基于改进型Minnaert地形校正模型的应用研究

在复杂的山区,地表接受的太阳辐射受到地形起伏的影响严重,干扰提取遥感专题信息精度,地形校正成为提高定量化遥感数据处理精度的关键技术之一。在目前已有的多种地形校正模型中,陆灯盛改进型Minnaert模型不仅所需基础数据获取容易,并且解决了仅依靠单一的Minnaert系数k造成的校正精度不高的难题,是山区遥感信息处理过程中地形校正的有效方法之一。选取浙江省青田县的ETM影像和对应的DEM数据,分别利用余弦模型、原始的Minnaert模型和改进型Minnaert模型对遥感影像进行地形校正。研究结果表明改进型Minnaert模型能有效地去除地形的影响,同时又能保持地物原有的纹理特征和光谱特性,具有较强的实用性。基于图像统计分析,与余弦模型及原始的Minnaert模型校正结果相比,改进型Minnaert模型地形校正效果明显增强。

Applied research of Topographic Correction based on the Improved Minnaert Model

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.