[Qgis-user] Clipping tool for non-georeferenced data
Hello, I've add to QGIS non georeferenced data. It is added in 0,0, north up, south down. So the y is negative. When I tried to extract a part of my data with the clipper, I get an error : Error: Computed -srcwin 266 -145 175 -126 has negative width and/or height. or Computed -srcwin falls outside raster size of 156x144. I understand that it is because the coordinate y is negative and the tool can't match it with the real coordinate. Is there a way to clip a non georeferenced data ? Thanks by advance, Alexia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Clipping tool for non-georeferenced data
Hi! Well to be honest .. I would clip non georeferenced data in gimp .. There you have plenty of options to mask and cut/clip your non georeferenced images .. Unless you have a specific reason to do that in QGIS .. kind regards Werner On Tue, Jun 4, 2013 at 11:59 AM, Alexia Mondot alexia.mon...@c-s.fr wrote: Hello, I've add to QGIS non georeferenced data. It is added in 0,0, north up, south down. So the y is negative. When I tried to extract a part of my data with the clipper, I get an error : Error: Computed -srcwin 266 -145 175 -126 has negative width and/or height. or Computed -srcwin falls outside raster size of 156x144. I understand that it is because the coordinate y is negative and the tool can't match it with the real coordinate. Is there a way to clip a non georeferenced data ? Thanks by advance, Alexia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Clipping tool for non-georeferenced data
Hi The problem is the way you specified the srcwin parameter. The syntax is: -srcwin xoff yoff xsize ysize So, if you want to clip out the upper left 40x50 cells from a 100x100 raster for example your srcwin should look like this: -srcwin 0 0 40 50 If you wanted to clip out the lower right 40x50 cells from a 100x100 raster for example your srcwin should look like this: -srcwin 60 50 40 50 Have a look here: http://www.gdal.org/gdal_translate.html As the error message indicates, negative values are not allowed... Cheers Stefan From: qgis-user-boun...@lists.osgeo.org [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Alexia Mondot Sent: 4. juni 2013 12:00 To: Qgis-user@lists.osgeo.org Subject: [Qgis-user] Clipping tool for non-georeferenced data Hello, I've add to QGIS non georeferenced data. It is added in 0,0, north up, south down. So the y is negative. When I tried to extract a part of my data with the clipper, I get an error : Error: Computed -srcwin 266 -145 175 -126 has negative width and/or height. or Computed -srcwin falls outside raster size of 156x144. I understand that it is because the coordinate y is negative and the tool can't match it with the real coordinate. Is there a way to clip a non georeferenced data ? Thanks by advance, Alexia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Clipping tool for non-georeferenced data
I have to manage products. Some are georeferenced, some aren't. I have the same actions to do on these products. For all others, it seems to work. That's why I am worried about this functionality. So there is not a way to do that in qgis ? It does not seem to be difficult to do. Just to add the height if the image to the y coordinates the clipper got ? Regards, Alexia On 06/04/2013 12:34 PM, Werner Macho wrote: Hi! Well to be honest .. I would clip non georeferenced data in gimp .. There you have plenty of options to mask and cut/clip your non georeferenced images .. Unless you have a specific reason to do that in QGIS .. kind regards Werner On Tue, Jun 4, 2013 at 11:59 AM, Alexia Mondot alexia.mon...@c-s.fr mailto:alexia.mon...@c-s.fr wrote: Hello, I've add to QGIS non georeferenced data. It is added in 0,0, north up, south down. So the y is negative. When I tried to extract a part of my data with the clipper, I get an error : Error: Computed -srcwin 266 -145 175 -126 has negative width and/or height. or Computed -srcwin falls outside raster size of 156x144. I understand that it is because the coordinate y is negative and the tool can't match it with the real coordinate. Is there a way to clip a non georeferenced data ? Thanks by advance, Alexia ___ Qgis-user mailing list Qgis-user@lists.osgeo.org mailto:Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
