Hello,
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.
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.
also tried to copy the masked area with mapcalc, same problem.
what is the best way to cut huge images into pieces without loosing data information?
thanks
christian
Hi Christian
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.
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.
Cheers
Paulo
On Wed, Jul 20, 2011 at 5:32 PM, Christian Röttger <chris.roettger@uni-muenster.de> wrote:
Hello,
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.
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.
also tried to copy the masked area with mapcalc, same problem.what is the best way to cut huge images into pieces without loosing data information?
thanks
christian
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