  Maybe it's about kernel density estimation and non-parametric kernel
regression estimation in point pattern analysis. I have some materials on
application and theories for them, but i haven't found how to do them in R,
respectively.
  Anybody can show the functions for kernel density estimation and
non-parametric kernel regression estimation in point pattern analysis?
  BTW, for Dr. Gerald Jurasinski , contact me if you need the materials i
mentioned above.

On 8/28/07, r-sig-geo-request@stat.math.ethz.ch <
r-sig-geo-request@stat.math.ethz.ch> wrote:
>
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>   1. (no subject) (Gerald Jurasinski)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 28 Aug 2007 10:40:12 +0200
> From: Gerald Jurasinski <gerald.jurasinski@uni-rostock.de>
> Subject: [R-sig-Geo] (no subject)
> To: r-sig-geo@stat.math.ethz.ch
> Message-ID: <3D5CAC70-631D-43A9-BEBF-348603C3D71E@uni-rostock.de>
> Content-Type: text/plain
>
> Hello,
>
> In our lab we have an actual mapping problem and maybe there is an R
> solution to it.
> Aim is to calculate a surface from calculated data of fine root
> biomass. Therefore a number of single trees (approx. 3000) have been
> sampled. With a function from the literature it is possible to
> estimate the spatial distribution of the fine root biomass of this
> single tree depending on tree species, tree diameter at breast height
> and the distance from the stem. Around each tree something like a
> Gaussian bell curve results.
>
> We thought about creating radial polygons around each tree (the
> radius results from the application of the function), To sample a
> number (depending on the radius) of randomly distributed points
> inside each polygon (with sample.Spatial). To calculate the value of
> fine root biomasss for each of the points (from the formula). And to
> use this points to create the surface.
>
> Is there maybe a better and more straightforward way to do this?
>
> Many thanks for suggestions.
> Gerald Jurasinski
>
> ——————————————————
>
> Dr. Gerald Jurasinski
> Landschaftsökologie und Standortkunde
> Institut Management Ländlicher Räume
> Agrar- und Umweltwissenschaftliche Fakultät
> Universität Rostock
> Justus-von-Liebig-Weg 6
> 18059 Rostock
>
> gerald.jurasinski@uni-rostock.de
> http://www.auf.uni-rostock.de/loe
> +49 381 4983225 (tel)
> +49 381 4983222 (fax)
>
>
>
>
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> End of R-sig-Geo Digest, Vol 48, Issue 22
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>



-- 
With Kind Regards,

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[***********************************************************************]
Zhi Jie,Zhang ,PHD
Tel:86-21-54237149
Dept. of Epidemiology,School of Public Health,Fudan University
Address:No. 138 Yi Xue Yuan Road,Shanghai,China
Postcode:200032
Email:epistat@gmail.com
Website: www.statABC.com
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