摘要
Abstract
Interpolation method is one of the most important factors which influence on the accuracy of DEM. However, there are few researches on how interpolation parameters influence interpolation method as well as the interpolation accuracy at last. The interpolation parameters of distance weighted interpolation method was considered as the research object, and respectively selected 6 kinds discrete data as the original data. Then metrics of RMSE was used to measure RMSE of the generated DEM in order to study that how interpolation parameters, including weighted index, search points, search directions, search radius in distance weighted interpolation method affected the accuracy of DEM interpolation. It was drawn: firstly, in the aspect of search directions, it was not obvious to use the four-direction and eight-direction to improve the accuracy of DEM interpolation; secondly, the best search points were 8~12 points; thirdly, when the weighted index was higher than 3, the impact of the change in weighted index on DEM accuracy tended to be not obvious, the best weighted index should be 2 or 3; finally, the degree of influence on the accuracy of DEM interpolation was "the power index>the search points>the search direction".关键词
数字高程模型/插值参数/权指数/搜索点数/搜索方向/方差分析Key words
digital elevation model/interpolation parameter/weighted index/search points/search directions/analysis of variance分类
天文与地球科学
