Ray tube trace in typical seabed terrain;

Research of seabed terrain displaying based on Direct3D;

Submarine Terrain Analysis Based on Hypergraph and Characteristic Extraction;

Based on the hypergraph based data structure(HBDS),object-oriented and relational database management system(RDBMS) theories,this paper presents an object-oriented HBDS model for a complicated and gigantic ocean system,and particularly,for submarine terrain.

But submarine topography changed differently in the different area,especially in the kinds of erosion and siltation.

Since the diversion of the Yellow River in 1976,the submarine topography in the Yellow River delta coastal zone Pile 106 to Yellow River Port has suffered intensive erosion,and the shore has constantly retrograded.

Based on the observed data and the numerical computation, a case study on an offshore platform in the Chengdao oil field area was made to analyze the effect of submarine topography variation on dynamic characteristics of offshor.

This paper gives an outline of recent progress in the fields of radial orbit error analysis in space and frequency domain,recovery of gravity anomalies and bathymetry from altimeter data,computation of ultra high degree geopotential model using altimeter-derived gravity anomalies.