original Message -----
> Il 22/12/2010 0.10, Angus Jeffery ha scritto:
> > Hello This Sextante Visibility tool is great. However, does anybody
> > know if
> > it is possible to show the visibility of more than one point, for
> > example an array of wind turbines? Is it possible to do this by
> > referring to a .shp or .dxf which contains point data and contains
> > height attributes, etc.? Does anybody know if the tool takes into
> > account, or if it is possible to take into account earth curvature -
> > this is unlikely to be significant at close range, but could be at
> > 10km plus.
> Hi Angus,
> you could calculate "cumulative viewsheds" in SEXTANTE using its
> Modeler (or Beanshell scripts). You should make an intensive use
> of Map Algebra by Raster Calculator in order to take in count the
> effects of earth curvature and atmospheric refraction (because
> Visibility tool doesn't actually), to consider the heights of wind
> turbines, observers and so on...
> 
> Cheers,
> Antonio
> 
> -- Antonio Falciano
> http://www.linkedin.com/in/antoniofalciano
> 
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