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Detecting Gaps and slivers between polygons of 2 different shapes

  • February 1, 2022
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franco69
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I have polygons of two different shape files and would like to have a possibility that FME shows me (either with an attribute or with a flag or geometry) where there are gaps oder overlaps between both...the poylgons should have the same geometry but they haven't the same area.....the second shape is only a part of the first.i have tried some overlayers, intersectors or other transformer but none of them gives me that i want...i think its a combination of some transformers.

i don't want to repair the polygons only find these errors!

Any helps?

Thx

Franco

Best answer by redgeographics

Have you tried the AreaAndGapOverlapCleaner? It'll repair gaps and overlaps, but if you for example use a GeometryExtractor before and after it (to 2 different attributes) you can see if areas have been changed.

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3 replies

franco69
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  • franco69Contributor
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  • February 1, 2022

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redgeographics
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  • February 1, 2022

Have you tried the AreaAndGapOverlapCleaner? It'll repair gaps and overlaps, but if you for example use a GeometryExtractor before and after it (to 2 different attributes) you can see if areas have been changed.

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mark2atsafe
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  • mark2atsafeSafer
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  • February 4, 2022
redgeographics wrote:

Have you tried the AreaAndGapOverlapCleaner? It'll repair gaps and overlaps, but if you for example use a GeometryExtractor before and after it (to 2 different attributes) you can see if areas have been changed.

Yes, I think this transformer is the way. There is a whole tutorial on data cleanup and validation on the knowledge base, and this is probably the relevant article: https://community.safe.com/s/article/data-qa-identifying-slivers-overlaps-and-gaps-in-p

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