[Hyperspectral estimation of leaf water content for winter wheat based on grey relational analysis (GRA)].
Guang Pu Xue Yu Guang Pu Fen Xi
; 32(11): 3103-6, 2012 Nov.
Article
en Zh
| MEDLINE
| ID: mdl-23387188
ABSTRACT
The objective of the present study was to compare two methods for the precision of estimating leaf water content (LWC) in winter wheat by combining stepwise regression method and partial least squares (SRM-PLS) or PLS based on the relational degree of grey relational analysis (GRA) between water vegetation indexes (WVIs) and LWC. Firstly, data utilized to analyze the grey relationships between LWC and the selected typical WVIs were used to determine the sensitivity of different WVIs to LWC. Secondly, the two methods of estimating LWC in winter wheat were compared, one was to directly use PLS and the other was to combine SRM and PLS, and then the method with the highest determination coefficient (R2) and lowest root mean square error (RMSE) was selected to estimate LWC in winter wheat. The results showed that the relationships between the first five WVI and LWC were stable by using GRA, and then LWC was estimated by using PLS and SRM-PLS at the whole stages with the R2 and RMSEs being 0.605 and 0.575, 4.75% and 7.35%, respectively. The results indicated that the estimation accuracy of LWC could be improved by using GRA firstly and then by using PLS and SRM-PLS.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Análisis Espectral
/
Triticum
/
Agua
/
Hojas de la Planta
Tipo de estudio:
Diagnostic_studies
Idioma:
Zh
Revista:
Guang Pu Xue Yu Guang Pu Fen Xi
Año:
2012
Tipo del documento:
Article
País de afiliación:
China