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My aim is to calculate catchments for around 150 points and to extract land-use variables for them. In order to do so I need a vector dataset where no polygons overlap. This, however, seems to be a challenging task.

Presume, that I already calculated the catchments for all 150 points (see Figure 1; here only points 1-6 are visualized):

  • How do I get from the overlapping catchment features in Figure 1 to the none overlapping catchment features in Figure 2?

  • How can I associate the catchment features to previous overlaps? I thought of adding up the IDs (see 'Sum ID Overlap' in the attribute table in Figure 2). Can this be done automatically?

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  • What GIS software are you using to try and do this? – PolyGeo Aug 22 '15 at 7:35
  • I momentarily have access to QGis and ArcGIS. But I am also open to other solutions. I am thinking about calculating the catchments with Whitebox (whiteboxgeospatial.wordpress.com/2014/05/04/…) or Grass (which I am not familiar with and would have to learn) – kalakaru Aug 22 '15 at 7:39
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    I think you should choose one to focus your question on. Otherwise this will be too broad for our focussed Q&A format. – PolyGeo Aug 22 '15 at 8:52
  • If this can be easily done with QGis then I would prefer this solution. If not, ArcGIS will do. – kalakaru Aug 22 '15 at 8:58

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