Am 25.01.2015 um 13:51 schrieb Zoltan Szecsei:



So, does anyone know of a way to efficiently cut features in multiple
layers using a polygon, and then to be able to select the pieces
(multiple layers) that are either inside or outside the polygon, and
then delete them?


Disregarding the "multiple":

"Vector -> Geoprocessing -> Clip" deletes the items outside the polygon
"Vector -> Geoprocessing -> Difference" deletes the items inside the polygon

You would have to do it for every layer you want to be cut, the dialogue box will stay open after cutting. If the polygon layer contains just one polygon, no selecting is necessary.

BTW: make sure all layers share the same CRS (i.e. turn on-the-fly-reprojection off)

HTH,
André Joost


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