ArcGIS Pro "Summarize Within" Geoprocessing Tool Giving Incorrect Results

06-06-2019 06:41 PM
MVP Regular Contributor

I have run the "Summarize Within" GP tool in ArcGIS Pro 2.3.3 and it seems to be giving incorrect results.  The input is a Parcel feature class with a definition query applied to only show one parcel.  The summary polygon feature class is representing a site that also has a definition query applied.  After running the "Add Geometry Attributes" GP tool, the [POLY_AREA] field reads '124999.66403816' (see image 1).  But, after running the "Summarize Within" tool, the summary area found in the result table reads '125018.31814394'.  Does anyone have any idea why?

1.) Before running "Summarize Within" with inputs

2.) Result table after "Summarize Within" tool is complete

1 Reply
New Contributor

Hi Mitch,
looks like you have a similar problem with the tool as I do.
In a test I found that calculating areas with "Add shape summary attributes" gives a different result than the "Summary Fields" > Sum "Shape_Area" method in the same tool.
The result with the method "Add shape summary attributes" (which you also used) is definitely wrong. Only with the method "Summary Fields" > Sum "Shape_Area" the correct result is output (see screenshot).
How can it be that when using Summarize Within 2 different results are output?
Are different calculation methods used here for the area calculation?
Is this a bug?

I use ArcGIS Pro version 2.8.3
The coordinate system used in the map and the polygons stored in a file geodatabase is UTM Zone 32N (EPSG:25832).

Best regards from Berlin

Translated with (free version)


Screenshot summarize.jpg

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