turf-center

turf center module

turf.center(features)

Takes a FeatureCollection and returns the absolute center point of all features.

Parameters

Example

var features = {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.522259, 35.4691]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.502754, 35.463455]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.508269, 35.463245]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.516809, 35.465779]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.515372, 35.467072]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.509363, 35.463053]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.511123, 35.466601]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.518547, 35.469327]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.519706, 35.469659]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.517839, 35.466998]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.508678, 35.464942]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-97.514914, 35.463453]
      }
    }
  ]
};

var centerPt = turf.center(features);
centerPt.properties['marker-size'] = 'large';
centerPt.properties['marker-color'] = '#000';

var resultFeatures = features.features.concat(centerPt);
var result = {
  "type": "FeatureCollection",
  "features": resultFeatures
};

//=result

Returns Feature.<Point>, a Point feature at the absolute center point of all input features

Installation

Requires nodejs.

$ npm install turf-center

Tests

$ npm test