关键词: ROAM 层次细节 地形可视化

Abstract:

3D terrain visualization is one of the key techniques in GIS,computer simulation and virtual reality.The ROAM algorithm is based on multiple levels of detail.Its simplicity and expansibility make it a common terrain visualization method.This paper presents the theory and characteristics of the ROAM al   gorithm.Then the authors give an improved algorithm and its implementation based on ROAM according to practical applications.The experimental results sh ow that the ROAM algorithm can authentically realize terrain visualization,and the improved algorithm can avoid the sensitivity of ROAM on viewpoint dis   tances.Thus the computing speed is increased and the application demands are satisfied.

Key words: （ROAM,level of detail,terrain visualization）