说明：  地理信息系统设计ArcView的二次开发.ArcView软件是一套辅助用户组织、维护、显示、分析和传播地图与空间信息的传输工具，它为用户提供了进行空间决策的框架，空间处理能力及建立数学模型
(geographic information system design ArcView the secondary development. ArcView software is a supplement to household organization, and maintenance, display, analysis and dissemination of maps and spatial information transmission tool, It provides users with a space policy framework, the capacity and space mathematical model)