(() => {
  const lo = -2400, hi = 2400, step = 80;
  const n = Math.round((hi - lo) / step) + 1;
  const rows = [];
  for (let j = 0; j < n; j++) {
    const r = [];
    for (let i = 0; i < n; i++) r.push(Math.round(AW.terrain.depth(lo + i * step, lo + j * step)));
    rows.push(r.join(','));
  }
  return lo + '|' + step + '|' + n + '|' + rows.join(';');
})()