Kernel Density Mapping?

[Bill Binko]

Brent,

Thanks for the info.  I will certainly look at the R tools: I was 
unaware of an S replacement (it's been years since I've seen S).

It does seem (from what little research I've done) that these R tools 
will generate images, and not shapefiles.

I am primarily like to take Point datasets, and generate polygon 
datasets.  I suppose I could take R, generate rasters, and then use 
gdal_contour to generate the vectors?

However, I am willing (and probably capable) of writing a tool that can 
process the points, run the kernel function and generate the resulting 
contours directly.  Does anyone know where I can find a good description 
of the algorithm and/or some sample code for it?  Perhaps one of the 
professors out there?

Of course, if I did so, I'd be happy to push it back to the community.

Bill

Brent Wood wrote:

>--- Bill Binko <bill at BINKO.NET> wrote:
>
>  
>
>>Hi everyone,
>>
>>[I've been sidelined recently battling some painful bugs in GDAL, 
>>Mapserver, and several raster libs, so I've been putting off some more 
>>general questions I'd love to pose to the list.  This is my first, but 
>>I'll probably send several tonight (sorry to flood).]
>>
>>I'm interested in creating "kernel method" density maps using vector 
>>point data.
>>    
>>
>
>Look at R for this sort of thing, I know several fisheries modellers using R
>for kernel density analyses. R/PostGIS/GRASS/QGIS/mapserver (with Proj.4, GDAL,
>GEOS, etc...) all work pretty well together to support such work as an Open
>Source suite.
>
>See:
>http://www.stat.math.ethz.ch/R-manual/R-devel/library/stats/html/density.html
>
>For a more general list of R functions, 
>http://www.oulu.fi/atkk/tkpalv/unix/R/library/stats/html/00Index.html
>
>and for general R spatial packages/info,
>http://r-spatial.sourceforge.net/
>
>
>
>Hope this helps....
>
>  Brent Wood
>
>
>  
>