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I want to intersect contours with polygon like in the image below. But I got this error:

Warnings:
GEOS geoprocessing error: One or more input features have invalid geometry.
Some output geometries may be missing or invalid.

I don't know what's wrong with my geometries. I even don't know, where to search. I tested it also with a simple single-line. Same thing happened. The result: a empty shapefile

enter image description here

What should I do now? Where can I expect an invalid geometry? Or is it because of the shapefile (OGR ESRI)? Please help!

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    Have you tested the validity of the contours and the polygon layer? (Vector - Geometry tools - Check geometry validity) It should show where the problem is located.
    – underdark ♦
    May 25, 2012 at 8:35
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    No errors found! But I do it now with ogr2ogr: gis.stackexchange.com/questions/25996/…
    – MartinMap
    May 25, 2012 at 11:11

3 Answers 3

Reset to default
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I have encountered the same problem elsewhere. Reset the CRS. Go to Settings>Project Properties> CRS and Set a Reference system again. This should do the job. If not, export it as an ESRI shapefile.

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I just had this error, and re-projecting did not solve the problem. I also ran the Validity tool, and there were no errors. I ran previous intersections with one of the files, so I suspected the new file was causing the problem. I saved it as geojson, then it worked. Not sure why, but it worked.

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The problem are cross nodes in the shapefile, it's need to edit the shape. Firstly, select the shapefile and go in toggle editing > node tool, then select the shape and a different point will arise, delete or undo the node.

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