[Gvsig_english] SEXTANTE Visibility Tool

[Angus Jeffery]

Antonio/Ben/Miguel
Thanks for your replies. I am a relative novice but I will test those
suggestions that are currently feasible and post on progress in due
course.
Kind regards
Angus

On 22 December 2010 17:13, Miguel Montesinos <mmontesinos at prodevelop.es> wrote:
> 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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