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 <[EMAIL PROTECTED]> 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
