Question about overlap or gap when clipping geometries

frankm — Thu, 04 Dec 2025 11:33:30 GMT

Hi!

I am trying to debug a method we are using in order to clip a geometry with another. We have this feature in our app where when the user creates a new geometry, they have the option to clip the new one with an existing one so that there are no overlaps.

We are using something like this:

GeometryEngine.intersection(geometry, mainGeometry)

The resulting geometry we then save looks just what we wanted. However, when I zoom (a lot) on the intersection, I see there is either a small gap or an overlap.

As you can see, the overlap is quite small, and I just wonder if this is a precision issue, either with the projection or data?

We are using a WKID like this:

WKID 25833, which would be UTM Zone 33N, if I am not mistaken.

For very large geometries, this overlap accumulates and becomes a problem later on. It would be great if there was a way to address this. Any advice appreciated.

Re: Question about overlap or gap when clipping geometries

Ting — Fri, 17 Apr 2026 22:21:15 GMT

Loop back on this… I don't have a good answer on what exactly caused your problem. However, in 200.8, we introduced customizable precision for a spatial reference. Maybe you can try to set the tolerance to a smaller value and see if the GeometryEngine gives the result you want. Let us know the result if you have some time to try it out. 🙂

topic Re: Question about overlap or gap when clipping geometries in Swift Maps SDK Questions

Question about overlap or gap when clipping geometries

Re: Question about overlap or gap when clipping geometries