title: Comparison and intercalibration of vegetation indices from different sensors for monitoring above-ground plant nitrogen uptake in winter wheat.
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.
authors: National Engineering and Technology Center for Information Agriculture, Jiangsu Key Laboratory for Information Agriculture, Nanjing Agricultural University, Nanjing 210095, China. xinfengyao@saas.sh.cn
authors: Xinfeng
authors: X
authors: Yao
authors: Xia
authors: X
authors: Yao
authors: Wenqing
authors: W
authors: Jia
authors: Yongchao
authors: Y
authors: Tian
authors: Jun
authors: J
authors: Ni
authors: Weixing
authors: W
authors: Cao
authors: Yan
authors: Y
authors: Zhu
mesh_terms: D015374:Biosensing Techniques; D009584:Nitrogen / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000378:metabolism; D012621:Seasons; D013472:Sunlight; D014908:Triticum / Q000254:growth & development / Q000378:metabolism*
chemical_list: D009584:Nitrogen