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Attribute rule to calculate count of features within a buffer of another feature

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06-27-2023 11:19 PM
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AdministrátorJihlava
New Contributor III

Hello everyone!

I got stuck with an arcade issue and it's really driving me crazy. 

What i need to do is following. I've got two  point layers lets say pts_1 (square, hnizda in code) and pts_2 (circles, nadoby in code). PTS_1 is superior to pts_2.  There is always one point in pts_1 for many points in pts_2 (pts_1 (red square) represents something like nest for another layer (colorfull circles)). I need an attribute rule to calculate count of circles around a square feature, if a circle is added, deleted or updated. This count should be written to pts_1 layer to a specific field. 

AdministrtorJihlava_0-1687932418043.png

I tried this code but I'm still getting this error message: Attribute rule returned a value but no field was specified in the rule. The attribute rule is performed within a pts_2 layer, because pts_1 layer is static.

var nadoby = FeatureSetByName ($datastore, "nadoby_b", ["GlobalID"],true);
var hnizda = FeatureSetByName ($datastore, "hnizda_b", ["GlobalID"],true);

var fs_polygons = Buffer(geometry(hnizda),25, 'meters');
var updates = []

if (fs_polygons !=null){

var point_count = Count(Intersects($featureset, fs_polygons));
console ("Point_count: "+point_count)

if($editcontext.editType == "DELETE") {
// $feature is still there when this rule is executed, so we have to substract 1
point_count -= 1
}
Push(updates, {globalID: $feature.GlobalID, attributes: {"plast1": point_count}})




if ($editContext.editType == "INSERT") {
var point_count = Count(Intersects($featureset, fs_polygons))
Push(updates, {globalID: $feature.GlobalID, attributes: {"plast1": point_count}})
}
}

return {
edit: [{className: "hnizda_b", updates: updates}]
}

 

I will be gratefull for any help.

 

Thanks in advance.

 

Jana

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