I am validating shapefiles polygon geometry using shapely, and have also attempted it using FME. Some polygons return the error "Nested Shells".

I cannot find a definition of what the problem is, whether in FME documentation (here) or in google search results on shapely or OGC geometry validation.

Would anyone have a definition or (ideally!) a graphic example?


A Nested Shell is a polygon on top of another polygon.

Nested shell

Image source

  • OK, many thanks!! It sounded to me like something way more complicated, but this is easy to address. – Hélène Nov 25 '15 at 8:47

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.