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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (1) : 81-89     DOI: 10.6046/gtzyyg.2020.01.12
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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
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Abstract  

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.
Keywords atmospheric correction      SPOT6 image      6S model      FLAASH model      Huangshui River basin     
:  TP79  
Corresponding Authors: Xiaohong GAO     E-mail: xiaohonggao226@163.com
Issue Date: 14 March 2020
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Zhenyu SHEN
Xiaohong GAO
Min TANG
Cite this article:   
Zhenyu SHEN,Xiaohong GAO,Min TANG. Comparison and accuracy verification for atmospheric correction of SPOT6 image in high altitude complex terrain area[J]. Remote Sensing for Land & Resources, 2020, 32(1): 81-89.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.12     OR     https://www.gtzyyg.com/EN/Y2020/V32/I1/81
Fig.1  Overview of study area
参数 AVG6S模式 GRD6S模式
获取时间 2016年8月8日
太阳天顶角/(°) 29.4
太阳方位角/(°) 126.1
卫星天顶角/(°) 17.4
卫星方位角/(°) 201.6
大气模式 中纬度夏天
气溶胶模式 大陆模式
550 nm AOD 0.3 0.001,0.15,0.3,0.45,0.6
目标海拔高度/km 2.840 1.5,2.0,2.5,3.0,3.5,4.0,4.5
传感器高度/km 695
Tab.1  Two kinds of 6S model input parameters
Fig.2  Flow chart of 6S model processing
Fig.3  Comparison of correction results in urban areas
Fig.4  Comparison of correction results in rural areas
Fig.5  Scatter plot of surface reflectace from SPOT6 and Landsat8 SR
范围 波段 TOA GRD6S模式 AVG6S模式 FLAASH模式 Landsat8 SR
Std RE/% Std RE/% Std RE/% Std RE/% Std
整景 蓝 0.022 7 113.60 0.028 8 14.36 0.030 9 2.79 0.028 1 33.04 0.020 4
绿 0.026 0 30.60 0.032 2 11.29 0.033 4 7.97 0.031 4 10.56 0.026 0
红 0.039 3 20.70 0.047 0 0.92 0.047 4 1.62 0.044 8 12.29 0.038 9
近红外 0.057 8 6.24 0.066 6 3.01 0.066 0 1.91 0.064 3 1.15 0.068 5
高山区 蓝 0.012 8 145.36 0.016 5 27.59 0.017 7 37.38 0.016 5 23.93 0.015 5
绿 0.016 0 38.14 0.019 7 14.04 0.020 8 18.84 0.019 8 8.66 0.020 1
红 0.023 0 35.85 0.027 0 1.25 0.028 0 5.20 0.026 8 8.06 0.025 0
近红外 0.060 3 7.00 0.068 1 0.73 0.068 8 1.42 0.067 2 2.65 0.084 8
农村地区 蓝 0.013 4 134.11 0.018 7 28.69 0.018 5 6.68 0.017 6 38.24 0.015 0
绿 0.017 0 32.80 0.022 0 14.76 0.021 9 8.41 0.021 2 11.54 0.017 9
红 0.027 5 26.31 0.033 9 3.70 0.033 3 0.07 0.032 3 14.69 0.028 0
近红外 0.056 9 8.28 0.066 6 2.32 0.064 5 0.46 0.064 0 2.97 0.054 1
城区 蓝 0.023 5 74.09 0.035 8 4.15 0.031 8 14.94 0.030 5 23.93 0.027 5
绿 0.029 4 19.26 0.040 9 7.24 0.037 5 0.37 0.036 5 8.66 0.034 7
红 0.044 1 9.43 0.056 6 3.19 0.052 8 5.03 0.051 2 17.23 0.048 3
近红外 0.045 0 7.43 0.055 2 3.40 0.051 7 0.00 0.050 5 1.79 0.049 4
Tab.2  Surface reflectance results of whole scenes and zones before and after atmospheric correction
Fig.6  Comparison of spectral curves of vegetation
Fig.7  Comparison of spectral curves of soil
Fig.8  Comparison of spectral curves for different water quality
Fig.9  Comparison of spectral curves of city building and road
范围 TOA GRD6S模式 AVG6S模式 FLAASH模型 Landsat8 SR
Std RE/% Std RE/% Std RE/% Std RE/% Std
整景 0.173 16.86 0.254 2.24 0.210 1.19 0.233 7.76 0.179
高山区 0.128 15.17 0.406 0.23 0.146 2.81 0.142 6.46 0.131
农村地区 0.128 14.97 0.147 2.39 0.145 0.11 0.143 7.54 0.123
城区 0.133 24.35 0.173 1.49 0.159 6.22 0.156 14.36 0.148
Tab.3  NDVI results of whole scenes and zones before and after atmospheric correction
Fig.10  Comparison among NDVIs before and after atmospheric correction
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