Abstract: The mainstream 3D digital earth platforms nowdays have compatibility problems in both data support and data management.To meet the requirements of 3D platform for digital earth,the paper makes an in-depth study of the real time terrain rendering mechanism of osgEarth and lucubrates the technical difficulties of data loading and wave simulation in the decelopment process of the platform.For the,the LOD four binomial tree model is put forward for real-time dataload and an improved Higgins algorithm is proposed for more realistic ocean wave simulation.A 3D digital earth platform for practical engineering application is developed using software component engineering.

Key words: digital earth;software component;improved Higgins algorithm;osgEarth