README
turf-count
turf count module
turf.count(polygons, points, countField)
Takes a FeatureCollection of Point features and a FeatureCollection of Polygon features and calculates the number of points that fall within the set of polygons.
Parameters
parameter | type | description |
---|---|---|
polygons |
FeatureCollection | a FeatureCollection of Polygon features |
points |
FeatureCollection | a FeatureCollection of Point features |
countField |
String | a field to append to the attributes of the Polygon features representing Point counts |
Example
var polygons = turf.featurecollection([
turf.polygon([[
[-112.072391,46.586591],
[-112.072391,46.61761],
[-112.028102,46.61761],
[-112.028102,46.586591],
[-112.072391,46.586591]
]]),
turf.polygon([[
[-112.023983,46.570426],
[-112.023983,46.615016],
[-111.966133,46.615016],
[-111.966133,46.570426],
[-112.023983,46.570426]
]])
]);
var points = turf.featurecollection([
turf.point([-112.0372, 46.608058], {population: 200}),
turf.point([-112.045955, 46.596264],
{population: 600})
]);
var counted = turf.count(polygons, points, 'pt_count');
var result = turf.featurecollection(
points.features.concat(counted.features));
//=result
Installation
Requires nodejs.
$ npm install turf-count
Tests
$ npm test