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Sensors 2013, 13(3), 3109-3130; doi:10.3390/s130303109

Article

Comparison and Intercalibration of Vegetation Indices from Different Sensors for Monitoring Above-Ground Plant Nitrogen Uptake in Winter Wheat

Xinfeng Yao, Xia Yao, Wenqing Jia, Yongchao Tian, Jun Ni, Weixing Cao and Yan Zhu*

National Engineering and Technology Center for Information Agriculture, Jiangsu Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China

* Author to whom correspondence should be addressed.

Received: 14 November 2012; in revised form: 15 January 2013 / Accepted: 19 February 2013 / Published: 5 March 2013

(This article belongs to the Special Issue Sensor-Based Technologies and Processes in Agriculture and Forestry)

Download PDF Full-Text [496 KB, uploaded 5 March 2013 11:13 CET]

Abstract: Various sensors have been used to obtain the canopy spectral reflectance for monitoring above-ground plant nitrogen (N) uptake in winter wheat. Comparison and intercalibration of spectral reflectance and vegetation indices derived from different sensors are important for multi-sensor data fusion and utilization. In this study, the spectral reflectance and its derived vegetation indices from three ground-based sensors (ASD Field Spec Pro spectrometer, CropScan MSR 16 and GreenSeeker RT 100) in six winter wheat field experiments were compared. Then, the best sensor (ASD) and its normalized difference vegetation index (NDVI (807, 736)) for estimating above-ground plant N uptake were determined (R² of 0.885 and RMSE of 1.440 g·N·m⁻² for model calibration). In order to better utilize the spectral reflectance from the three sensors, intercalibration models for vegetation indices based on different sensors were developed. The results indicated that the vegetation indices from different sensors could be intercalibrated, which should promote application of data fusion and make monitoring of above-ground plant N uptake more precise and accurate.

Keywords: sensors; spectral reflectance; vegetation index; above-ground plant nitrogen uptake; estimating model; comparison; intercalibration; winter wheat

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