( 3 ) what should be the monitoring survey period 3 、监测时期应怎样确定
To capture 3 - d ground data by means of terrestrial remote sensing technique for various engineering survey purposes such as monitoring survey for infrastructures , emergency survey for hazardous site in disaster and topographic survey for road design 以地面遥距感应技术获取立体地面数据作各种工程测量用途,例如基础设施的监察测量、灾难时危险位置的紧急测量以及道路设计的地形测量
To capture 3 - d ground data by means of terrestrial remote sensing technique for various engineering survey purposes such as monitoring survey for infrastructures , emergency survey for hazardous site in disaster and topographic survey for road design 以地面遥距感应技术获取立体地面数据作各种工程测量用途,例如基础设施的监察测量、灾难时危险位置的紧急测量以及道路设计的地形测量