基于MODIS数据的Landsat-7 SLC-off影像修复方法研究

Research on Landsat-7 SLC-off Image Restoration Method Based on MODIS09 Data

研究如何修复由于扫描行校正器SLC故障而造成的数据坏行,成为国际遥感研究的热点。文章在总结现有的修复方法基础上提出用相同时相的MODIS09数据修复SLC-off数据的方法。该方法采用时空自适应反射率融合模型(STARFM)算法实现MODIS09数据和TM/ETM+数据的融合,获得与SLC-off数据相同时相和空间分辨率的融合数据,然后采用局部线性直方图匹配完成对SLC-off数据填充。实验证明该方法修复效果明显好于传统方法,解决了传统修复方法中存在的一些问题,一定程度上提高了ETM+SLC-off数据的利用率。

Study on how to restore SLC-off data has became a hot topic in the international remote sensing domain.At the basis of summarization of present restoration methods,a new method to restore the SLC-off data using the same time MODIS09 data is proposed.The steps are as follow：Firstly,using the algorithm of a spatial and temporal adaptive reflectance fusion model（STARFM）to fuse the MODIS09 and TM/ETM data.After data fusion,we can obtain the fusion data with the same spatial and temporal resolution of SLC-off data.And then,to fill the SLC-off gap data with the MODIS and ETM fusion data using local linear histogram match.Experiment indicates that the method is superior to traditional methods and overcomes some defects in traditional repair methods,which can improve the utilization ratio of ETM＋ SLC-off data to some extent.