Abstract
Level of Detail(LOD)is utilized to simplify the model as well as to improve the efficiency in 3D visualization of terrain with large data.The quad-tree is a kind of data structure that is able to optimize complicated data.First,the authors discussed the general method of LOD based on adaptive quad-tree and described the triangle-fan method for model drawing;second,according to the features of multi-resolution of the quad-tree,a method for seamless model drawing,based on the attribute revision of the node in the quad-tree,was proposed;finally,the 3D visualization of a 1∶50 000 map was achieved by this method and the dynamic display was improved.
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