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When I am adding a point to my web map I want to give it a letter that represents the area where the point is, so I need to know what area the point is in. In OpenLayers 2 I did it like this: areas[i].geometry.containsPoint(point) ---> returns true if it does.

Is there anything like this in OL3?

I searched in the OL3 API but didn't find it.

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  • It would be reasonably straightforward to write, following the example from OL2. Point in polygon calcs are about 10 lines of code.
    – John Powell
    Commented Jan 22, 2015 at 8:41

3 Answers 3

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You can use yourVectorLayer.getSource().getFeaturesAtCoordinate(point). The result is an array, if its length > 0 then the point is inside, otherwise it's not.

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  • Does this really work? Which version of ol3 are you using? I think the getFeaturesCoordinate() method is knackered (ol3.11).
    – Dennis Bauszus
    Commented Jan 7, 2016 at 14:48
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These kind of operations aren't supported out of the box in ol3. (maybe in the future).

But you can use a library like http://turfjs.org , in this case you'll need https://github.com/Turfjs/turf-within or https://github.com/Turfjs/turf-inside

You can use ol.format.GeoJSON to convert from a ol3-geometry and geojson for turf and back.

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  • And, jsts.
    – John Powell
    Commented Jan 22, 2015 at 8:40
  • yes that is an other option, in that case you'll need ol.format.WKT for conversion.
    – warrieka
    Commented Jan 22, 2015 at 8:47
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The latest version as of writing is 3.16.0, has the API: ol.extent.containsXY(extent, x, y)

See more info in the latest API docs

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