Comparison and accuracy verification for atmospheric correction of SPOT6 image in high altitude complex terrain area
Zhenyu SHEN,Xiaohong GAO(),Min TANG
College of Geographical Sciences & Physical Geography and Environmental Process Key Laboratory of Qinghai Province & MOE Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation, Qinghai Normal University, Xining 810008, China
In order to obtain the best atmospheric correction method for real surface reflectance of SPOT6 images in high-altitude complex terrain areas with less research, the authors used the 6S model and FLAASH model to perform atmospheric correction for the SPOT6 image covering Huangshui River basin in eastern Tibet Plateau. For the 6S model, the images were processed by AVG6S and GRD6S according to the average aerosol optical depth (AOD), altitude parameters and gradient AOD as well as altitude parameters. The calibration results were verified with the Landsat8 SR surface reflectance product. The results show that the image quality is significantly improved after atmospheric correction, and the reflection characteristics of various ground objects are more realistically reflected. Correlation analysis and a comparison with typical ground reflection spectrum curve and normalized difference vegetation index (NDVI) show that the overall performance of AVG6S is the best, whereas GRD6S performance is more prominent in urban and high mountain areas. The calibration result of the 6S model is better than that of the FLAASH model and hence the 6S model is an atmospheric correction method more suitable for high altitude region.
申振宇,高小红,汤敏. 高海拔复杂地形区SPOT6图像大气校正方法对比及精度验证[J]. 国土资源遥感, 2020, 32(1): 81-89.
Zhenyu SHEN,Xiaohong GAO,Min TANG. Comparison and accuracy verification for atmospheric correction of SPOT6 image in high altitude complex terrain area. Remote Sensing for Land & Resources, 2020, 32(1): 81-89.
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