Package Exports

@turf/center

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Readme

@turf/center

center

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

Parameters

layer (Feature | FeatureCollection) input features

Examples

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

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this module individually:

$ npm install @turf/center

Or install the Turf module that includes it as a function:

$ npm install @turf/turf