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Journal of Applied Remote Sensing

Estimation of winter wheat grain crude protein content from in situ reflectance and advanced spaceborne thermal emission and reflection radiometer image
Author(s): Wenjiang Huang; Xiaoyu Song; David William Lamb; Zhijie Wang; Zheng Niu; Liangyun Liu; Jihua Wang
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Paper Abstract

The advanced technology in site-specific and spaceborne determination of grain crude protein content (CP) by remote sensing can help optimize the strategies for buyers in aiding purchasing decisions, and help farmers to maximize the grain output by adjusting field nitrogen (N) fertilizer inputs. We performed field experiments to study the relationship between grain quality indicators and foliar nitrogen concentration (FNC). FNC at anthesis stage was significantly correlated with CP, while spectral vegetation index was significantly correlated to FNC. Based on the relationships among nitrogen reflectance index (NRI), FNC and CP, a model for CP prediction was developed. NRI was able to evaluate FNC with a higher coefficient of determination of R2= 0.7302 in Experiment A. The relationship between laboratory measured and remotely sensed FNC had a coefficient of determination of R2=0.7279 in Experiment B. The method developed in this study could contribute towards developing optimal procedures for evaluating wheat grain quality by in situ canopy-reflected spectrum and ASTER image at anthesis stage. CP derived from both in situ spectrum and the ASTER image exhibited high accuracy and the precision in Experiment C. The RMSE were 0.893% for in situ spectrum model and 1.654% for ASTER image model, and the R2 were 0.7661 and 0.7194 for both, respectively. It is thus feasible to forecast grain quality by NRI derived from in situ canopy-reflected spectrum and ASTER image. Our results indicated that the inversion of FNC and the evaluation of CP by NRI were surprisingly good.

Paper Details

Date Published: 1 July 2008
PDF: 13 pages
J. Appl. Remote Sens. 2(1) 023530 doi: 10.1117/1.2968954
Published in: Journal of Applied Remote Sensing Volume 2, Issue 1
Show Author Affiliations
Wenjiang Huang, National Engineering Research Ctr. for Information Technology (China)
Xiaoyu Song, National Engineering Research Ctr. for Information Technology (China)
David William Lamb, Univ. of New England (Australia)
Zhijie Wang, National Engineering Research Ctr. for Information Technology (China)
Zheng Niu, Beijing Normal Univ. (China)
Liangyun Liu, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Jihua Wang, National Engineering Research Ctr. for Information Technology (China)


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