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Calculating the areas of polygon located inside a target polygon

I have two polygon shape files that represents the building footprints and the plot. I want to calculate the plot ratio (area of built/area of the plot). I used spatial join with sum function, but summing up the area of the polygons that located inside one plot is not calculted correctly. Any idea how to do that in arcmap?

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DanPatterson_Retired

Do you have sample results?

An example showing the calculation versus the expected would help.

And both files are in the same projected coordinate system?

can you send me your email

DanPatterson_Retired

You can post here, the questions I asked don't require a separate email thread

the Plot_Ratio shows the calculated value with spatial join tool and the Actual_PL is the real values.

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