docs: private static double[] randomLatitudeLongitude(Random r) {
      // Make marginally more realistic looking data by non-uniformly sampling
      // latitude, since Earth is a sphere, and there is not much at the poles
      double lat = Math.pow(1. - r.nextDouble() * 2., 2) / 2. * 180;
      double lng = (.5 - r.nextDouble()) * 360.;
      return new double[] { lat, lng };
    }