一种基于小波的三维地形绘制集成技术

本文利用现有地形绘制技术和小波多尺度分析方法，结合大规模地形应用特点，研究了三维地形绘制算法．首先，根据地形高程模型（DEM）的数据结构的特点，阐述了它可以借助于小波方法进行分析处理的可行性：其次，得到了提取多尺度地形数据基本特征的方法：并通过小波系数来表达低频概貌和高频细节，生成多尺度的地形数据方法；提出了”地形网格的小波渐进重构”规则，设计了动态的渐进重构不同细节的地形网格；最后，构造了绘制算法流程图，实现了三维地形绘制集成技术，解决了多块不同分辨率模型的无缝拼接问题，提高了绘制效率，并通过实验验证了该方法的高效性和可行性．

Method of Continuous Multiscale Analysis on DEM Based on Wavelet Analysis

This paper studies terrain rendering algorithm ,which is based on wavelet continuous multiscale analysis, aimed at large-scale application and taken some classic rendering technology into account. First, it according to the characteristics of data structure of terrain DEM（digital elevation model）, the possibility to carry on analytical and processing is elaborated via wavelet method. Second, the method to extract basic features of muhiscale analysis terrain data is obtained： to express Low-frequency profile and HF details by the use of wavelet coefficient, and mak. a kind of muhiscale analysis terrain data; it creates a rules named ＂Terrain Mesh Wavelet Gradual Reconstruction＂, and designs terrain mesh that has different detail which is in dynamic gradual remodeling. At last, it constructs rendering algorithm flowchart, and completes 3D terrain rendering integration ,and the spliced seamless problems with a lot of different resolution models are selved,so it improves algorithm efficiency. As the result demonstrates, continuous multiscale analysis effect can be achieved and the requirement of real-time rendering can be met.