Measurement of reflectance factors under daily and intermittent irradiance variations

Arthur J. Richardson

doi:10.1364/AO.20.003336

Applied Optics
Vol. 20,
Issue 19,
pp. 3336-3340
(1981)
•https://doi.org/10.1364/AO.20.003336

Measurement of reflectance factors under daily and intermittent irradiance variations

Arthur J. Richardson

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Arthur J. Richardson, "Measurement of reflectance factors under daily and intermittent irradiance variations," Appl. Opt. 20, 3336-3340 (1981)

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Abstract

A technique for measuring reflectance factors in diurnal and intermittent cloud insolation conditions using hand-held radiometers has been developed. Simultaneously collected reference panel and total insolation measurements were obtained during the South Texas summer growing season (April and May 1980) at Weslaco, Tex., using the GSFC MARK2 three-band hand-held radiometer. The estimated reflectance factors of four reference panels using the hand-held radiometer agreed closely with the expected reflectance as measured with a laboratory spectrophotometer over a wide range of insolation readings (from 20 to 91 mW/cm ²). These results indicate that this technique could prove useful for achieving uniform reflectance factor measurements for remote sensing studies.

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Reference panel paint	RED (0.63–0.69 μm) (%)	RIR (0.76–0.90 μm) (%)	Mean (%)
White	98.0	100.0	99.0
White and black mixture	55.1	52.2	53.7
White and black mixture	34.6	31.4	33.0
Black	2.3	2.3	2.3

Panel	Panel statistics	Grass background reflectance			Bare soil background reflectance

		4/25/80	5/21/80	5/27/80	4/18/80	5/6/80	5/22/80
All	N	54	47	32	47	35	20
	r	0.998d	0.997d	0.998d	0.998d	0.997d	0.997d
	Ko	1.438	−1.564	−0.945	0.076	−0.159	0.172
	Kl	0.549	0.556	0.544	0.569	0.564	0.562
2%	N	13	12	8	10	9	5
	r	0.978d	0.988d	0.997d	0.993d	0.931d	0.899d
	Ao	0.568	0.034	0.324	−0.154	−0.004	−0.707
	Al	0.182	0.176	0.188	0.156	0.142	0.153
33%	N	14	12	8	12	8	5
	r	0.994d	0.976d	0.999d	0.998d	0.990d	0.991d
	Ao	2.174	1.603	0.726	−0.235	−1.151	0.649
	Al	0.655	0.651	0.674	0.651	0.679	0.641
54%	N	13	12	8	13	9	5
	r	0.998d	0.990d	0.999d	0.996d	0.997d	0.991d
	Ao	1.258	4.136	−0.494	−0.200	4.374	−0.040
	Al	0.970	0.952	1.025	0.963	0.922	0.980
99%	N	14	11	8	12	9	5
	rd	0.996d	0.995d	0.999d	0.999d	0.998d	0.986d
	Ao	2.179	2.896	−1.809	0.042	1.963	0.577
	Al	1.583	1.594	1.707	1.597	1.571	1.573

Reference panel paint	RED (0.63–0.69 μm) (%)	RIR (0.76–0.90 μm) (%)	Mean (%)
White	98.0	100.0	99.0
White and black mixture	55.1	52.2	53.7
White and black mixture	34.6	31.4	33.0
Black	2.3	2.3	2.3

Panel	Panel statistics	Grass background reflectance			Bare soil background reflectance

		4/25/80	5/21/80	5/27/80	4/18/80	5/6/80	5/22/80
All	N	54	47	32	47	35	20
	r	0.998d	0.997d	0.998d	0.998d	0.997d	0.997d
	Ko	1.438	−1.564	−0.945	0.076	−0.159	0.172
	Kl	0.549	0.556	0.544	0.569	0.564	0.562
2%	N	13	12	8	10	9	5
	r	0.978d	0.988d	0.997d	0.993d	0.931d	0.899d
	Ao	0.568	0.034	0.324	−0.154	−0.004	−0.707
	Al	0.182	0.176	0.188	0.156	0.142	0.153
33%	N	14	12	8	12	8	5
	r	0.994d	0.976d	0.999d	0.998d	0.990d	0.991d
	Ao	2.174	1.603	0.726	−0.235	−1.151	0.649
	Al	0.655	0.651	0.674	0.651	0.679	0.641
54%	N	13	12	8	13	9	5
	r	0.998d	0.990d	0.999d	0.996d	0.997d	0.991d
	Ao	1.258	4.136	−0.494	−0.200	4.374	−0.040
	Al	0.970	0.952	1.025	0.963	0.922	0.980
99%	N	14	11	8	12	9	5
	rd	0.996d	0.995d	0.999d	0.999d	0.998d	0.986d
	Ao	2.179	2.896	−1.809	0.042	1.963	0.577
	Al	1.583	1.594	1.707	1.597	1.571	1.573

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Applied Optics