Intersect polygon and return max value

Question

Hard to believe I have to create a post for this, seems like something google should find.  If a field user draws a polygon that intersects multiple rows, from the same underlying feature, how do I return the maximum value from those rows?

Example screenshot below.  User draws red polygon.  Field calculation returns 9.

jcarlson · Accepted Answer

It's certainly the sort of thing that's been posted here before. Try something like this:

// get polygons layer
var poly = FeatureSetByName($map, 'your layer', ['numeric_field'])

// subset intersecting features
var xs_poly = Intersects($feature, poly)

// look for highest value
return Max(xs_poly, 'numeric_field')