Prediction of Conifer Pigment Content Based on Color Parameters and Hyperspectral Characteristics

Yi-heng WANG; Kun SUN; Zhe WEN; Ying-bo SUO; Qu ZHANG; Ge-rong WANG; Jin-hua WEI

doi:10.3964/j.issn.1000-0593(2022)02-0537-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 2, 537(2022)

Prediction of Conifer Pigment Content Based on Color Parameters and Hyperspectral Characteristics

Yi-heng WANG^1、*, Kun SUN^1、1;, Zhe WEN^1、1;, Ying-bo SUO^2、2;, Qu ZHANG^1、1;, Ge-rong WANG^1、1;, and Jin-hua WEI^{1、1; *;}

Author Affiliations

¹1. Forestry College of Beihua University, Jilin 132013, China

²2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China

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Figures & Tables(11)

Fig. 1. Original (a) and first-order differential (b) spectral curves of conifer species

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Fig. 2. Correlation analysis between raw spectra reflectance and pigment content (a) and first order spectral reflectance (b) and pigment content of tree species

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Fig. 3. Scatter plot of measured and predicted pigment contents

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Fig. 4. Standard residual histograms and normalized residual p-p plots

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Table 1. Statistical description of pigment content in conifer species

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Table 1. Statistical description of pigment content in conifer species

色素	数据集	样本数/个	平均值	最大值	最小值	标准差	变异系数
花青素(吸光度值)	建模	144	0.170	0.273	0.117	0.029	0.172
花青素(吸光度值)	验证	36	0.164	0.222	0.113	0.028	0.174
类胡萝卜素(吸光度值)	建模	144	1.267	2.386	0.534	0.494	0.390
类胡萝卜素(吸光度值)	验证	36	1.745	2.946	0.860	0.662	0.380
叶绿素/(mg·L^-1)	建模	144	15.661	31.277	0.998	6.739	0.430
叶绿素/(mg·L^-1)	验证	36	17.738	24.584	13.176	3.614	0.204
叶绿素a/(mg·L^-1)	建模	144	11.803	22.538	4.778	4.624	0.392
叶绿素a/(mg·L^-1)	验证	36	17.539	27.412	10.194	4.531	0.258
叶绿素b/(mg·L^-1)	建模	144	4.262	8.775	1.405	1.968	0.462
叶绿素b/(mg·L^-1)	验证	36	5.823	10.435	3.056	1.986	0.341

Table 2. Correlation analysis between pigment content and color parameters of conifer species

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Table 2. Correlation analysis between pigment content and color parameters of conifer species

色彩参数	花青素	类胡萝卜素	叶绿素	叶绿素a	叶绿素b
L	-0.620^**	-0.775^**	-0.752^**	-0.797^**	-0.830^**
a^*	-0.461^*	-0.662^**	-0.644^**	-0.702^**	-0.734^**
b^*	0.329	0.525^*	0.513^*	0.569	0.588
c	-0.375	-0.575^**	-0.561^*	-0.618	-0.641
S	-0.366	-0.575^**	-0.561^*	-0.619^**	-0.644^**

Table 3. Correlation coefficient between pigment content and spectral reflectance of tree species

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Table 3. Correlation coefficient between pigment content and spectral reflectance of tree species

光谱类型	花青素		类胡萝卜素		叶绿素		叶绿素a		叶绿素b
光谱类型	波段	相关系数	波段	相关系数	波段	相关系数	波段	相关系数	波段	相关系数
原始光谱	487	0.075	676	0.001	676	0.041	676	-0.005	676	0.003
	715	-0.307^*	715	-0.533^**	715	-0.456^**	712	-0.551^**	715	-0.537^**
一阶光谱	652	0.439^**	652	0.641^**	652	0.586^**	652	0.647^**	652	0.655^**
	513	-0.519^**	700	-0.714^**	700	-0.612^**	700	-0.713^**	700	-0.722^**

Table 4. Correlation analysis between pigment content and spectral characteristic parameters of tree species

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Table 4. Correlation analysis between pigment content and spectral characteristic parameters of tree species

