topic Arcade modify only Z geometry in Attribute Rules Questions

Arcade modify only Z geometry

FlorentChalvet — Thu, 28 Dec 2023 14:34:09 GMT

Hello everyone,

In the exemple below, i can create another point with the Z coordinate of the field "Z_OUV" in stead of the original Z coordinate. But is it possible to modify the current point and not create another one?

if ($feature.Z_OUV == Geometry($feature).z) { return }; var newGeom = Point({ hasZ: true, x: Geometry($feature).x, y: Geometry($feature).y, z: $feature.Z_OUV, spatialReference: { wkid: 4326 } }); var featureID = $feature.OBJECTID; var f = filter(FeatureSetByName($datastore, "WaterDevice"), "OBJECTID = @featureID"); if (count(f) == 0) return $feature.Z_OUV; var featureAct = first(f); return { "result": $feature.Z_OUV, "edit": [{ "className" : "WaterDevice", "updates" : [ { "OBJECTID": featureAct.OBJECTID, "geometry": newGeom } ]} ]}

I tried to just update the "z" in the geometry section, but was met with an error. Is there a way to just modify one coordinate?

"geometry": {"z": $feature.Z_OUV}

Re: Arcade modify only Z geometry

Bud — Tue, 02 Jan 2024 17:14:04 GMT

I remember trying something similar a while back, but I wanted to change the M-values of lines. I’m too rusty to help at this point, but you could check out my old M-value posts:

Re: Arcade modify only Z geometry

MikeMillerGIS — Tue, 02 Jan 2024 17:07:45 GMT

You need to pass back a complete geometry object. So copy your geoemtry(can do this by calling Dictionary(geo) on it, prior to 3.2, you need to call Dictionary(Text(geo))). Modify the Z and then pass that dict into the geometry constructor.

Re: Arcade modify only Z geometry

FlorentChalvet — Thu, 04 Jan 2024 08:49:58 GMT

Hey!

Thanks for the reply. I've checked your old posts, and there was the explanation for why it didn't work.

If geometries are immutable, then I don't think I can modify only one attribute of the geometry...

Re: Arcade modify only Z geometry

FlorentChalvet — Thu, 04 Jan 2024 08:58:38 GMT

Hey! I'm on 2.8 right now. Working with a Dictionary is doable, but I still create a new geometry who has the exact same attributes as the first one instead of modifying the current one.

var newGeom = Dictionary(Text(Geometry($feature))) newGeom['z'] = $feature.Z_OUV newGeom['hasZ'] = true var testGeom = Geometry(newGeom)

I also needed to add a 'hasZ' attribute to the dictionary for it to create a valid geometry.