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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
    Commented Nov 3, 2015 at 19:20
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    @artwork21: it did not, and this was the problem. Care to make that the answer?
    – kontextify
    Commented Nov 3, 2015 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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