Why is my Arcade Intersects Expression not returning consistently correct results?

AlaskaDepartment — Thu, 07 Jan 2021 18:45:18 GMT

I've written an Arcade Pop-Up expression that uses the Intersects function to return "Intersecting" or "Not Intersecting" based on whether a point feature intersects a polygon feature. I am getting varied results, with multiple cases of the Pop-Up returning "Not Intersecting" when the point is clearly intersecting a polygon feature. In my attached photo, the salmon colored area is a polygon, the white color is outside the bounds of the polygon.

Pop-up expression:

```
var geom1 = $feature;
var geom2 = FeatureSetByName($map,"Groundwater Plumes");
var intersectLayer = Intersects($feature, geom2);
var cnt = Count(intersectLayer)
var plume_int = " "

if (cnt >= 1) {
for (var f in intersectLayer){
plume_int = "Intersecting"
}
} else {
plume_int = "Not Intersecting"
}
return plume_int;
```
[![example of intersect error][1]][1]

[1]: https://i.stack.imgur.com/UxTvR.png

Re: Why is my Arcade Intersects Expression not returning consistently correct results?

XanderBakker — Sat, 09 Jan 2021 20:52:17 GMT

Hi @AlaskaDepartment ,

I think the problem is in the intersects function. You need to specify the plumes featureset as first parameter and the current feature as second parameter. Try this:

var poi = $feature; var plumes = FeatureSetByName($map, "Groundwater Plumes"); var intersectLayer = Intersects(plumes, poi); var cnt = Count(intersectLayer); var plume_int = ""; if (cnt >= 1) { plume_int = "Intersecting"; } else { plume_int = "Not Intersecting"; } return plume_int;

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Why is my Arcade Intersects Expression not returning consistently correct results?

Re: Why is my Arcade Intersects Expression not returning consistently correct results?