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I need to create maps of multiple species in a certain area. However sometimes multiple species occurr in the exact same area. This results in two identical polygons on top of each other. Many of these polygons are for example a UTM1 square of 1 by 1 km.

When making a map I should be able to make it clear that there are multiple species that occur in that polygon. However through the syles menu I can only make the colors blend while ideally when 3 polygons are on top of each other I should get some sort of pie diagramm or a checkerboard pattern containing the colors of both species.

Does anyone know a plugin or elegant way to do this? So far I have only found stuff like the v.clean option, but I do not want to remove the overlapping polygons, quite the opposite, I want to visualise the overlapping polygons as well as the non-overlapping ones with a clear legend.

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    What is the maximum amount of different species you have in one region? – Matthias Kuhn Jun 7 '16 at 12:07
  • I'd say it will be around 4 but the total amount of squares for which I have more than one is quite high so a manual job is not really an option. – Hannes Ledegen Oct 5 '16 at 13:38
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I have created 3 polygons called Deer Lions Bears, and used the Tranparency slider on the colour. enter image description here

the transparent colours show which polygons overlap

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Have you considered just adding own layers for regions where multiple species occur? For example, if you have the species A which is visualized green, and the species B which is visualized red, just make the regions where both of them occur blue. Might be a bit too simplistic, but it works in my mind.

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