气候变化领域集成服务门户(CCPortal): Estimating statistical errors in retrievals of ice velocity and deformation parameters from satellite images and buoy arrays

CCPortal

DOI	10.5194/tc-14-2999-2020
	Estimating statistical errors in retrievals of ice velocity and deformation parameters from satellite images and buoy arrays
	Dierking W.; Stern H.L.; Hutchings J.K.
发表日期	2020
ISSN	19940416
起始页码	2999
结束页码	3016
卷号	14 期号:9
英文摘要	The objective of this note is to provide the background and basic tools to estimate the statistical error of deformation parameters that are calculated from displacement fields retrieved from synthetic aperture radar (SAR) imagery or from location changes of position sensors in an array. We focus here specifically on sea ice drift and deformation. In the most general case, the uncertainties of divergence/convergence, shear, vorticity, and total deformation are dependent on errors in coordinate measurements, the size of the area and the time interval over which these parameters are determined, as well as the velocity gradients within the boundary of the area. If displacements are calculated from sequences of SAR images, a tracking error also has to be considered. Timing errors in position readings are usually very small and can be neglected. We give examples for magnitudes of position and timing errors typical for buoys and SAR sensors, in the latter case supplemented by magnitudes of the tracking error, and apply the derived equations on geometric shapes frequently used for deriving deformation from SAR images and buoy arrays. Our case studies show that the size of the area and the time interval for calculating deformation parameters have to be chosen within certain limits to make sure that the uncertainties are smaller than the magnitude of deformation parameters. © 2020 Author(s).
英文关键词	displacement; error analysis; field method; parameter estimation; satellite data; satellite imagery; shear stress; synthetic aperture radar; uncertainty analysis
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202066
作者单位	Center for Integrated Remote Sensing and Forecasting for Arctic Operations, UiT, Arctic University of Norway, Tromsø, 9019, Norway; Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, 27570, Germany; Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98105, United States; College of Earth Ocean, and Atmospheric Sciences, Oregon State University, 104 Ceoas Administration Building, Corvallis, OR 97331, United States
推荐引用方式 GB/T 7714	Dierking W.,Stern H.L.,Hutchings J.K.. Estimating statistical errors in retrievals of ice velocity and deformation parameters from satellite images and buoy arrays[J],2020,14(9).
APA	Dierking W.,Stern H.L.,&Hutchings J.K..(2020).Estimating statistical errors in retrievals of ice velocity and deformation parameters from satellite images and buoy arrays.Cryosphere,14(9).
MLA	Dierking W.,et al."Estimating statistical errors in retrievals of ice velocity and deformation parameters from satellite images and buoy arrays".Cryosphere 14.9(2020).