Acta Optica Sinica, Volume. 39, Issue 10, 1028004(2019)
On-Orbit Radiometric Calibration of High-Resolution Optical Satellite Camera Based on Wide Dynamic Targets
Figures & Tables(8)
Fig. 1. Schematic of radiative transfer for sun, atmospheric and the earth's surfaces
Fig. 3. Field measurement data. (a) Targets' reflectance; (b) atmospheric parameters
Table 1. Results of typical ground object inversion
View tableTable 1. Results of typical ground object inversion
Ground object Parameter FWD NAD BWD B1 B2 B3 B4 Measured 0.2079 0.2069 0.2086 0.1654 0.1735 0.1990 0.2665 Reflectance Retrieved 0.2013 0.1968 0.2002 0.1587 0.1654 0.1922 0.2538 Grass Relative error /% -3.21 -4.87 -4.02 -4.05 -4.67 -3.38 -4.76 Measured 50.2786 50.3231 50.2757 49.1925 50.6237 51.7993 50.1139 Radiance / (W·m-2·sr-1·μm-1) Retrieved 49.5690 48.7778 49.1658 47.2256 48.2832 50.5055 48.1519 Relative error /% -1.41 -3.07 -2.21 -4.00 -4.62 -2.50 -3.92 Measured 0.1792 0.1785 0.1795 0.1428 0.1595 0.1783 0.2037 Reflectance Retrieved 0.1783 0.1739 0.1722 0.1387 0.1506 0.1712 0.1951 Cobbled road Relative error /% -0.53 -2.56 -4.06 -2.84 -5.55 -4.01 -4.22 Measured 43.7215 43.8044 43.6506 42.4645 46.5339 46.6222 38.4315 Radiance / (W·m-2·sr-1·μm-1) Retrieved 43.9039 43.1117 42.2839 41.2803 43.9670 44.9720 37.0112 Relative error /% 0.42 -1.58 -3.13 -2.79 -5.52 -3.54 -3.70
Table 2. Comparison of calibration coefficient
View tableTable 2. Comparison of calibration coefficient
Sensor band FWD NAD BWD B1 B2 B3 B4 Calibration coefficient obtained with our method / (W·m-2·sr-1·μm-1) 4.5961 4.6710 4.8068 4.1284 4.2275 5.2825 5.1020 Calibration coefficient by test site / (W·m-2·sr-1·μm-1) 4.4444 4.4425 4.9456 3.9604 4.4385 5.5835 5.1493 Relative error /% 3.41 5.14 -2.81 4.24 -4.75 -5.39 -0.92
Table 3. Uncertainty analysis
View tableTable 3. Uncertainty analysis
Uncertainty sources Uncertainty contribution /% Solar irradiance 1.0 Reflectance of wide dynamic targets Diffuser panel calibration 2.0 Sky diffuse correction 1.0 Atmospheric Optical depth 1.0 Transmittance 1.0 Diffuse-to-global ratio 2.0 Site measurement error 0.5 Geometrical factor and others 0.5 Total uncertainty 3.6
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Weiwei Xu, Liming Zhang, Xin Li, Baoyun Yang. On-Orbit Radiometric Calibration of High-Resolution Optical Satellite Camera Based on Wide Dynamic Targets[J]. Acta Optica Sinica, 2019, 39(10): 1028004
Paper Information
Category: Remote Sensing and Sensors
Received: Apr. 15, 2019
Accepted: Jun. 27, 2019
Published Online: Oct. 9, 2019
The Author Email: Xu Weiwei (weilxu@aiofm.ac.cn)
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