Laser & Optoelectronics Progress, Volume. 59, Issue 16, 1628005(2022)
Construction and Application Analysis of Bidirectional Reflectance Distribution Function Model of Dunhuang Radiation Correction Site
Figures & Tables(12)
Fig. 4. Goodness-of-fit for BRDF model established by multiple sets of data. (a) First set of data on September 22; (b) second set of data on September 22; (c) third set of data on September 22; (d) first set of data on September 23; (e) second set of data on September 23; (f) third set of data on September 23
Fig. 6. Relative deviation between the simulated apparent reflectance of AQUA MODIS and its observations at different VZAs. (a) Band 1 (645 nm); (b) Band 2 (856 nm); (c) Band 3 (466 nm); (d) Band 4 (553 nm); (e) Band 7 (2113 nm); (f) average of all bands
Fig. 7. Relative deviation between simulated apparent reflectance of AQUA MODIS and its observations (before BRDF correction and after BRDF model correction under Six combinations of different kernel functions). (a) Sept. 22 and Sept. 30; (b) Sept. 23 and Oct. 2
Table 1. Geometric and atmospheric parameters during satellite time
View tableTable 1. Geometric and atmospheric parameters during satellite time
Date 09-17 09-22 09-23 9-25 09-26 09-30 10-02 Transit time 14∶45 15∶05 14∶10 13∶55 14∶40 14∶15 14∶05 SZA /（°） 41.36 45.09 41.25 41.580 44.41 44.36 44.58 SAA /（°） -152.45 -146.74 -166.01 -170.49 -155.21 -163.74 -167.97 VZA /（°） 4.36 28.38 53.94 62.32 15.47 48.50 58.34 VAA /（°） 85.46 261.97 73.30 71.06 79.78 74.13 71.50 AOD（550） 0.075 0.716 0.213 0.246 0.388 0.404 0.358 Water vapor /（g·cm2） 0.350 0.684 0.605 0.506 0.656 0.797 0.487
Table 2. Measurement information of UAV measurement system
View tableTable 2. Measurement information of UAV measurement system
Date Time Solar zenith /（°） Solar azimuth /（°） 2020-09-22 13：20 40.275 174.242 14：44 43.135 205.761 16：30 55.551 236.041 2020-09-23 09：35 67.690 110.764 11：10 52.165 131.700 12：00 45.874 146.052
Table 3. BRDF parameters of typical bands
View tableTable 3. BRDF parameters of typical bands
Wavelength /nm BRDF parameter 2020-9-22 2020-9-23 First set of data Second set of data Third set of data First set of data Second set of data Third set of data 645 fiso 0.2872 0.3055 0.2753 0.2785 0.2544 0.2658 fvol 0.1218 0.0052 0.0868 0.1947 0.2294 0.1743 fgeo 0.0166 0.0401 0.0208 0.0188 0.0078 0.0177 856 fiso 0.2896 0.3094 0.2678 0.2631 0.2503 0.2617 fvol 0.1105 -0.0062 0.0882 0.1895 0.2261 0.1627 fgeo 0.0179 0.0413 0.0181 0.0158 0.0066 0.0175 466 fiso 0.2027 0.2143 0.1984 0.2001 0.1801 0.1887 fvol 0.1071 0.0270 0.0717 0.1581 0.1807 0.1455 fgeo 0.0080 0.0245 0.0131 0.0075 0.0009 0.0079 553 fiso 0.2562 0.2717 0.2484 0.2532 0.2284 0.2384 fvol 0.1205 0.0182 0.0827 0.1854 0.2284 0.1681 fgeo 0.0129 0.0337 0.0182 0.0150 0.0053 0.0139 2113 fiso 0.4018 0.4297 0.3583 0.3311 0.3388 0.3650 fvol 0.1103 -0.0369 0.1090 0.2660 0.2711 0.1738 fgeo 0.0224 0.0519 0.0141 0.0035 -0.0003 0.0211
Table 4. Relative deviation between AQUA MODIS simulated apparent reflectance and satellite observations on September 23 (before BRDF correction and after BRDF model correction with six sets of data at different measuring moment)
View tableTable 4. Relative deviation between AQUA MODIS simulated apparent reflectance and satellite observations on September 23 (before BRDF correction and after BRDF model correction with six sets of data at different measuring moment)
Band Before BRDF 2020-9-22 2020-9-23 First set of data Second set of data Third set of data First set of data Second set of data Third set of data Band 1（645 nm） 9.85 7.11 1.99 5.92 6.81 9.19 6.81 Band 2（856 nm） 5.58 2.15 3.63 1.69 2.73 5.29 2.15 Band 3（466 nm） 16.12 15.16 12.08 14.10 15.39 16.67 15.25 Band 4（553 nm） 11.25 9.38 5.09 8.08 9.20 11.16 9.20 Band 7（2113 nm） 10.80 6.73 0.25 8.10 11.31 12.24 6.73 Mean 10.72 8.11 4.61 7.58 9.08 10.91 8.03
Table 5. Relative deviation between AQUA MODIS simulated apparent reflectance and satellite observations on October 2 (before BRDF correction and after BRDF model correction with six sets of data at different measuringmoment)
View tableTable 5. Relative deviation between AQUA MODIS simulated apparent reflectance and satellite observations on October 2 (before BRDF correction and after BRDF model correction with six sets of data at different measuringmoment)
Band Before BRDF 2020-9-22 2020-9-23 First set of data Second set of data Third set of data First set of data Second set of data Third set of data Band 1（645 nm） 21.56 20.62 15.02 19.30 21.32 23.91 21.15 Band 2（856 nm） 13.29 11.79 5.10 11.17 13.68 16.54 12.75 Band 3（466 nm） 33.86 34.07 30.87 32.90 34.73 36.10 34.56 Band 4（553 nm） 25.20 24.95 20.40 23.53 25.50 27.61 25.46 Band 7（2113 nm） 4.62 2.10 6.52 3.55 9.49 10.35 3.24 Mean 19.71 18.70 15.58 18.09 20.94 22.90 19.43
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Xinge Dou, Jun Pan, Hailiang Gao, Kaisi Wang, Han Sun, Peng Jiang. Construction and Application Analysis of Bidirectional Reflectance Distribution Function Model of Dunhuang Radiation Correction Site[J]. Laser & Optoelectronics Progress, 2022, 59(16): 1628005
Paper Information
Category: Remote Sensing and Sensors
Received: Jun. 28, 2021
Accepted: Jul. 13, 2021
Published Online: Jul. 22, 2022
The Author Email: Hailiang Gao (gaohl@radi.ac.cn)
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