lookup.js

var assert = require('assert');
var fs = require('fs');
var util = require('util');
var path = require('path');
var sprintf = require('sprintf-js').sprintf;
var jsonfile = require('jsonfile');
var Terraformer = require('terraformer');
var GeoStore = require('terraformer-geostore').GeoStore;
var RTree = require('terraformer-rtree').RTree;
var Memory = require('terraformer-geostore-memory').Memory;

var dirname = './geojson-2';
var files = fs.readdirSync(dirname);
var store = new GeoStore({
      store: new Memory(),
      index: new RTree()
});
var start;

start = Date.now();
files.forEach(function(filename) {
    var geojson;
    if (path.extname(filename) === '.json') {
        geojson = jsonfile.readFileSync(dirname + '/' + filename);
        appendId(geojson);
        store.add(geojson, function (err, res) {
            if (err) {
                console.error(err);
            }
        });
    }
});
console.log(Date.now() - start);

start = Date.now();
lookupTest();
console.log(Date.now() - start);

function appendId(geojson) {
    if (geojson.type === 'FeatureCollection') {
        geojson.features.forEach(function(feature) {
            feature.id = feature.properties.iso_3166_2;
        });
    } else if (geojson.type === 'Feature') {
        geojson.id = feature.properties.iso_3166_2;
    }
}

function lookupTest() {
    var lat, long;

    for (lat = -180; lat < 180; lat++) {
        for (long = -90; long < 90; long++) {
            store.contains({
                type : 'Point',
                coordinates : [lat, long]
            }, function(err, res) {
                if (err) {
                    console.log(err);
                } else {
//                    if (0 < res.length) {
//                        console.log(res[0].id, res[0].properties.gns_name, ' lat=' + lat + ' long=' + long);
//                    } else {
//                        console.log('Not found', ' lat=' + lat + ' long=' + long);
//                    }
                }
            });
        }
    }
}