光谱参数	花青素	类胡萝卜素	叶绿素	叶绿素a	叶绿素b
绿峰幅值Rg	-0.286^*	-0.418^**	-0.356^**	-0.429^**	-0.420^**
红谷幅值Rr	0.041	-0.004	0.034	-0.011	-0.002
蓝边幅值Db	-0.306^*	-0.349^**	-0.285^*	-0.349^**	-0.337^**
黄边幅值Dy	-0.066	-0.016	-0.034	-0.032	-0.006
红边幅值Dr	-0.347^**	-0.598^**	-0.525^**	-0.616^**	-0.602^**
蓝边面积SDb	-0.519^**	-0.629^**	-0.544^**	-0.627^**	-0.626^**
黄边面积SDy	0.459^**	0.621^**	0.554^**	0.631^**	0.624^**
红边面积SDr	-0.087	-0.133	-0.115	-0.141	-0.140
比值植被指数RVI	-0.608^**	-0.642^**	-0.623^**	-0.677^**	-0.632^**
差值植被指数DVI	-0.575^**	-0.761^**	-0.710^**	-0.777^**	-0.694^**
归一化植被指数NDVI	0.595^**	0.713^**	0.697^**	0.770^**	0.704^**

Table 5. Pigment content and color parameter model fitting evaluation indexes of conifer species

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Table 5. Pigment content and color parameter model fitting evaluation indexes of conifer species

色素类型	相关系数r	决定系数R²	调整 R²	标准估计误差	Durbin-Watson
花青素	0.767	0.588	0.540	0.019	1.787
类胡萝卜素	0.824	0.679	0.593	0.337	1.893
叶绿素	0.799	0.638	0.542	0.194	2.090
叶绿素a	0.825	0.681	0.622	0.245	1.867
叶绿素b	0.863	0.745	0.698	1.089	2.112

Table 6. Pigment content and spectral value modem of conifer species

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Table 6. Pigment content and spectral value modem of conifer species

色素类型	相关系数r	决定系数R²	调整 R²	标准估计误差	Durbin-Watson
花青素	0.694	0.482	0.432	0.022	2.114
类胡萝卜素	0.882	0.779	0.749	0.247	1.876
叶绿素	0.785	0.616	0.565	0.205	2.097
叶绿素a	0.887	0.786	0.758	0.177	1.838
叶绿素b	0.880	0.774	0.744	0.196	1.893

Table 7. Optimal fitting model and accuracy verification

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Table 7. Optimal fitting model and accuracy verification

色素类型	模型	建模		验证
色素类型	模型	R²	RMSE	R²	RMSE
花青素	y=1.535-0.023L+0.109a^*	0.588	0.019	0.590	0.024
类胡萝卜素	y=2.618-60.118FD₆₅₂-36.335FD₇₀₀+6.329SDb+8.615SDy+0.171RVI-1.946DVI-0.424NDVI	0.779	0.224	0.770	0.345
叶绿素	y=292.089-5.673L+48.308a^-19.202b^-0.185S	0.638	0.201	0.636	0.215
叶绿素a	y=19.369-1760.51FD₆₅₂-266.4FD₇₀₀+96.842SDb+165.019SDy+3.78RVI-3.82DVI+16.352NDVI	0.786	0.187	0.777	0.214
叶绿素b	y=16.161+2406.3FD₆₅₂-337.164FD₇₀₀-26.171SDb-165.976SDy-2.781RVI-23.02DVI-27.467NDVI	0.774	0.179	0.764	0.184

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Yi-heng WANG, Kun SUN, Zhe WEN, Ying-bo SUO, Qu ZHANG, Ge-rong WANG, Jin-hua WEI. Prediction of Conifer Pigment Content Based on Color Parameters and Hyperspectral Characteristics[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 537

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Paper Information

Category: Research Articles

Received: Jan. 21, 2021

Accepted: Feb. 24, 2021

Published Online: Apr. 2, 2022

The Author Email: WANG Yi-heng (1873900274@qq.com)

DOI:10.3964/j.issn.1000-0593(2022)02-0537-07

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology