So, instead of'intermediate layer correction', we should adopt freeair gravity anomaly and'topographic trend surface correction', which result in topographic trend surface freeair gravity anomaly.
The altimetry freeair gravity anomaly can describe structure and basin on continental shelves, and its derived submarine topography contains lots of submarine tectonic information.
测高空间重力异常也可刻画陆架构造及盆地分布，由其推算出的海底地形含有大量的海底构造信息。
3
With this system one can compute the values of free-air gravity anomaly, Bouguer gravity anomaly and isostatic gravity anomaly.