Hi Christian<br><br>Mask is only masking out areas, it doesn't change your extent. You need to change your region bounds. You can set those is menu-Config-region-set region (or g.region on the command line). Region is a very important concept in GRASS GIS.If you are not familiar with regions, make sure to read a bit more in the help files.<br>
<br>A quick way to change your region extend visually is in the map display window, where you can set your region from the current display.<br><br>Cheers<br><br>Paulo<br><br><br><br><div class="gmail_quote">On Wed, Jul 20, 2011 at 5:32 PM, Christian Röttger <span dir="ltr"><<a href="mailto:chris.roettger@uni-muenster.de" target="_blank">chris.roettger@uni-muenster.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
i'm working with grass 6.4.1 and have a huge quickbird scene which i want to cut, so that i only work with a small sample area.<br>
i created a mask and performed all operations, working very well. but when i export the test area as geotiff it has the same extent as the huge base image.<br>
also tried to copy the masked area with mapcalc, same problem.<br>
<br>
what is the best way to cut huge images into pieces without loosing data information?<br>
<br>
thanks<br><font color="#888888">
christian<br>
<br>
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