[Qgis-user] Problem using DIFFERENCE

[Susan Iremonger]

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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