基于嵌入式GIS的GPS野外数据采集系统关键技术实现

Implementation of Key Technologies in GPS Field Data Collection System Based on Embedded GIS

开发了一套基于嵌入式GIS技术的GPS-PDA野外数据采集系统。采用了多线程操作与事件同步相结合的模式解决GPS接收机与PDA之间的串口通信问题;讨论了WGS84(world geodetic system1984)坐标与GIS所使用坐标之间的转换方法;分析了嵌入式系统特点,设计了2级16格的嵌入式GIS网格数据结构,测试结果表明,该数据结构提高了GIS运行速度,解决了嵌入式系统内存不足的问题。通过实际工程应用验证了以上关键技术在系统中的可行性与可靠性。

A GPS-DA field data collection system based on embedded geographic information system （GIS） is developed. The serial pert communication between GPS receiver and PDA is solved by the means, which combined multithreaded operation and event synchronization. The coordinate transformation between WGS84 （ world geodetic system 1984） and the GIS coordinates is discussed. The characters of embedded system are analyzed. A two-level and sixteen-grid data structure of embedded GIS is designed. Test results show that the GIS runs at higher speed and the problem of memory shortage in embedded system is solved by the data structure. The feasibility and reliability of these key technologies in the system are indicated by practical application.