I have a soil layer overlaying a watershed layer in ArcGIS Pro.
How do I calculate the different types of soil area within the watershed?
I have tried summarized within, but it does not work.
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If you Union the two layers you will have a new layer with separate polygons for each combination of soil and watershed. As a simple example, three soil layers spread across two neighboring watersheds would results in six new polygons: SoilA_WaterA, SoilA_WaterB, SoilB_WaterA, SoilB_WaterB, SoilC_WaterA, and SoilC_WaterB.
You can then calculate the area of these new polygons in your union output using the Calculate Geometry Attributes tool (also available by right clicking in the attribute table). If you need to sum the area of multiple polygons (for example if there are three different patches of SoilA in Watershed A) use the Summarize Statistics tool.