turf-min

turf min module

turf.min(polygons, points, inField, outField)

Calculates the minimum value of a field for Point features within a set of Polygon features.

Parameters

parameter	type	description
polygons	FeatureCollection	a FeatureCollection of Polygon features
points	FeatureCollection	a FeatureCollection of Point features
inField	string	the field in input data to analyze
outField	string	the field in which to store results

Example

var polygons = turf.featurecollection([
  turf.polygon([[
    [72.809658, 18.961818],
    [72.809658, 18.974805],
    [72.827167, 18.974805],
    [72.827167, 18.961818],
    [72.809658, 18.961818]
  ]]),
  turf.polygon([[
    [72.820987, 18.947043],
    [72.820987, 18.95922],
    [72.841243, 18.95922],
    [72.841243, 18.947043],
    [72.820987, 18.947043]
  ]])
]);
var points = turf.featurecollection([
  turf.point([72.814464, 18.971396], {population: 200}),
  turf.point([72.820043, 18.969772], {population: 600}),
  turf.point([72.817296, 18.964253], {population: 100}),
  turf.point([72.83575, 18.954837], {population: 200}),
  turf.point([72.828197, 18.95094], {population: 300})]);

var minimums = turf.min(
  polygons, points, 'population', 'min');

var result = turf.featurecollection(
  points.features.concat(minimums.features));

//=result

Installation

Requires nodejs.

$ npm install turf-min

Tests

$ npm test