topic Re: Arcade Expression works in Map Viewer but not Field Maps in ArcGIS Field Maps Questions

Arcade Expression works in Map Viewer but not Field Maps

ChrisJRoss13 — Tue, 05 Mar 2024 00:05:14 GMT

I have an arcade expression that works perfectly fine in Map Viewer but when I access the map in Field Maps it always returns "No closest weather station was found within the search distance".

Any help on why this is would be greatly appreciated.

The expression is below:

var searchDistance = 50; // Search distance in kilometers

var weatherStations = FeatureSetByPortalItem(Portal('https://www.arcgis.com'),

'38406bada3104e258fc8b42a2a96581a',

['Temperature_C'],

True

);

var proximityWeatherStations = Intersects(weatherStations, Buffer($feature, searchDistance, "kilometers"));

var minDistance = Infinity;

var closestWeatherStationTemp;

for (var f in proximityWeatherStations){

var weatherDist = Round(Distance(f, $feature, "kilometers"),2);

if (weatherDist < minDistance) {

closestWeatherStationTemp = f["Temperature_C"];

minDistance = weatherDist;

}

// Check if a closest individual weather station was found before accessing its property

if (closestWeatherStationTemp != null) {

return "Closest Weather Station Temperature is: " + closestWeatherStationTemp + " degrees C and is located approximately " + Round(minDistance,0) + " km away.";

} else {

return "No closest weather station was found within the search distance.";

}

Re: Arcade Expression works in Map Viewer but not Field Maps

jcarlson — Tue, 05 Mar 2024 14:38:45 GMT

Are you offline when you use Field Maps? This expression would require access to the internet in order to get information from the weatherStations featureset.

Re: Arcade Expression works in Map Viewer but not Field Maps

ChrisJRoss13 — Tue, 05 Mar 2024 14:40:29 GMT

Yes, all online. I am aware that when you move offline that this functionality does not work.

Re: Arcade Expression works in Map Viewer but not Field Maps

DougBrowning — Tue, 05 Mar 2024 14:45:35 GMT

I think it is from using FeatureSetbyProtalID. Change to FeatureSetByName and use the name from the map. See if that does it.

Re: Arcade Expression works in Map Viewer but not Field Maps

ChrisJRoss13 — Tue, 05 Mar 2024 14:48:08 GMT

The actual hosted feature layer is not contained in the map therefore I cannot use the FeatureSetByName. I have another expression that pulls property information (not contained in the map) that uses FeatureSetByPortalID and it works fine.

Re: Arcade Expression works in Map Viewer but not Field Maps

jcarlson — Tue, 05 Mar 2024 14:50:07 GMT

Curious. I don't see anything obvious in the expression otherwise. We use "FeatureSetByPortalID" functions in Field Maps without issue, but it may be worth adding the layer to the map and testing @DougBrowning 's suggestion just to see.

Are you testing in Field Maps with the same login as you use in the Map Viewer? Could it be a sharing permission set on the absent layer?

Re: Arcade Expression works in Map Viewer but not Field Maps

DougBrowning — Tue, 05 Mar 2024 15:16:27 GMT

Ok next idea is this line (closestWeatherStationTemp != null) change to isEmpty Not sure just null works?

Re: Arcade Expression works in Map Viewer but not Field Maps

jcarlson — Tue, 05 Mar 2024 15:19:00 GMT

Checking null works, at least in other contexts. Wouldn't be the first time there was a notable discrepancy between one version of Arcade and another, though.

Re: Arcade Expression works in Map Viewer but not Field Maps

DougBrowning — Tue, 05 Mar 2024 15:32:34 GMT

Not sure what declaring a var with no value does even? It would not even have a type? Maybe set it to '' instead then check that.

I would use Console and see what closestWeatherStationTemp is getting.

Re: Arcade Expression works in Map Viewer but not Field Maps

jcarlson — Tue, 05 Mar 2024 15:38:02 GMT

Correct, it's just a null, no type. Makes it easier to later just assign values without declaring it over and over inside the loop.

Re: Arcade Expression works in Map Viewer but not Field Maps

ChrisJRoss13 — Tue, 05 Mar 2024 19:11:58 GMT

I modified the code slightly and checked into a few things.

The null check doesn't make any impact.
closestWeatherStationTemp grabs the temperature of the specific station.
I tested adding the hosted feature layer to the map and comparing FeatureSetByName and FeatureSetByPortalID. The FeatureSetByName option works in Field Map. I've attached the same selected feature in AGOL map viewer and field maps showing reference to ByPortalID and ByName.

My most recent code is:

// Define search parameters

var searchDistanceKm = 50; // Search distance in kilometers

// Access weather stations from the Living Atlas

// Source: Environment Canada dataset

var weatherStationsFS = FeatureSetByPortalItem(

Portal("https://www.arcgis.com"),

"38406bada3104e258fc8b42a2a96581a", // Item ID for the dataset

0, // Layer index

["Temperature_C"], // Attributes to include

true // Spatial filtering flag

);

// Find weather stations within the search distance

var nearbyWeatherStations = Intersects(

weatherStationsFS,

Buffer($feature, searchDistanceKm, "kilometers")

);

// Initialize variables to track the closest station

var minDistance = Infinity;

var closestStationTemperature = null;

// Iterate through nearby stations to find the closest one

for (var station in nearbyWeatherStations) {

var distanceToStation = Round(Distance(station, $feature, "kilometers"), 2);

if (distanceToStation < minDistance) {

closestStationTemperature = station["Temperature_C"];

minDistance = distanceToStation;

}

// Output the result based on whether a close station was found

if (closestStationTemperature != null) {

return "Closest Weather Station Temperature is " + closestStationTemperature + "°C and is located approximately " + Round(minDistance, 0) + " km away.";

} else {

return "No closest weather station was found within the search distance.";

}

Re: Arcade Expression works in Map Viewer but not Field Maps

AlexHogan — Fri, 23 May 2025 04:47:19 GMT

Hi @ChrisJRoss13

To confirm using the FeatureSetByName resolved the issue for you?

I am seeing a similar issue that I am troubleshooting now,

Thanks

Alex