Hi Killian,

This seems like an oversight, as for WFS MapServer explicity sets the TOLERANCE 
to 0 [1].
The same should be done for OGC Features. Could you raise an issue for this at 
https://github.com/MapServer/MapServer/issues?
Thanks,

Seth

[1] 
https://github.com/MapServer/MapServer/blob/abaa114c6973cc67cacd82e8a724f994a00eb785/src/mapwfs.cpp#L3016

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On Tue, Jun 16, 2026, at 11:42 AM, Kilian Glaus via MapServer-users wrote:
> Hello everybody
> 
> If I have a defined TOLERANCE on the LAYER level of a mapfile, the requested 
> bbox of an OGC API request is increased linear with the size of TOLERANCE. Is 
> this intended or a bug?
> The problem occurs with another EPSG like 4326
> When I do a WFS request with the same bbox, the TOLERANCE is ignored.
> 
> *Request:* 
> `/ogcapi/collections/prozessraum_rutschung/items?f=json&bbox=2678483.5005230373,1286876.7365089145,2680778.0675097415,1287676.7148341944&bbox-crs=http://www.opengis.net/def/crs/EPSG/0/2056`
> 
> *Request without TOLERANCE*
> *Processed BBOX:* POLYGON((2678472.83748642 1286845.70388825,2678472.83748642 
> 1287707.7538654,2680789.0451681 1287707.7538654,2680789.0451681 
> 1286845.70388825,2678472.83748642 1286845.70388825))
> 
> *Request with TOLERANCE 4*
> *Processed BBOX: *POLYGON((2670889.86292488 1275708.25617677,2670889.86292488 
> 1298857.60050378,2688405.20300468 1298857.60050378,2688405.20300468 
> 1275708.25617677,2670889.86292488 1275708.25617677))
> 
> *Request with TOLERANCE 8*
> *Processed BBOX: *POLYGON((2663334.74802645 1264580.34909246,2663334.74802645 
> 1310016.9403732,2696049.18633325 1310016.9403732,2696049.18633325 
> 1264580.34909246,2663334.74802645 1264580.34909246))
> 
> Best regards
> Kilian
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