IDL中实现对影像的不规则批量裁剪（根据矢量线文件）-subset image via shpfile

中国地图的shpfile文件，来源于国家基础地理信息中心，可通过matlab、global mapper或者其他软件转为GMT识别的数据格式。(The shpfile file of China map comes from the national basic geographic information center. It can be converted to the data format recognized by GMT through MATLAB, global mapper