[Gvsig_english] SEXTANTE Visibility Tool

[Miguel Montesinos]

Hi Antonio,
 
we are collaborating with Sextante team for developing a 3D visibility algorithm. That is, given a 3D object placed on a digital terrain model, calculate the visibility area. In this case it won't be a 0/1 raster output, but a raster with a cell value depending on how much the object is seen from any point.
 
Depending on the scale, you may not assume a wind turbine is a point.
 
Unfortunatelly, it will take a while (weeks/months). We'll update this list.
 
Best,
 
Miguel Montesinos

________________________________

De: gvsig_internacional-bounces at listserv.gva.es en nombre de Antonio Falciano
Enviado el: mié 22/12/2010 11:06
Para: gvsig_internacional at listserv.gva.es
Asunto: Re: [Gvsig_english] SEXTANTE Visibility Tool



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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