Due to the inherent complexity of terrain models

the development speed of computer hardware is far from satisfaction for real time rendering of large scale terrain model. To resolve this problem

we enhance the traditional ROAM algorithm and therefore realize view dependent real time rendering of large scale terrain model with GPU programming. Here

the enhanced ROAM (real time optimally adaptive meshes) algorithm is employed to create view dependent continuous LOD models

and the GPU programming is employed to calculate the vertices’ transform

normal vector

texture coordinate

texture sampling and fragment lighting and accomplish the rendering for the terrain in the end. Experimental results show that

GPU programming is an effective way to improve the algorithm performance and to achieve real time roaming on relatively large scale terrain.