@turf/tag

@turf/tag

tag

Takes a set of points and a set of polygons and/or multipolygons and performs a spatial join.

Parameters

• points FeatureCollection<Point> input points
• polygons FeatureCollection<(Polygon | MultiPolygon)> input (multi)polygons
• field string property in polygons to add to joined {} features
• outField string property in points in which to store joined property from polygons

Examples

var pt1 = turf.point([-77, 44]);
var pt2 = turf.point([-77, 38]);
var poly1 = turf.polygon([[
  [-81, 41],
  [-81, 47],
  [-72, 47],
  [-72, 41],
  [-81, 41]
]], {pop: 3000});
var poly2 = turf.polygon([[
  [-81, 35],
  [-81, 41],
  [-72, 41],
  [-72, 35],
  [-81, 35]
]], {pop: 1000});

var points = turf.featureCollection([pt1, pt2]);
var polygons = turf.featureCollection([poly1, poly2]);

var tagged = turf.tag(points, polygons, 'pop', 'population');

//addToMap
var addToMap = [tagged, polygons]

Returns FeatureCollection<Point> points with containingPolyId property containing values from polyId

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/tag

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

$ npm install @turf/turf