topic Re: Determine if a point lies inside a polygon in ArcGIS JavaScript Maps SDK Questions

Determine if a point lies inside a polygon

EdwardSohn2 — Wed, 04 Feb 2015 17:06:34 GMT

Is there an API available for determining if a point lies inside a polygon geometry determined by a ring?

To do so for a rectangle is simple, but for a ring of points which determines a polygon, what is the best way?

Thanks.

Re: Determine if a point lies inside a polygon

RandyBonds_Jr_ — Wed, 04 Feb 2015 17:37:54 GMT

I use this to see in my app if a point is in City Limits (a polygon)

yakimaCL = new esri.layers.FeatureLayer("http://gis.yakimawa.gov/arcgis101/rest/services/General/YakimaLayers/MapServer/9", {
          mode: esri.layers.FeatureLayer.MODE_SNAPSHOT,
          outFields: ["*"],
   opacity: .4
        });
//the point
var pt = esri.geometry.geographicToWebMercator(new esri.geometry.Point(candidate.location.x.toFixed(6),candidate.location.y.toFixed(6)));
// Check to see if the point is in the City Limits
var isYakima = yakimaCL.graphics[0].geometry.contains(pt);

Re: Determine if a point lies inside a polygon

KellyHutchins — Wed, 04 Feb 2015 17:41:02 GMT

Randy's approach of using geometry.contains is a great one. Here's another option that uses the Geometry Service.

Point in polygon search | ArcGIS API for JavaScript

Re: Determine if a point lies inside a polygon

JakeSkinner — Wed, 04 Feb 2015 17:43:17 GMT

Hi Edward,

You could create a Polygon from the points XY coordinates, and then use the Polygon to determine if it contains the point.