topic Re: ProjectOperator removes zValues of geometries in ArcGIS JavaScript Maps SDK Questions

ProjectOperator removes zValues of geometries

ChristopheSuter — Fri, 20 Feb 2026 10:02:12 GMT

At version 4.34, using projectOperator on geometries with z values fixes all its z values to 0!

Anyone has a workaround for this ?

Re: ProjectOperator removes zValues of geometries

Sage_Wall — Fri, 20 Feb 2026 15:44:21 GMT

Do both spatial references have the same vertical coordinate system and only differ in their horizontal coordinate system? There is a known limitation where vertical coordinate system projections are not currently supported. This should be better documented when version 5.0 comes out next week.

Re: ProjectOperator removes zValues of geometries

AndyGup — Fri, 20 Feb 2026 15:47:13 GMT

@ChristopheSuter can you provide a repro sample?

Re: ProjectOperator removes zValues of geometries

ChristopheSuter — Fri, 20 Feb 2026 17:42:51 GMT

Hi Sage,

No, both spatialReferences have same vcsWkids equal to null, but thanks for the upcoming info

Re: ProjectOperator removes zValues of geometries

ChristopheSuter — Fri, 20 Feb 2026 18:10:04 GMT

Yes but it does not help, since it works correctly: https://codepen.io/christophesuter/pen/WbxVEvq since creating the geometry from its json solves it. Difficult for us to see why it works with a new instance of the geometry
I have adapted my projection method like this .. but it is still a workaround i think

export function project(geometry, spatialReference) {

if (!geometry) {

return geometry;

}

if (Array.isArray(geometry)) {

geometry = geometry.map((currentGeometry) =>

geometryJsonUtils.fromJSON(currentGeometry.toJSON())

);

return projectOperator.executeMany(geometry, spatialReference);

}

geometry = geometryJsonUtils.fromJSON(geometry.toJSON());

return projectOperator.execute(geometry, spatialReference);

}

If i can inspect more properties just tell me ...
Christophe

Re: ProjectOperator removes zValues of geometries

AndyGup — Fri, 20 Feb 2026 23:39:36 GMT

@ChristopheSutergotcha. How are your non-new instance geometries being created when they have the z-problem?

If converting them to JSON is correcting the problem then it's possible there is some sort of issue with the non-JSON geometry instances. If you continue to have issues, or run into convert/revert performance issues, then I'd encourage you to open a support ticket so we can take a deeper look.

Re: ProjectOperator removes zValues of geometries

ChristopheSuter — Sat, 21 Feb 2026 14:09:54 GMT

Found some strange way to correct the problem, maybe it can help. I am using a polylineGeometry returned by the sketchViewModel with :

defaultCreateOptions: {

hasZ: true,

mode: 'click'

in a 2d mapview. Then i use this geometry (that is in EPSG:2056, and has all of its z values to 0 that seems logic) to query elevation on Esri's elevation service (that is in EPSG:3857), so i use the projectOperator to reproject my geometry and then query Elevation on esri's elevationLayer. Everything ok, elevation z fixed and x/y in EPSG:3857.
Then I have to reconvert it to EPSG:2056 -> sets all the z to 0.
So I modified the sketchViewModel property (removed hasZ):

defaultCreateOptions: {

mode: 'click'

},
that means that now when querying the elevationLayer the geometry has no z value it works ... any caching that could cause this ?