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multiple shapefiles colored black with 50% transparency. As you can see there are areas with one, two, and even three overlapping shapefiles.I have a dataset with several hundred shapefiles and need to ensure that there is at least double overlap throughout. I need a way to extract the areas without double overlap, or at least a way to color by number of overlapping shapefiles.

The image is of multiple shapefiles colored black with 50% transparency. As you can see there are areas with one, two, and even three overlapping shapefiles. With the 50% transparency, you can see the gaps with only single overlap, and I could manually delineate them, but I am looking for a way to do it automatically.

  • Welcome to GIS SE! As a new user please take the tour. What do you mean by "double overlap"? Could you please edit your question to include a description of your data, and perhaps a screenshot showing what you mean? – Midavalo Oct 21 '16 at 20:34
  • Thanks for the feeback Midavalo, let me know if this makes more sense. – McFraser Oct 21 '16 at 21:23
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    This is a basic application of the Union operation. Merge them together, count the presence of data, and extract those with less than two sources. – Vince Oct 22 '16 at 0:51

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