turf-tag
tag
Takes a set of points and a set of polygons and performs a spatial join.
Parameters
points
FeatureCollection<Point> input pointspolygons
FeatureCollection<Polygon> input polygonsfield
string property in polygons
to add to joined Point featuresoutField
string property in points
in which to store joined property from `polygons
Examples
var bbox = [0, 0, 10, 10];
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));
var tagged = turf.tag(randomPoints, triangleGrid,
'fill', 'marker-color');
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