Journal of Atmospheric and Environmental Optics, Volume. 19, Issue 5, 599(2024)
In-orbit calibration application and verification of Gaofen-2 satellite based on hyperspectral automatic observation equipment
Figures & Tables(18)
Fig. 1. Flow chart of the reflectance-based radiometric calibration approach
Fig. 7. Observation image of Baotou field of GF-2 of October 24, 2021
Fig. 8. Observation data of automatic equipment. (a) Hyperspectral radiometer; (b) irradiance-meter;(c) channel radiometer of sand field
Fig. 10. Hyperspectral reflectance based on channel and reference reflectance of October 19 (a) and 24 (b), 2021
Fig. 11. Radiance of GF-2 PMS corresponding to the digital number value
Table 1. Main parameters of the filed reflectance monitoring radiometer
View tableView in ArticleTable 1. Main parameters of the filed reflectance monitoring radiometer
Index Parameter Spectral range/nm 380-2450 FWHM/nm ≤ 4 (@350-950 nm)
≤ 15 (@950-1650 nm)
≤ 20 (@1650-2450 nm)
Calibration uncertainty/% 2.46 (k = 2) Footprint diameter/cm 35 Operating temperature/℃ -30-60
Table 2. Main parameters of the sky ratio observation irradiance meter
View tableView in ArticleTable 2. Main parameters of the sky ratio observation irradiance meter
Index Parameter Spectral range/nm 380-2450 nm FWHM/nm ≤ 4 (@400-950 nm)
≤ 15 (@950-1650 nm)
≤ 20 (@1650-2450 nm)
Calibration uncertainty/% 2.52 (k = 2) Operating temperature/℃ -30-60
Table 3. Main parameters of the surface truth observation radiometer
View tableView in ArticleTable 3. Main parameters of the surface truth observation radiometer
Index Parameter Band/nm 440, 480, 560, 590, 650, 860, 1610, 2200 Bandwidth/nm 20 ± 1 Calibration uncertainty/% 2.1 (k = 2) Footprint diameter/cm 31.5 Operating temperature/℃ -30-60
Table 4. GF-2 satellite payload technical specifications
View tableView in ArticleTable 4. GF-2 satellite payload technical specifications
Index Parameter Payload Panchromatic multispectral camera Spectral range/nm 450-900 (PAN), 450-520 (band 1), 520-590 (band 2), 630-690 (band 3), 770-890 (band 4) Spatial resolution/m 1, 4, 4, 4, 4 Width/km 45 (2 camera combination) Side swing ability/(°) ±35 Revisit time/d 5
Table 5. Atmospheric parameters on satellites overpass
View tableView in ArticleTable 5. Atmospheric parameters on satellites overpass
Satellite Overpass time Water vapor/(g·cm-2) Aerosol optical depth (550 nm) O3 concentration/DU GF-2 2021-10-19 11:28:30 0.499 0.068 296.2 2021-10-24 11:29:41 0.675 0.168 330.0
Table 6. Calibration parameters of multi-channel of GF-2 PMS sensor
View tableView in ArticleTable 6. Calibration parameters of multi-channel of GF-2 PMS sensor
Satellite channel PAN Band 1 Band 2 Band 3 Band 4 Slope 0.2616 0.31159 0.27253 0.24244 0.25673 Intercept -12.96 -50.48 -26.97 -18.24 -8.53
Table 7. Verified results of satellite image by different surfaces
View tableView in ArticleTable 7. Verified results of satellite image by different surfaces
Surface type Satellite channel Radiance/(μW·cm-2·nm-1·sr-1) Deviation/% Satellite 6S Sand field PAN 71.69 71.63 0.08 Band 1 61.37 62.35 -1.57 Band 2 72.89 73.85 -1.3 Band 3 80.37 79.95 0.52 Band 4 66.98 66.63 0.52 Tarps field PAN 44.36 43.6 1.74 Band 1 58.06 59.02 -1.63 Band 2 57.09 56.35 1.32 Band 3 50.37 49.11 1.96 Band 4 37.4 36.76 1.74
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Enchao LIU, Yan PAN, Wei WEI, Xin LI. In-orbit calibration application and verification of Gaofen-2 satellite based on hyperspectral automatic observation equipment[J]. Journal of Atmospheric and Environmental Optics, 2024, 19(5): 599
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Received: May. 5, 2022
Accepted: --
Published Online: Jan. 8, 2025
The Author Email: Enchao LIU (liuech@aiofm.ac.cn)
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