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DOI	10.1016/j.rse.2020.111977
	The backscattering contribution of soybean pods at L-band
	Zhou Y.; Sharma A.; Kurum M.; Lang R.H.; O'Neill P.E.; Cosh M.H.
发表日期	2020
ISSN	00344257
卷号	248
英文摘要	L-band (1.25 GHz) radar measurements of a soybean canopy indicate that the emergence of seed pods is a significant contributor to the backscatter during the late stages of the growing season. In order to validate the measured data, a realistic scattering model of the soybean canopy is developed. The parameters of the soybean canopy and underlying soil used in the model vary over the growing season based on in situ measurements. Scattering amplitudes for soybean leaves are modeled analytically by using a thin disk approximation; stem and pods are jointly modeled using a numerical electromagnetic field solver. These scattering amplitudes are together incorporated into a coherent scattering model to obtain the backscattering coefficient for VV- and HH-polarizations. The modeling results show good agreement with the radar field measurements, having RMSEs of 0.51 dB for VV-pol and 1.1 dB for HH-pol. Both measured data and modeled results show that the change of soil moisture can be accurately monitored by L-band backscatter. It is also found that the difference between HH- and VV-polarized backscatter increases as the size of the soybean pods becomes larger. A method is developed here to estimate the number of pods in a soybean canopy based on polarimetric radar backscatter at L-band. © 2020 Elsevier Inc.
英文关键词	ComRAD; Radar backscatter; Soil moisture; Soybean growth and development; Soybean pods
语种	英语
scopus关键词	Backscattering; Coherent scattering; Electromagnetic fields; Radar; Soil moisture; Soil surveys; Backscattering coefficients; Coherent scattering models; Electromagnetic field solver; Field measurement; In-situ measurement; Polarimetric radars; Scattering amplitudes; Scattering model; Radar measurement; accuracy assessment; backscatter; electromagnetic field; growing season; in situ measurement; soil moisture; soybean; Glycine max
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179193
作者单位	The George Washington University, Washington, DC, United States; The Johns Hopkins Applied Physics Laboratory, Laurel, MD, United States; Mississippi State University, Mississippi State, MS, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, United States
推荐引用方式 GB/T 7714	Zhou Y.,Sharma A.,Kurum M.,et al. The backscattering contribution of soybean pods at L-band[J],2020,248.
APA	Zhou Y.,Sharma A.,Kurum M.,Lang R.H.,O'Neill P.E.,&Cosh M.H..(2020).The backscattering contribution of soybean pods at L-band.Remote Sensing of Environment,248.
MLA	Zhou Y.,et al."The backscattering contribution of soybean pods at L-band".Remote Sensing of Environment 248(2020).