<br><br><div class="gmail_quote">On Tue, Oct 18, 2011 at 2:13 PM, Moritz Lennert <span dir="ltr"><<a href="mailto:mlennert@club.worldonline.be">mlennert@club.worldonline.be</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On 18/10/11 10:26, Rainer M Krug wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
If this mail has made it already to the lst, I apologise - I just could<br>
not find it anywhere.<br>
<br>
<br>
Hi<br>
<br>
I am thinking about the possibility of loading raster directly from<br>
GRASS into R, to avoid the overhang of saving to disk and loading again<br>
or having gdal in between GRASS and R.<br>
</blockquote>
<br></div>
Have you had a look at:<br>
<a href="http://cran.r-project.org/web/packages/spgrass6/" target="_blank">http://cran.r-project.org/web/<u></u>packages/spgrass6/</a></blockquote><div><br>Yes - I am using it regularly and am in more or less regular contact with Roger, the author of the package.<br>
<br>In my opinion, there are a few disadvantages in the approach used (which works perfectly fine in most cases):<br><br>The linking to GRASS si done via GDAL, the gdal-grass plugin or via export from grass to file and import from this file.<br>
<br>So one needs either a middle layer to be installed (GDAL) or go via the more time intensive way via writing to file -- loading from file. If this has to be done a few times, it can cost a considerable amount of time. This is why I was thinking about direct linking the two. The C or C++ code could be called from R to get the cell values and the related metadata, and in R one could construct the spatial layer. This would be considerably faster.<br>
<br>That is my reasoning to the question. As I am not involved in GRASS development, I do not know if there is a function which I could use, or if it could be easily be written.<br><br>Cheers,<br><br>Rainer<br><br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br><font color="#888888">
<br>
Moritz<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)<br><br>Centre of Excellence for Invasion Biology<br>Stellenbosch University<br>
South Africa<br><br>Tel : +33 - (0)9 53 10 27 44<br>Cell: +33 - (0)6 85 62 59 98<br>Fax (F): +33 - (0)9 58 10 27 44<br><br>Fax (D): +49 - (0)3 21 21 25 22 44<br><br>email: <a href="mailto:Rainer@krugs.de" target="_blank">Rainer@krugs.de</a><br>
<br>Skype: RMkrug<br><br>