topic Re: Reference a layer in map using Arcade in Developers Questions

Reference a layer in map using Arcade

Justin_CLT — Tue, 27 Aug 2024 12:51:40 GMT

I'm trying to write a field calculation expression in Arcade that will populate a value in the field of a point feature using a value from the intersecting polygon from another feature class in the same map. The documentation I've seen shows to reference a layer in the same map using either $map or $layer. I've tried both of the lines below, but neither are working and give me an object not found error.

var dem = FeatureSetByName($map, “Elev_Polygons_2023”, “FieldName = ‘gridcode’”);

var dem = FeatureSetByName($layer, “Elev_Polygons_2023”, “FieldName = ‘gridcode’”);

Here is the full expression so far:

// Reference the current device feature

var device = $feature;

// Retrieve the DEM polygons feature set

var demFeatures = FeatureSetByName($layer, "Elev_Polygons_2023", ["gridcode"], true);

// Find the polygons that intersect with the current device

var intersectingPolygons = Filter(demFeatures, 'Intersects($feature)');

// Get the first intersecting polygon

var intersectingPolygon = First(intersectingPolygons);

// Extract the gridcode value if an intersecting polygon exists

var elevation = intersectingPolygon["gridcode"];

// Return the elevation value

return elevation;

Re: Reference a layer in map using Arcade

jcarlson — Tue, 27 Aug 2024 12:55:08 GMT

Where are you trying to use this expression? Referencing other layers with Arcade functions a little differently in ArcGIS Pro compared to the web.

If the DEM polygons are a published service, I'd suggest using FeatureSetByPortalItem instead, as it will work regardless of whether the layer is present in the map, and works the same in Pro or the web.

Re: Reference a layer in map using Arcade

Justin_CLT — Tue, 27 Aug 2024 12:58:26 GMT

I'm using it in a field calculation in Pro. The Elev_Polygons_2023 feature class is in a file geodatabase.

Re: Reference a layer in map using Arcade

jcarlson — Tue, 27 Aug 2024 13:16:54 GMT

Any chance the layers are in the same geodatabase? You could try using $datastore in the FeatureSetByName, rather than $layer or $map.

Re: Reference a layer in map using Arcade

Justin_CLT — Tue, 27 Aug 2024 13:21:35 GMT

They are not in the same geodatabase.