摘要
提出大批量多格式原始多波束数据的 DTM 构建方法，以满足大区域、大比例尺海底地形制图的需要。在多种格式原始多波束数据接口和系统内部标准数据结构的基础上，通过对数据文件、数据种类和数据运算量的有效组织管理，实施边读入、边权重配赋的网格插值，分析了高斯、指数和距离平方反比权重函数的适用性，及最小值、最大值和平均值的实用性。在权重配赋网格插值基础上，提出分形 fBM 和张力样条配合使用的方程式插值方法，保证 DTM 数据的有效外延和地形分辨。整套算法效率高，并能有效保证 DTM 的精度，对存储在外部介质的数据遍历一次即可完成网格插值。
In order to map large area and large-scale submarine topography, a technique of DTM construction for huge volumes and various formats of raw multibeam data is presented in this paper. Based on the interface from various formats of raw multibeam data to standard data structure in the system, data files and elements are effectively rearranged to make sounding data weightedly distributed onto neighbour grid nodes while they are read. Gaussian, exponential and IDW weighted distributional functions are selected to suit different features of raw data, and RMS, minimum, maximum and mean value of grid nodes are helpful for analysing and enhancing DTM quality. Equational interpolation of fractal fBM and tensional spline are combined to apply onto the grid nodes with invalid value. The algorithm has the advantage of higher computational rate, consuming less memory and finishing interpolation almost in the process of data reading.
出处
《海洋通报》
CAS
CSCD
北大核心
2003年第1期30-38,共9页
Marine Science Bulletin
基金
国家 863 计划海洋领域 820-01-01 课题资助
