turf-tag

turf-tag

tag

Takes a set of points and a set of polygons and performs a spatial join.

Parameters

• points FeatureCollection<Point> input points
• polygons FeatureCollection<Polygon> input polygons
• field string property in polygons to add to joined Point features
• outField string property in points in which to store joined property from `polygons

Examples

var bbox = [0, 0, 10, 10];
// create a triangular grid of polygons
var triangleGrid = turf.triangleGrid(bbox, 50, 'miles');
triangleGrid.features.forEach(function(f) {
  f.properties.fill = '#' +
    (~~(Math.random() * 16)).toString(16) +
    (~~(Math.random() * 16)).toString(16) +
    (~~(Math.random() * 16)).toString(16);
  f.properties.stroke = 0;
  f.properties['fill-opacity'] = 1;
});
var randomPoints = turf.random('point', 30, {
  bbox: bbox
});
var both = turf.featurecollection(
  triangleGrid.features.concat(randomPoints.features));

//=both

var tagged = turf.tag(randomPoints, triangleGrid,
                      'fill', 'marker-color');

//=tagged

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

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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