The gravimetric observation curves at Chengdu Standard Station showed significantly annual variation period, with air pressure and ground water being main interference factors.
成都基准台的重力观测曲线具明显年变周期，其干扰因素主要为气压和地下水。
2
First of all, You have to design the gravimetric network and a base stATion. Gravimeter observATion are usually made AT the corner of the square grid.
首先必须设计和布置测网，选择一个测量基点，而这些测网交点便是重力测量的观察点。
3
Gravimetric method ever used by environment detection station could not analyze the oil contents completely because of limited methods.