[Qgis-user] Problem using DIFFERENCE

[Werner Macho]

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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.
> 
> 
> 
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