以中国地图数据经兰勃托投影后的数据为基础数据，是用道格拉斯-普克法压缩数据，将数据压缩为50 左右。-In China, the map data by Lambert projection of the supporting data as basic data, data is compressed using Douglas Peucker compressing data is about 50 .

1、根据道格拉斯一普克法，编写程序对经过兰勃特投影的中国版图数据进行压缩和过滤 2、屏幕绘图显示压缩前后的地图数据 3、数据压缩率为50 -1, according to a Douglas Puck law, programming for the Chinese territory after Lambert projection data compression and filtering 2, the screen graphics display map data bef