As the data of 3D model in large-scale virtual landscape was too huge,the optimization methods of 3D model were researched from three aspects-selection of modeling tools,reduction in redundancy and complexity of model and compression of model file.Then,a framework of large-scale virtual landscape's navigation system was proposed,and the realization process of navigation system was expounded through the data conversion of 3D model,the design of navigation path and the integration of navigation system.At the ...