识别地图里的医院红十字特殊符号，并把红色十字符号改为黑色方块，便于地图噪声聚类，为地图的后面处理铺平道路-identification maps of the Red Cross Hospital special symbols, and the Red Cross symbol changed to a black box, Clustering facilitate noise map, the map back to pave the way for treatment

实现地图符号的定制与开发 有一定的参考价值-achieve map symbol customization and the development of certain reference value