Update point geometry based on polygons centroid

370
5
07-29-2022 10:56 AM
Jake_S
by
Occasional Contributor II

I've got a strange one for you folks. Working with some address points and parcel polygons, is it possible to get the x and y geometry from a centroid of an intersecting polygon?

I followed this documentation and the way the author's script works great when replicating the author's scenario. Yet when I try to get the centroid of a polygon I get an error 'Expected convertable to geometry'.

Basically, I'm trying to update the geometry of a point on intersect based on the centroid geometry of the intersecting polygon

 

//This calculation attribute rule is added to the shape field of a point feature $feature
var parcels = Intersects(FeatureSetByName($datastore, "Parcel", ["*"], true), $feature)
var parcelCentriod = Centroid(parcels)
if (!IsEmpty(parcelCentriod)) {
    var x0 = Geometry(parcelCentriod).x
    var y0 = Geometry(parcelCentriod).y
    var addressPoint = Point({
        "x": x0,
        "y": y0,
        "z": 0,
        "spatialReference": Geometry(parcelCentriod).spatialReference
    });
    return addressPoint
}
return{
    "errorMessage": Text('Something Went Wrong')
}

 

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5 Replies
jcarlson
MVP Esteemed Contributor

Intersects returns a FeatureSet. Centroid requires a Feature.

Add something like

var parcel = First(parcels)

between lines 2 and 3, then have your Centroid function use parcel as its input.

Does that help?

- Josh Carlson
Kendall County GIS
Jake_S
by
Occasional Contributor II

Josh thanks for the advice. I tried that in the past. Here is the new error....

JS_Esri_0-1659121057582.png

 

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jcarlson
MVP Esteemed Contributor

So, that means that there's nothing in the intersection.

Instead of checking IsEmpty on the centroid, check first on the parcels FeatureSet.

if(Count(parcels) < 1){
Console('No intersecting parcels')
// return some default message
} else {
parcel = First(parcels)
var parcelCentroid = Centroid(parcel)
... etc
}

 

- Josh Carlson
Kendall County GIS
Jake_S
by
Occasional Contributor II

The same error occurs just in the else statement. So it sees the intersection, 

JS_Esri_0-1659126005126.png

Some reason just having an issue with getting the centroid geometry still. Not sure this is even possible. 

Thanks for your help though!!!

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MikeMillerGIS
Esri Frequent Contributor

Can you post a sample dataset with the rule?

Couple things: 

  - In this case, I would not call Count.  Count can be expensive, as it makes a query to the FS.  Best to just call First or loop over the FS and exit on the first record

  - I do not like reusing the variable parcel to be the FeatureSet and the Feature.  Change the first item to var parcelFS

  - If you right click in the expression, you can turn on line numbers.  Will help identify which line has the error