Hey,
I am planning to create something like a biodiversity map on ArcGIS Pro. For that purpose I downlaoded the shapefiles for the range of various species, in form of polygons. Now I am planning to merge all this data together. Basically, what I am trying to do is to colour the map differently depending on how many layers (polygons) are overlaying in one area (e.g. the more overlay the redder). Meaning I am trying to show how many species are found in a certain area. Is there any tool that can do this. I was playing a round for a while but didn't find anything.
On top of this I would also like to include the RedList threat level for every species (i.e. layer) in the attribute table, in form of numbers the higher the more endangered. With those I then would liek to create a second map showing the accumulated threat level in certain areas, so once again showing different colour (e.g. the higher the accumulated threat level the redder the area). Generally I have amn idea how to do it but I would first have to create those overlapping layers, and then I would be wondering how to calculate the accumulaed threat level number.
I hope everything is clear and someone can help me out.
Thanks a lot,
Mo
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Hi Mo
Hi Mo
Hi Mervyn,
Thanks a lot! I just had to update my GIS and then I found the tool and it worked really well. Do you have an idea how I could include the threat level in this as well. Like for every species layer (polygon) I have the threat levle as a number in the attribute table. If they were Rasters I could simply do Raster calculation but since they are Polygons I do not know how to add the values together. Also I would then need to display how high the accumulated threat level of the overlaying layers is, rather than showing how many layers are overlapping.
Thanks a lot,
Mo
Hi Mo
I am not sure exactly what you mean by threat level but I suspect it may be something along the lines of, hypothetically: Critically Endangered (CR) = 20, Endangered (EN) = 10, Vulnerable (VU) = 5, Near Threatened = 1. If so, then I suggest you try:
Is this what you are looking for?
Good luck and let me know if it worked or if you require a different process and I misunderstood your need.
I do think this process may be easier in raster.
Mervyn
Hey Mervyn,
Yes exactly basically how endangered which species is.
Thanks a lot I basically followed your advice just tweeked it a bit. I left out the count overlap in the beginning. Because I want to produce two maps. One for how many species can be found in an area (for this I use the count overlap tool) and then one map with the accumulated threat level of all species in one area (e.g. S1 (lv. 3) + S2 (lv.4) + S3 (lv.3) + S4 (lv.2) + S5 (lv.2)). So if I would use the count overlap before hand and combine all species from one threat level I assume I could not add up the threat levels of each species invidually anymore? Either way also just doing the Union and then the Field Calculator gave me exactly the result I needed.
Thanks so much for your quick and amazing help!
All the best,
Mo
Excellent, glad it worked.