中文摘要：

目的针对GIS系统中海量数据处理和高精度的要求,构造数字地图绘制过程中的运算速度快、计算数据精度高、便于计算机编程和实用性强的算法。方法基于WGS-84坐标系下,通过构建Albers投影公式体系,推导出数字地图的投影算法,并对该算法进行改进。结果该改进算法具有原理新颖、计算速度快、计算精度高的特点。结论该改进算法在多个GIS系统成功应用,所完成的工作可以明显提高基于WGS-84坐标系下GIS系统的运行速度和精度。

英文摘要：

Aira The purpose is to introduce a digital map＇s projecting algorithm to solve the problems of greater capacity of data processing and higher precision in GIS. Methods Based on WGS-84, the Albers projecture formulas is given, and then the digital map＇s projecting algorithm is introduced and improved. Results The algorithm is proposed with new principle, shorter processing time and higher computing precision. Conclusion The algorithm is applied in several GIS successfully and the processing speed and the computing precision are improved evidently.