基于曲面内插技术的数字地形生成原理及应用

Theory and application of digital topography generation based on curved surface interpolation

本文以黄河下游实测大断面数据为基础数据,结合卫星图像、遥感图像数据判断河道主流线、滩槽分界线、水边线及控导工程,在此基础上完成断面曲面内插。利用河道实测大断面高程及下游关键控制点的水位流量关系数据推求内插断面的高程数据,快速生成整个下游河道的数字地形不规则三角网。以黄河下游花园口至利津河段为例详述了黄河下游河道数字地形生成的原理及实现。生成的地形数据与实测数据相比较,在河槽高程、河槽形态及河槽面积上均吻合较好,能满足生产中对地形数据精度的需要。

Based on the data of topographic mapping the satellite images and remote sensing images are utilized to judge the line of main flow, boundary between polder and main flow channel and water controlling projects for implementing the curved surface interpolation of river sections and generating the triangular discharge irregular network of the topography with reference to the recorded cross section data and stage-relationships. This method is applied to generate the digital topography of river reach from Huayuankou to Lijin in the Lower Yellow River. The comparison between the generated topographic data with the survey data shows that the proposed method is feasible and practical with enough accuracy.