Arcade: Returning names of all Counties that intersect Wildfire parimeter

afackler_napsg

I am trying to create a script on a wildfire boundary layer (polygon) that will return the name of every county it touches, so users can select a fire parameter and know what counties are affected. I had this working a while back and I provided what I had below, but now it returns nothing but a blank row. Any ideas? I'm not set on the expression below if there is a better solution.

var counties = FeatureSetByName($map,"USA Counties (Generalized)");
var intersectFires = Intersects(counties, $feature);
var uniqueFires = [];
for (var feat in intersectFires) {
    if (IndexOf(uniqueFires, feat) == -1){
        uniqueFires[Count(uniqueFires)] = [" " + feat.NAME];
    }
}

return uniqueFires

 

jcarlson

I would take a look at the function Push, which handles what you're doing in line 6 a bit more clearly. You could also use Distinct to remove duplicates from an array.

Also, uniqueFires here is an array. If you just want the names, Concatenate could be useful here, to.

Finally, consider using FeatureSetByPortalItem to make the connection to the county layer more explicit.

All together, it might look something like this:

// get the counties layer
var portal = Portal('https://arcgis.com')
var counties = FeatureSetByPortalItem(
    portal,
    '7566e0221e5646f99ea249a197116605',
    0,
    ['NAME']
)

// intersect feature with counties
var xs = Intersects(
    $feature,
    counties
)

// create array of intersected county names
var c_array = []

for (var c in xs){
    Push(c_array, c['NAME'])
}

// remove duplicates
var unique_counties = Distinct(c_array)

// concatenate array, return string

return Concatenate(unique_counties, ', ')

 

And here's what it looks like in action: