Determine if a point lies inside a polygon

Question

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.

jskinner · Answer

Hi Edward,

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

khutchins · Answer

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

RandyBonds_Jr_ · Answer

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);