zoom - lat -lon to mapzen/tilezen tile

gistfile1.txt

function getTileFromLatLon(zoom, lat, lon) {
  const width = Math.pow(2, zoom);
  const height = Math.pow(2, zoom);
  const latRad = (lat * Math.PI) / 180;
  const x = ~~((width * (lon + 180)) / 360);
  const y = ~~(((1 - Math.asinh(Math.tan(latRad)) / Math.PI) / 2.0) * height);
  return {zoom, x, y};
}