topic The nearest school district calculation in Attribute Rules Questions

The nearest school district calculation

Robswann — Tue, 24 Aug 2021 13:51:43 GMT

Hello I am working on a calculation rule that inputs the nearest school district from a polygon feature. The problem I am having is that the rule is bringing back the school district that the polygon is within. I would like it to calculate the nearest (if any) school district within 1 mile. Is this possible. I have the following below.... Thanks in advance.

var SCHOOL_DIST = FeatureSetByName($datastore, "SCHOOL_DIST", ["NAME"]);
VAR SEARCHDISTANCE = 1;
VAR SCHOOLINTERSECT = INTERSECTS(SCHOOL_DIST, BUFFER($FEATURE, SEARCHDISTANCE, "MILE"))
VAR FSCHOOL = FIRST(SCHOOLINTERSECT)
IF (FSCHOOL == NULL) RETURN ""
RETURN FSCHOOL.NAME

Re: The nearest school district calculation

JohannesLindner — Tue, 24 Aug 2021 14:43:48 GMT

So you create a feature inside a school district (polygon) and want to return the name of the next district within 1 mile that is not the district the feature is in. Did I get that right?

var school_districts = FeatureSetByName($datastore, "SCHOOL_DIST", ["NAME"], true); var search_radius = Buffer($feature, 1, "Mile") var districts_within_search_radius = Intersects(school_districts, search_radius) // no districts around the feature if(Count(districts_within_search_radius ) == 0) { return "feature has no school district within search radius" } // this is basically the code from your previous question var min_distance = Infinity var nearest_district = "" for(var district in districts_within_search_radius) { var dist = Distance($feature, district) // dist > 0: exclude the district that contains the feature if(dist > 0 && dist < min_distance) { min_distance = dist nearest_district = district.NAME } } // no districts that don't intersect the feature if(nearest_district == "") { return "there are " + Count(districts_within_search_radius) + " districts within the search radius, but they all intersect the feature" } return nearest_district

Re: The nearest school district calculation

Robswann — Tue, 24 Aug 2021 14:48:31 GMT

Yes you got it right. thanks again!