topic Re: ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation in Python Questions

ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation

SU00861536 — Mon, 29 Aug 2022 06:11:42 GMT

Hi, I want to implement immediate attribute rule on $editContext.editType for "UPDATE" to generate a new parcel id on splitting of polygons and merging of polygons but not able to find split & merge event in ArcGIS Aracade Expression. I found that Cut(polylineOrPolygon, cutter) is available for ArcCade Expression. Please if anyone have any idea about ... please share.

Re: ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation

JohannesLindner — Mon, 29 Aug 2022 10:18:06 GMT

The Cut() function is for cutting geometries, not for detecting cuts.

$editcontext.editType only returns "INSERT", "UPDATE" or "DELETE". There is no way to trigger the rule only on a merge or cut operation.

A possible workaround could be to detect changes in the geometry:

// Attribute rule to calculate parcel id // triggers: insert, update var geometry_changed = $editcontext.editType == "UPDATE" && !Equals(Geometry($feature), Geometry($originalfeature)) if($editcontext.editType == "INSERT" || geometry_changed) { var new_id = ... return new_id } // If we land here, the feature got updated, but the geometry didn't change return $feature.ParcelID

But this will calculate a new ID everytime you edit the geometry. So it will only work if cutting and merging are the only geometry edits you do.

Re: ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation

SU00861536 — Tue, 30 Aug 2022 06:07:09 GMT

Thanks for the reply.

I am planning to generate new id on the basis of split (UPDATE TRIGGER) assigning new id using the parent id eg: Polygon ID : 0070 -- Splitted in to two parts so splitted polygon id will be -- 1) 0070_01 and 2) 0070_02.

Same for merging the two polygons 1) 0070_01 2) 0070_02 and assign new id 0071( merged polygon).

I want to find the Split or Merge operation in Arcade expression.

Kindly share some idea to differentiate in Split & Merge operation at Arcade ( already tried Geometry equal & object id equal)

Re: ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation

JohannesLindner — Tue, 30 Aug 2022 15:16:44 GMT

This is a way you could handle a split.

// Attribute Rule // field: ParcelID // triggers: Insert // Exclude from Application Evaluation // An Insert can be a "normal" insert or a Split operation var id = $feature.ParcelID var gid = $feature.GlobalID // no ParcelID -> normal insert, create and return a new ParcelID if(id == null) { var new_id = NextSequenceValue("SequenceParcelID") return new_id } var other_parcels = Filter($featureset, "ParcelID = @ID AND GlobalID <> @gid") // no other parcels with the same ParcelID -> normal Insert. if(Count(other_parcels) == 0) { return id } // else, it's a Split operation // create and fill an array of updates to the other split parts var updates = [] var i = 2 // this $feature gets id 1 for(var op in other_parcels) { var new_id = op.ParcelID + "_" + Text(i++, "00") Push(updates, {globalID: op.GlobalID, attributes: {ParcelID: new_id}}) } return { result: $feature.ParcelID + "_01", // the new ParcelID of this feature edit: [{className: "TestPolygons", updates: updates}] // apply the edits to the other split parts !!! CHANGE THE CLASSNAME !!! }

I have looked for a way to detect merges, but I haven't fond one, yet.

You could just add this Attribute Rule:

// Attribute Rule // field: ParcelID // triggers: Update var id = $feature.ParcelID if(id == null) { var new_id = NextSequenceValue("SequenceParcelID") return new_id } return id

And then delete the ParcelID in the Merge dialog:

Re: ArcGIS Attribute Rule $editContext.editType for Split and Merge Operation

SU00861536 — Thu, 01 Sep 2022 05:23:12 GMT

Thanks. I will check and update you