Get coordinates of geogson feature in Mapbox

Question

A GeoJson feature looks like this :

{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Point",
    "coordinates": [
      43.59375,
      59.17592824927136
    ]
  }
}

In Mapbox using Java/JVM we can construct the feature like this :

val testFeature = Feature.fromGeometry(Point.fromLngLat(2.0,3.0))

But I don't seem to find a method to get coordinates/point back from the feature.

There is a Feature#getGeometry() but I can't get the coordinates from that either as that's just a sugar for the GeoJson interface itself.

erluxman · Accepted Answer · 2019-05-13T07:07:12.847

7

I just found that Each Feature expose the method .geometry() which we can cast to any type (Point, Line, polygon, Multipoit.. etc). From there we can get the either Point or List<Point>.

Example :

val position1 = feature1.geometry() as Point
val longitude = position1.longitude()

val area1 = feature2.geometry() as MultiPoint
val firstPointLatitude = area1.coordinates()!![0].latitude()

edited May 13 '19 at 07:07

answered Jan 30 '19 at 02:38

erluxman

18,155
20
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Looks like this throws an error – alfietap Apr 19 '22 at 15:22

score 1 · Answer 2 · answered Jan 29 '19 at 22:28

1

Each feature has a .coordinates() method that returns a List<Point> or List<List<Point> object (unless you're calling it on a Point feature, in which case it will return a List<Double>.

[source: core API's geojson documentation]

answered Jan 29 '19 at 22:28

riastrad

1,624
10
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[Feature.class](https://docs.mapbox.com/archive/android/java/api/libjava-geojson/4.3.0/com/mapbox/geojson/Feature.html) doesn't have a `.coordinates()` method though — you'd have to call `feature.geometry()` and then cast to a specific feature type first – anotherdave Feb 26 '21 at 10:03

Get coordinates of geogson feature in Mapbox

2 Answers2