三维地形信息测量系统的设计

在土地整理工作中,为降低工程土方量估算中三维地形信息测量的成本,同时提高测量精度与效率,设计了一种RTD DGPS与激光测量相结合的三维地形信息测量系统。使用RTD DGPS可以方便快捷地获得米级精度的水平位置数据;而高程的测量则采用激光测量系统完成,在100 m的范围内使用,其测量误差不大于4 cm,弥补了DGPS系统在高程测量中误差较大的不足。为满足野外作业的可靠性与便携性的需要,系统的数据采集部分以ARM7处理器为核心,并将采集的数据存储到U盘中。室外试验结果表明,系统工作稳定,可作为一种工具用于三维地形信息测量。

Design of three-dimensional topographic information measuring system

Land reclamation plays an important role in protecting cultivating field resources, where topographic information is required for project evaluation, optimization and management. The 3D topographic data is important for estimating earthwork. To lower the cost, improve the efficiency and to increase the data accuracy in getting 3D topographic information, a system that combines RTD GPS and laser measurement unit was designed. Using RTD GPS data of longitude and latitude can be obtained easily and rapidly with the error magnitude of meter. The laser measurement unit can measure the altitude with the error less than 4 cm in 100 m range. An ARM7 CPU was integrated into the system to make it reliable and portable. The system also supports USB interface storage equipment. Experiment results indicate that the system can be effectively used in measuring 3D topographic data.