ground photogrammetric survey

例句：

1. 1.The ground is soft and moist under the tree.
   树下的土地是软的且湿润的。
2. 2. The groundwater has a high salinity level.
   地下水含盐量很高。
3. 3.The foundation of the building is strong.
   这栋建筑的基础很牢固。