code: public static OSMTileInfo getMapTileFromCoordinates(final double aLat, final double aLon, final int zoom) {
  		final int y = (int) Math.floor((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI) / 2 * (1 << zoom));
  		final int x = (int) Math.floor((aLon + 180) / 360 * (1 << zoom));
  
  		return new OSMTileInfo(x, y, zoom);
  	}
docs: For a description see:
  see <a href="http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames">http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames</a>
  For a code-description see:
  see <a href="http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames#compute_bounding_box_for_tile_number">http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames#compute_bounding_box_for_tile_number</a>
  @param aLat latitude to get the {@link OSMTileInfo} for.
  @param aLon longitude to get the {@link OSMTileInfo} for.
  @return The {@link OSMTileInfo} providing 'x' 'y' and 'z'(oom) for the coordinates passed.