SOM投影转换为经纬度坐标的C语言代码，非常有用在处理SOM投影数据时-The SOM projection into latitude and longitude coordinates of the C language code, very useful in processing SOM projection data

ALBERS投影正反转换程序，已经编译好了的，可以直接使用-ALBERS projection reversal process, has been compiled, and can be used directly

Principal component analysis of multivariate data analysis projection, Ensure accurate communication is learning a good helper, For beginners with a reference value.