topic Re: Nearest Address Calculation Expression in Field Maps Smart Form in ArcGIS Field Maps Questions

Nearest Address Calculation Expression in Field Maps Smart Form

OliverSandoval_p — Tue, 24 May 2022 20:04:39 GMT

Hello,

I am attempting to auto calculate a field in the Field maps smart form for a hosted feature layer using the new arcade calculation capability. Using the solution provided here Solved: Using Arcade to Find the Nearest Address Point - Esri Community I kept getting wrong and inconsistent results for the nearest address. So I have now switched to making a dictionary and converting it into a feature so I can sort the buffer intersecting addresses by distance to get accurate results. Now I am just receiving null values

Our feature services are in nad 1983.

Here is my code

Any advice would be greatly appreciated!!

EDIT: I am able to view the dictionary successfully, but cant figure out how to sort and return it as a featureSet

Re: Nearest Address Calculation Expression in Field Maps Smart Form

Anonymous User — Fri, 27 May 2022 15:37:37 GMT

@OliverSandoval_p Try something like this:

// If feature doesn't have geometry return null if (IsEmpty(Geometry($feature))) { return null } // Get the parcels layer var parcels = FeatureSetByName($map, 'Parcels') // Buffer the current location and intersect with parcels var bufferedLocation = Buffer($feature, 100, 'feet') var candidateParcels = Intersects(parcels, bufferedLocation) // Calculate the distance between the parcel and the current location // Store the feature and distance as a dictionary and push it into an array var featuresWithDistances = [] for (var f in candidateParcels) { Push(featuresWithDistances, { 'distance': Distance($feature, f, 'feet'), 'feature': f } ) } // Sort the candidate parcels by distance using a custom function function sortByDistance(a, b) { return a['distance'] - b['distance'] } var sorted = Sort(featuresWithDistances, sortByDistance) // Get the closest feature var closestFeatureWithDistance = First(sorted) // If there was no feature, return null if (IsEmpty(closestFeatureWithDistance)) { return null } // Return the address return `${closestFeatureWithDistance['feature']['ADDNUM']} ${closestFeatureWithDistance['feature']['ADDRESSNAM']}`

I think you were pretty close. You don't need to create a feature set, you can just create an array of objects and then use a custom sort function sort by distance, then access the attributes for that feature to generate the address.

Re: Nearest Address Calculation Expression in Field Maps Smart Form

OliverSandoval_p — Thu, 30 Jun 2022 23:40:56 GMT

Hi Aaron,

Sorry for the late reply! I was able to figure out that the Web Map needed to have its projection changed by adding a service as a basemap with a different projection than web Mercator in order to match the layers' NAD 1983. I ended up using my original code based off the solution in the original post, but I had to reupload the hosted feature layers as Web Mercator.

Making sure everything in a workspace including the map is in the right projection is one of the most critical steps, but its something I wasn't familiar with in terms of ArcGIS Online jiminey crickets!!!

Thank you for your taking the time to make the solution!

Best,

Oliver