Finally, the identification index, three-dimensionalsurvey methods, prevention and controlling measures, and further study trend for seawater intrusion are also put forward.
From the survey data, Berg's team created the first three-dimensional groundwater map, using statistical modelling to show levels that are relatively arsenic-free.
从调查数据中，研究团队制成了第一张三维地下水地图，用统计模拟的方式显示了与不含砷相关的水平。
3
The article expounds the establishment method, establishment process, establishment principles and points for attention of the threedimensional control network in GPS highway engineering survey.