对TM／ETM＋的大气校正产品质量进行评价是改进影像质量的必要手段。提出采用已有高质量TM／ETM4-表面反射率产品作为参考影像评价TM／ETM＋的大气校正产品质量的方法。该方法设计了面向产品质量评价的影像光谱采样方案和多时相遥感影像PIFs（pseudo invariant features，PIFs）样本自动识别方法，能对多时相／季相TM／ETM＋大气校正产品质量进行评价。试验表明该方法能准确识别PIFs地物，评价结果真实反映了遥感影像大气校正结果准确度。方法具有快速和低成本等特点，能开展规模化应用。%Assessing the quality of atmospheric correction products retrieved from TM/ETM--imagery is a necessary means to improve the product＇s quality, and it is also important to the scientists who use the imagery. At the basis of the summarization of the present methods, a new approach using the available global land survey surface reflectance product as reference imagery for validating the accuracy of atmospheric correction products retrieved from TM/ETM＋is proposed. The steps are as follow.. Firstly, the spectrum sampling strategy is designed to get spectrum samples from the product imagery and the reference imagery, then using the coefficient of variation to determine homogeneous samples. After obtaining the homogeneous samples from the imagery, the PIFs （pseudo invariant features, PIFs） samples are identified by using the spectrum correlation coefficient R and the normalized difference vegetation index（NDVI） differential between the product imagery and the reference imagery. Finally, the quality consistencies between the multi-temporal imagery are evaluated based on the PIFssamples. Experimental results have shown that the new approach can accurately identify the PIFs and obtain the quality information rapidly, and it is very suitable for large-scale applications and can provide the global/region change researchers with some essential quality information on base imagery.
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