基于正交小波及其球形波的三维地形绘制算法

Rendering Algorithm of 3D Terrain Based on Orthogonal Wavelet Transformation and Globular Wave

根据地形高程模型(DEM)的数据结构的特点,阐述基于正交小波方法进行分析处理的可行性,并得到提取多尺度地形数据基本特征.通过小波系数来表达低频概貌和高频细节,生成多尺度地形数据的方法,区别其他阈值选择策略,首次以球形波物理模型得出阈值选择计算公式,设计了渐进重构不同细节的地形网格规则,通过实验验证了该方法解决多块不同分辨率模型的无缝拼接问题的高效性和可行性.

Analyzied the feasibility of processing data by using the orthogonal wavelet transformation, according to the characteristics of the data structure of multidimensional terrain DEM（ digital elevation model） and we get the basic features of multiscale terrain data, then we get the method of extracting and analyzing the multiscale terrain data using the wavelet coefficient to show the LF（low-frequency） profile and HF details. Also, the globular wave model is used to obtain the algorithm of threshold choice for the fist time and this threshold choice strategy is lifferent from other＇s. Here, a kind of gradual remodeling rule is designed for differently-detailed terrain mesh. As the result demonstrated, in solving the spliced seamless problems which are based on a lot different mutiresolusion models, the continuous muhiscale analysis effect has been achieved and the requirement of real-time rendering has been met.