Yufeng Ge

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Temporal dynamics of maize plant growth, water use, and leaf water content using automated high throughput RGB and hyperspectral imaging" (2016). Keywords: Drought High throughput phenotyping Hyperspectral Image processing RGB Water use efficiency a b s t r a c t Automated collection of large scale plant phenotype datasets using high throughput imaging(More)
In the United States, petroleum extraction, refinement, and transportation present countless opportunities for spillage mishaps. A method for rapid field appraisal and mapping of petroleum hydrocarbon-contaminated soils for environmental cleanup purposes would be useful. Visible near-infrared (VisNIR, 350-2500 nm) diffuse reflectance spectroscopy (DRS) is a(More)
Near-infrared reflectance spectroscopy (NIRS) has been widely used in precision agriculture to quantitatively assess properties of many agricultural objects. The accuracy of NIRS depends largely on an adequate data analysis technique to preprocess raw spectroscopic data. A method for incorporating wavelet analysis as a preprocessing tool into NIRS was(More)
a r t i c l e i n f o In the literature of visible and near infrared diffuse reflectance spectroscopy (VNIR-DRS) for soil characterization, the effects of instruments and scanning environments on reflectance spectra and calibration models have not been well documented. To fill this knowledge gap, the goal of this study is to compare soil reflectance spectra(More)
Fifty-five compost samples were collected and scanned as received by visible and near-IR (VisNIR, 350-2500 nm) diffuse reflectance spectroscopy. The raw reflectance and first-derivative spectra were used to predict log(10)-transformed organic matter (OM) using partial least squares (PLS) regression, penalized spline regression (PSR), and boosted regression(More)
http://dx.doi.org/10.1016/j.compag.2016.08.021 0168-1699/ 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). ⇑ Corresponding author at: Department of Biological Systems Engineering, 209 Chase Hall, East Campus, University of Nebraska-Lincoln, Lincoln,(More)
A system including wireless-communication and GPS technologies was designed, constructed and field tested to enable site-specific crop management in cotton production in the form of fiber-quality mapping. The system is comprised of three functional sub-systems associated with the three machines typically used in cotton harvesting: harvester, boll buggy and(More)
Visible near-infrared (VisNIR) diffuse reflectance spectroscopy (DRS) is a rapid, non-destructive method for sensing the presence and amount of total petroleum hydrocarbon (TPH) contamination in soil. This study demonstrates the feasibility of VisNIR DRS to be used in the field to proximally sense and then map the areal extent of TPH contamination in soil.(More)
In-situ soil sensor systems based on visible and near infrared spectroscopy is not yet been effectively used due to inadequate studies to utilize legacy spectral libraries under the field conditions. The performance of such systems is significantly affected by spectral discrepancies created by sample intactness and library differences. In this study, four(More)
ii ACKNOWLEDGEMENTS I would like to acknowledge my advisor Dr. David Weindorf for his continuous encouragement and support, for providing me with the opportunity to pursue graduate education and for the many occasions to travel and learn. I would also like to thank my committee members, Dr. Sabliov and Dr. Motsenbocker for their invaluable guidance and help(More)