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<font face="Times New Roman, Times, serif">Dear Matt,<br>
<br>
There are various methods in R to extract the environmental data from
grids to selected points (like the function "sample" in ArcGIS)<br>
<br>
One option is to use the fantastic library maintained by Rob Hijmans
"raster" under the R forge website. <br>
You upload the grids, then stack them and then extract the </font>values
of a RasterLayer or RasterStack for a set of xy coordinates (your
presence and/or absences). This is done via the function xyValues()<br>
<br>
Note that we are also in the process of transforming BIOMOD to be able
to project the potential distributions of species directly onto grids
(using the predict function of the package raster actually). <br>
<br>
Hope it helps,<br>
Wilfried<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Matt Hill a écrit :
<blockquote cite="mid:C6B2E9AA.BC0%25m.hill2@pgrad.unimelb.edu.au"
type="cite">
<pre wrap="">Hi,
I'm pretty new to the modelling scene, am in the process of investigating
various modelling methods for an invasive species in Australia.
I've been using Maxent with the BIOCLIM variables to project distributions
into future climate scenarios.
I was wondering if there is a guide or instructions on the most simple way
to construct a data matrix for use in BIOMOD with it's range of methods?
Ideally I would want to use the same BIOCLIM variables, but I am happy to
start off with baseline CRU data. I understand the principle of the matrix,
just not sure on how to create them.
Any help would be much appreciated,
Matt.
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
--
Wilfried Thuiller
Laboratoire d'Ecologie Alpine, UMR-CNRS 5553
Université J. Fourier
BP 53, 38041 Grenoble Cedex 9, France
Tel: +33 (0)4 76 63 54 53
Fax: +33 (0)4 76 51 42 79
Email: <a class="moz-txt-link-abbreviated" href="mailto:wilfried.thuiller@ujf-grenoble.fr">wilfried.thuiller@ujf-grenoble.fr</a>
Home page: <a class="moz-txt-link-freetext" href="http://www.will.chez-alice.fr">http://www.will.chez-alice.fr</a>
Website: <a class="moz-txt-link-freetext" href="http://www-leca.ujf-grenoble.fr/equipes/tde.htm">http://www-leca.ujf-grenoble.fr/equipes/tde.htm</a>
FP6 European MACIS project: <a class="moz-txt-link-freetext" href="http://www.macis-project.net">http://www.macis-project.net</a>
FP6 European EcoChange project: <a class="moz-txt-link-freetext" href="http://www.ecochange-project.eu">http://www.ecochange-project.eu</a></pre>
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