Applied research of Topographic Correction based on the Improved Minnaert Model
基于改进型Minnaert地形校正模型的应用研究

In complicated topographic mountain area,solar radiation on the surface is always changed for the topographic relief effect.Because the extraction accuracy of RS thematic information was interfered,topographic correction has become one of the indispensable key technologies in improving the precision of quantitative sensing data process.In the existing contemporary terrain correction models,the Minnaert model's basic data is easier to obtain.Besides,the Minnaert model has been improved by Dr.Lu Deng sheng for solving the problem of low calibration precision caused by single Minnaert coefficient k,which makes it become an effective method in mountain remote sensing processing of topographic orthorectificafion.In this paper,the topography is efficiently corrected by Cosine model,Minnaert model and the improved Minnaert model,based on ETM images and the corresponding DEM data of Qingtian county of Zhejiang province.The results showed that the improved Minnaert model can eliminate the effect of topography,and the textural and spectral character of the surface can be also kept.Based on image statistical analysis,the improved Minnaert model effect is much more obvious than Cosine model and Minnaert model.