Research on graphic rendering of grid data

This paper both introduces the basic connect of digital elevator modal and analyzes the playground that DEM can play in GIS field. We implement a virtual 3D terrain rendering in a personal computer by using DEM data. When rendering the terrain, a quadtree-based optimization algorithm is used for generating continuous levels of a given terrain in real time. Both rendering quality and rendering speed is guaranteed. Besides, this paper also does some effort on the output quality and some basic function in a GIS system