Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value
Chlorophyll content is an important indicator of plant photosynthesis, which directly affects the growth and yield of crops. Using hyperspectral imaging technology to quickly and non-destructively estimate the soil plant analysis development (SPAD) value of pepper leaf and its distribution inversion...
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MDPI AG
2021-12-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/1/183 |
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| author | Ziran Yuan Yin Ye Lifei Wei Xin Yang Can Huang |
| author_facet | Ziran Yuan Yin Ye Lifei Wei Xin Yang Can Huang |
| author_sort | Ziran Yuan |
| collection | DOAJ |
| description | Chlorophyll content is an important indicator of plant photosynthesis, which directly affects the growth and yield of crops. Using hyperspectral imaging technology to quickly and non-destructively estimate the soil plant analysis development (SPAD) value of pepper leaf and its distribution inversion is of great significance for agricultural monitoring and precise fertilization during pepper growth. In this study, 150 samples of pepper leaves with different leaf positions were selected, and the hyperspectral image data and SPAD value were collected for the sampled leaves. The correlation coefficient, stability competitive adaptive reweighted sampling (sCARS), and iteratively retaining informative variables (IRIV) methods were used to screen characteristic bands. These were combined with partial least-squares regression (PLSR), extreme gradient boosting (XGBoost), random forest regression (RFR), and gradient boosting decision tree (GBDT) to build regression models. The developed model was then used to build the inversion map of pepper leaf chlorophyll distribution. The research results show that: (1) The IRIV-XGBoost model demonstrates the most comprehensive performance in the modeling and inversion stages, and its <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>R</mi><mrow><mi>c</mi><mi>v</mi></mrow><mn>2</mn></msubsup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><mi>M</mi><mi>S</mi><msub><mi>E</mi><mrow><mi>c</mi><mi>v</mi></mrow></msub></mrow></semantics></math></inline-formula>, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi><mi>A</mi><msub><mi>E</mi><mrow><mi>c</mi><mi>v</mi></mrow></msub></mrow></semantics></math></inline-formula> are 0.81, 2.76, and 2.30, respectively; (2) The IRIV-XGBoost model was used to calculate the SPAD value of each pixel of pepper leaves, and to subsequently invert the chlorophyll distribution map of pepper leaves at different leaf positions, which can provide support for the intuitive monitoring of crop growth and lay the foundation for the development of hyperspectral field dynamic monitoring sensors. |
| first_indexed | 2024-03-10T03:22:09Z |
| format | Article |
| id | doaj.art-8068f4e4bc9245488df686a5c8dd598d |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T03:22:09Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
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| spelling | doaj.art-8068f4e4bc9245488df686a5c8dd598d2023-11-23T12:18:12ZengMDPI AGSensors1424-82202021-12-0122118310.3390/s22010183Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD ValueZiran Yuan0Yin Ye1Lifei Wei2Xin Yang3Can Huang4Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, ChinaSoil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, ChinaFaculty of Resources and Environmental Science, Hubei University, Wuhan 430062, ChinaSoil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, ChinaFaculty of Resources and Environmental Science, Hubei University, Wuhan 430062, ChinaChlorophyll content is an important indicator of plant photosynthesis, which directly affects the growth and yield of crops. Using hyperspectral imaging technology to quickly and non-destructively estimate the soil plant analysis development (SPAD) value of pepper leaf and its distribution inversion is of great significance for agricultural monitoring and precise fertilization during pepper growth. In this study, 150 samples of pepper leaves with different leaf positions were selected, and the hyperspectral image data and SPAD value were collected for the sampled leaves. The correlation coefficient, stability competitive adaptive reweighted sampling (sCARS), and iteratively retaining informative variables (IRIV) methods were used to screen characteristic bands. These were combined with partial least-squares regression (PLSR), extreme gradient boosting (XGBoost), random forest regression (RFR), and gradient boosting decision tree (GBDT) to build regression models. The developed model was then used to build the inversion map of pepper leaf chlorophyll distribution. The research results show that: (1) The IRIV-XGBoost model demonstrates the most comprehensive performance in the modeling and inversion stages, and its <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>R</mi><mrow><mi>c</mi><mi>v</mi></mrow><mn>2</mn></msubsup></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><mi>M</mi><mi>S</mi><msub><mi>E</mi><mrow><mi>c</mi><mi>v</mi></mrow></msub></mrow></semantics></math></inline-formula>, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>M</mi><mi>A</mi><msub><mi>E</mi><mrow><mi>c</mi><mi>v</mi></mrow></msub></mrow></semantics></math></inline-formula> are 0.81, 2.76, and 2.30, respectively; (2) The IRIV-XGBoost model was used to calculate the SPAD value of each pixel of pepper leaves, and to subsequently invert the chlorophyll distribution map of pepper leaves at different leaf positions, which can provide support for the intuitive monitoring of crop growth and lay the foundation for the development of hyperspectral field dynamic monitoring sensors.https://www.mdpi.com/1424-8220/22/1/183pepper leafSPAD valuehyperspectral inversioncharacteristic waveband selection |
| spellingShingle | Ziran Yuan Yin Ye Lifei Wei Xin Yang Can Huang Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value Sensors pepper leaf SPAD value hyperspectral inversion characteristic waveband selection |
| title | Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value |
| title_full | Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value |
| title_fullStr | Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value |
| title_full_unstemmed | Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value |
| title_short | Study on the Optimization of Hyperspectral Characteristic Bands Combined with Monitoring and Visualization of Pepper Leaf SPAD Value |
| title_sort | study on the optimization of hyperspectral characteristic bands combined with monitoring and visualization of pepper leaf spad value |
| topic | pepper leaf SPAD value hyperspectral inversion characteristic waveband selection |
| url | https://www.mdpi.com/1424-8220/22/1/183 |
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