-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi!
Which version of QGIS are you using and with which OS? (Might help in finding the cause of troubles). But my first guess is that those two layers do not have the same projection. Using and applying algorithms (functions) to layers you should always make sure that the layers are in the same CRS and projection. Though it might work with OTF switched on - it is always better and a sure way to compare them in the same CRS. If this still does not work .. Version and OS would be helpful (and probably some sample to reproduce) regards Werner On 04/01/16 13:31, Susan Iremonger wrote: > Hi I am having trouble erasing part of a file by using another file > as a mask and the tool Difference. I have a habitat map and I want > to erase the part of the habitat map that is within a conservation > area. So I have two shapefiles, one of habitats polygons and the > other of conservation area polygons. I have tried using Difference, > but it doesn't work, it has left me with the same data as the input > file. Does anyone know of a fix for this that might work? I have > tried doing this a different way, using Select etc, but I can't > seem to do it. Any help much appreciated. Many thanks. --Susan. > > > > _______________________________________________ Qgis-user mailing > list Qgis-user@lists.osgeo.org List info: > http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: > http://lists.osgeo.org/mailman/listinfo/qgis-user > -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlaLgSIACgkQDAH1YiCxBgkxKwCfaHD1nGJIpUk5frCysQyrXgTs EwcAnj3YvquXlanM50xX58vk+9uxwSRm =syue -----END PGP SIGNATURE----- _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
