[Gvsig_english] Creating density raster/isolines out of point layer

[davk]

Agustin Diez Castillo wrote:
> 
> Davk,
> You can draw the polygons directly from the raster with sextante. If I got
> you right, I
> will proceed like the following:
> 1. reclassify kernel density (instead of contours that you also can draw).
> 2. convert raster to polygons
> Agustin
>> 
>> Hi,
>> 
>> thanks a lot Benjamin. That helped me a lot, it worked well with some
>> sample
>> data!
>> Unfortunately I got points covering a huge area in Gauss-Krüger
>> projection.(~200x200km²) If I want to start the kernel density
>> calculation
>> and choose "layer extent", a window pops up and tells me, that the extent
>> is
>> probably too large, and my PC cant suite this probably. If I want my PC
>> to
>> do this anyhow, it isn't even really starting calculating. But with the
>> sample data it worked, and created 1 Cell / 50m². Do you have any idea
>> how I
>> could manage this?
>> In addition to that, I unfortunately have another problem: I want to
>> convert
>> the raster density map into polygones indicating the density for putting
>> it
>> on another DEM raster layer. If I would put the density map on the DEM
>> raster map, I have to work with transperency, because even the areas wie
>> minimal density would be shown, no? So is it possible to convert the
>> density
>> raster map into polylines first, then delete the polylines which I'm not
>> interested in beeing shown(the minimal density "white space"), and then
>> convert the remaining isolines into polygones and filling it with colors
>> equivalent to their density value. This is sounding very complex, i know.
>> But can I realize it by combining some tools from S EXTANTE?
>> Anyway thanks a lot for your answer Benjamin.
>> 
>> greetings davk
>> 
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