problems with Erase tool

07-13-2016 05:11 PM
New Contributor II

I am using the erase tool to remove the area covered by one feature class (269 sq mi) from another feature class (1617 sq mi). 1617-269 = 1348. However, the result of the erase gives me a feature class that covers 1391 square miles. I expect a little discrepancy, but 43 square miles difference seems like a lot to me. The the only setting for the erase tool is XY tolerance, which I have played with, but it has not helped me. Is there anything that I can do about this?

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4 Replies
MVP Legendary Contributor


Can you delete all your duplicate posts.  I will move this to managing data where it will get some attention.  In the future you can use the 'Share' option to the upper right of your post... it will get shared and not make duplicates.

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New Contributor II

Sorry about that. Thanks for this info. Wasn't sure how to make a post so it was viewed by a wider audience.

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MVP Esteemed Contributor

Make sure both the data have same projection system (Projected Coordinate System) along with the output feature class.

Think Location
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Occasional Contributor III

Make sure that :

The Erase feature is totally within Input feature.

You can use intersect tool for the two feature classes and check  geometry area.

Finally calculate the area for Erased feature or intersect feature according to same projection along with input feature and erase feature and data frame.

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