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I'm trying to simplify polygons in a shapefile using the "Simplify Geometries" tool in QGIS 2.10 (Pisa). This works as expected, except for one strange effect: the resulting features (shown in green) are slightly shifted to the north:

enter image description here How can I avoid this?

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    does the pre-processed shp have a defined CRS? – artwork21 Nov 3 '15 at 19:20
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    @artwork21: it did not, and this was the problem. Care to make that the answer? – kontextify Nov 3 '15 at 20:25
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As my comment noted, make sure you define your layers CRS before running the Simplify Geometries tool to avoid feature shift.

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