嫦娥一号异源数据适应精度加权插值融合生成DEM模型

Generated DEM Model of Adaptive Weighted Interpolation Fusion Based on Chang'e-1 Heterologous Data Accuracy

目的提出适应精度加权插值融合的理论模型,实现嫦娥一号CCD立体相机正视影像图制作的1∶250万全月分幅数字高程模型数据和激光高度计LAM获取的高程数据两种异源数据的融合,生成月球虹湾地带30~40°W、40~50°N区域更精确的DEM模型。方法根据适应精度加权插值融合的理论模型,选取月球虹湾地带30~40°W、40~50°N区域作为研究对象,以异源数据为数据源,根据数据源不同精度分配权重,利用MATLAB编程,实现适应精度加权插值融合的算法,生成了月球虹湾地带30~40°W、40~50°N区域DEM模型。同时,根据克里金插值理论,生成相应区域DEM模型。结果通过改变适应精度加权插值融合的理论模型的权重参数,分别选取3个典型权重参数值,即分别分配激光高度计高程数据参数为0.9、0.5、0.1。结论克里金插值生成的DEM精度对比分析,说明适应精度加权插值融合可以生成更精确的DEM模型,是切实可行、有效的方法。

Objective To propose the theoretical model of adaptive precision-weighted interpolation fusion,to implement heterologous data fusion of 1 ∶ 2500000 digital elevation model data produced by fore-sight images shot by Chang'e-1 CCD stereocamera and elevation data obtained by laser altimeter,and to generate more accurate digital elevation model of Sinus Iridum area at 30-40° W,40°-50° N. Methods With the theoretical model of weighted interpolation fusion,Sinus Iridum area at 30°-40° W,40°-50° N was selected as a research subject,and Heterologous Data as data resources. Weight was distributed weight based on the differerence of data accuracy.The MATLAB programming was used to complete the calculation process and the digital elevation model of Sinus Iridum area was generated at 30°-40°W,40°-50°N. Based on the Kriging interpolation theory meantime,the digital elevation model of related area was produced. Results Via revising the weighting parameter of the theoretical model of weighted interpolation fusion,three typical weighting parameters were selected to distribute the DEM of laser altimeter as 0. 9,0. 5 and 0. 1. Conclusion Compared with the digital elevation model's precision based on Kriging interpolation theory,the method of adaptive precision-weighted interpolation fusion could generate more precise DEM model,which showed that weighted interpolation fusion method was feasible and effective.