Get trees from OSM using node-osmium

get-trees.js

'use strict';

var osmium = require('osmium');

var file = new osmium.File("../mbtiles/us-west-latest.osm.pbf");
var reader = new osmium.Reader(file, {node: true});

var trees = 0;

process.stdout.write('[');

var first = true;

var handler = new osmium.Handler();
handler.on('node', function (node) {
	if (node.tags("natural") === "tree") {
		if (!first) process.stdout.write(',');
		process.stdout.write('[' + node.lon + ',' + node.lat + ']');
		first = false;

		process.stderr.cursorTo(0);
		process.stderr.write(String(++trees));
	}
});
handler.on('after_nodes', function () {
	process.stdout.write(']');
	process.stderr.write('\n');
});
osmium.apply(reader, handler);