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This demonstrates using Turf to compare Greenspace Hack data against an external dataset.
var turf = require("@turf/turf");
var getJSON = require("async-get-json");
var greenspaces = await getJSON("https://greenspacehack.com/data/sites_grouped.geojson");
var lsoas = await getJSON("https://greenspacehack.com/data/oxfordshire_lsoas.geojson");
// Find the most deprived LSOAs with no greenspace within 1km
var deprived = [];
turf.featureEach(lsoas, function(feature,index) {
if (feature.properties.multiple<20) return;
var nearestGreenspace = turf.nearestPoint(feature, greenspaces);
if (turf.distance(feature,nearestGreenspace)>=1) deprived.push(feature);
});
// Show on a map
deprived;
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