code: public Coordinate tileTopLeft(int tx, int ty, int zoomLevel) {
          int px = tx * tileSize;
          int py = ty * tileSize;
          Coordinate result = pixelsToMeters(px, py, zoomLevel);
          return result;
      }
docs: Returns the top-left corner of the specific tile coordinate
  
  @param tx        The tile x coordinate
  @param ty        The tile y coordinate
  @param zoomLevel The tile zoom level
  @return The EPSG:3857 coordinate of the top-left corner