A New Method for Direct Measurement of Land Surface Reflectance With UAV-Based Multispectral Cameras

Hua-sheng SUN; Yuan ZHANG; Yun-fei SHI; Min ZHAO

doi:10.3964/j.issn.1000-0593(2022)05-1581-07

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 5 >Page 1581 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 5, 1581 (2022)

A New Method for Direct Measurement of Land Surface Reflectance With UAV-Based Multispectral Cameras

Hua-sheng SUN^1、*, Yuan ZHANG^{2、2; *;}, Yun-fei SHI^1、1;, and Min ZHAO^1、1;

Author Affiliations

¹1. Shandong Provincial Key Laboratory of Soil and Water Conservation and Environmental Protection, School of Resources and Environment, Linyi University, Linyi 276000, China

²2. Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences & Institute of Eco-Chongming, East China Normal University, Shanghai 200241, China

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DOI: 10.3964/j.issn.1000-0593(2022)05-1581-07 Cite this Article

Hua-sheng SUN, Yuan ZHANG, Yun-fei SHI, Min ZHAO. A New Method for Direct Measurement of Land Surface Reflectance With UAV-Based Multispectral Cameras[J]. Spectroscopy and Spectral Analysis, 2022, 42(5): 1581 Copy Citation Text

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Fig. 1. DJI Phantom 4 RTK multispectral UAV and its imaging system

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Fig. 2. The black, gray and white reference panels and their hyperspectral test results

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Fig. 3. Measured solar irradiance (E_m) by sensor and calculated the irradiance reaching ground (E_g)
(a): 2020-7-20 14:51—15:07 E_m; (b): 2020-7-20 14:51—15:07 E_g; (c): 2020-9-23 16:08—16:24 E_m;(d): 2020-9-23 16:08—16:24 E_g; (e): 2020-11-13 13:37—13:53 E_m; (f): 2020-11-13 13:37—13:53 E_g;(g): 2020-11-29 13:52—14:09 E_m; (h): 2020-11-29 13:52—14:09 E_g

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波段	波长范围/nm
蓝(B)	450±16
绿(G)	560±16
红(R)	650±16
红边(RE)	730±16
近红外(NIR)	840±26

Table 1. Sensor parameters of DJI Phantom 4 RTK multispectral UAV

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参考板	波段
参考板	蓝(B)	绿(G)	红(R)	红边 (RE)	近红外 (NIR)
黑	7.07%	6.39%	6.00%	5.91%	6.10%
灰	25.69%	24.71%	23.48%	23.53%	23.79%
白	85.52%	81.48%	80.61%	81.73%	80.54%

Table 2. Average reflectances of the reference panels measured by a hyper spectrometer

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航拍日期	波段
航拍日期	蓝(B)	绿(G)	红(R)	红边 (RE)	近红外 (NIR)
2020/7/20	84.57%	89.33%	89.24%	85.73%	82.90%
2020/9/23	31.41%	33.60%	34.54%	34.31%	34.07%
2020/11/13	76.07%	78.80%	83.78%	87.66%	90.74%
2020/11/29	63.25%	65.41%	70.58%	75.08%	78.78%

Table 3. Direct solar irradiance proportion (p) of each band during the image collection period

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航拍日期		波段
航拍日期		蓝(B)	绿(G)	红(R)	红边 (RE)	近红外 (NIR)
	黑	5.71%	5.58%	5.67%	6.08%	7.01%
2020-7-20	灰	20.79%	22.67%	21.55%	21.82%	22.30%
	白	80.50%	82.18%	82.98%	85.79%	82.61%
	黑	6.29%	5.78%	6.02%	6.52%	7.40%
2020-9-23	灰	21.83%	21.75%	20.98%	21.75%	21.76%
	白	81.17%	79.37%	79.91%	81.97%	78.22%
	黑	6.93%	7.37%	7.21%	7.68%	8.09%
2020-11-13	灰	21.88%	22.33%	22.33%	23.12%	22.55%
	白	78.96%	80.33%	82.99%	85.79%	83.19%
	黑	6.45%	6.41%	6.73%	6.88%	7.24%
2020-11-29	灰	22.20%	23.47%	23.44%	23.55%	23.03%
	白	80.26%	82.76%	84.62%	87.58%	82.26%

Table 4. Average reflectances of the reference panels derived from the UAV-based multispectral images

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