code: public static double getPixelYSize(BoundingBox webMercatorBoundingBox,
  			long matrixHeight, int tileHeight) {
  		double pixelYSize = (webMercatorBoundingBox.getMaxLatitude() - webMercatorBoundingBox
  				.getMinLatitude()) / matrixHeight / tileHeight;
  		return pixelYSize;
  	}
docs: Get the pixel y size for the bounding box with matrix height and tile
  height
  
  @param webMercatorBoundingBox
  web mercator bounding box
  @param matrixHeight
  matrix height
  @param tileHeight
  tile height
  @return pixel y size