用于对空间数据的投影变换。共实现了Albers、Lambert、高斯-克吕格、UTM和Mercator五种投影的正反变换。有需要函数使用说明的可通过EMail向作者索取。-right spatial data for the projection transformation. The total amount of Albers, Lambert, Gaussian - Krger, UTM and five Mercator projection transform the pros. The need to function for use by the author to obtain that extension.