code: public Coordinate metersToTile(Coordinate coord, int zoomLevel) {
          Coordinate pixels = metersToPixels(coord.x, coord.y, zoomLevel);
          int tx = (int) pixels.x / 256;
          int ty = (int) pixels.y / 256;
          return new Coordinate(tx, ty, zoomLevel);
      }
docs: Returns the tile coordinate of the meters coordinate