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

[Agustin Diez Castillo]

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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