Nikos, I ask because I've read almost all the pages of the manual. I use i.rectify: it is the tool to rectify rasters on the base of GCPs. This is not the case.<br><br><div><span class="gmail_quote">2008/1/25, Nikos Alexandris <
<a href="mailto:nikos.alexandris@felis.uni-freiburg.de">nikos.alexandris@felis.uni-freiburg.de</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Although I don't know how (!) I read in a post about i.rectify... Why<br>don't you dig-up the man page...<br><br>Cheers,<br><br>Nikos.<br><br>On Fri, 2008-01-25 at 00:53 +0100, G. Allegri wrote:<br>> I don't have a raster that fits my region. I should create a vector
<br>> with v.in.region, rasterize it and use it as a MASK... well, I hoped<br>> there was something more linear. The same could be used to clip on the<br>> base of a polygon.<br>><br>> The unsolved problem is rotation (and shift): making affine
<br>> tranformations using just a x-shift and y-shift parameter, and a<br>> rotation angle having set a point as origin (or just around the<br>> "center" of the raster).<br>><br>> 2008/1/25, Nikos Alexandris <
<a href="mailto:nikos.alexandris@felis.uni-freiburg.de">nikos.alexandris@felis.uni-freiburg.de</a>>:<br>> Hi,<br>><br>> if you already have a raster that fits your region then simply<br>> create a
<br>> MASK and just create a new raster with r.mapcalc.<br>><br>> r.mapcalc clipped_rast=rast<br>><br>> (r.mapcalc works only on the MASK so you can quickly clip any<br>> raster
<br>> like that).<br>><br>><br>> On Fri, 2008-01-25 at 00:15 +0100, G. Allegri wrote:<br>> > Surely a stupid question, but I can't find a way to clip a<br>> raster on
<br>> > the base of the region settings and/or the base of a vector.<br>> I can<br>> > MASK, I can reclass, but I can't clip!<br>> > Furthermore, is it possible to rotate a raster without the
<br>> use of a<br>> > 1st polynomial rectification through GCPs?<br>> ><br>> > Giovanni<br>> > _______________________________________________<br>> > grass-user mailing list
<br>> > <a href="mailto:grass-user@lists.osgeo.org">grass-user@lists.osgeo.org</a><br>> > <a href="http://lists.osgeo.org/mailman/listinfo/grass-user">http://lists.osgeo.org/mailman/listinfo/grass-user
</a><br>> --<br>> Nikos Alexandris<br>> .<br>> Department of Remote Sensing & Landscape Information Systems<br>> Faculty of Forestry & Environmental Sciences,
<br>> Albert-Ludwigs-University Freiburg<br>> .<br>> Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 /<br>> Skype: Nikos.Alexandris<br>> .<br>> Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
<br>><br>><br>--<br>Nikos Alexandris<br>.<br>Department of Remote Sensing & Landscape Information Systems<br>Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg<br>.<br>Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 / Skype:
Nikos.Alexandris<br>.<br>Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany<br><br></blockquote></div><br>