[Geotiff] cropping of a GeoTiff

[maphew (matt wilkie)]

John Mitchell wrote:
> Hi,
> 
> I need the capability to be able to crop a GeoTiff based on either
> rectangular coordinates or against a shape rectangular object. 


gdal_translate with the either the -srcwin  or -projwin parameters do 
the former. Srcwin uses pixel coordinates and projwin uses projection 
coordinates. I'm always getting the order of the coordinates mixed up so 
I wrote up this little helper (after asking the list for help...), 
"Clipping using projection coordinates":
http://yukongis.ca/bin/view/Main/GDAL

Croppign can be done interactively with OpenEV, see 
http://yukongis.ca/bin/view/Main/ClipRasterWithoutArcInfo for an example.

cheers,

-matt