气候变化领域集成服务门户(CCPortal): Coupled retrieval of the three phases of water from spaceborne imaging spectroscopy measurements

CCPortal

DOI	10.1016/j.rse.2020.111708
	Coupled retrieval of the three phases of water from spaceborne imaging spectroscopy measurements
	Bohn N.; Guanter L.; Kuester T.; Preusker R.; Segl K.
发表日期	2020
ISSN	00344257
卷号	242
英文摘要	Measurements of reflected solar radiation by imaging spectrometers can quantify water in different states (solid, liquid, gas) thanks to the discriminative absorption shapes. We developed a retrieval method to quantify the amount of water in each of the three states from spaceborne imaging spectroscopy data, such as those from the German EnMAP mission. The retrieval couples atmospheric radiative transfer simulations from the MODTRAN5 radiative transfer code to a surface reflectance model based on the Beer-Lambert law. The model is inverted on a per-pixel basis using a maximum likelihood estimation formalism. Based on a unique coupling of the canopy reflectance model HySimCaR and the EnMAP end-to-end simulation tool EeteS, we performed a sensitivity analysis by comparing the retrieved values with the simulation input leading to an R2 of 0.991 for water vapor and 0.965 for liquid water. Furthermore, we applied the algorithm to airborne AVIRIS-C data to demonstrate the ability to map snow/ice extent as well as to a CHRIS-PROBA dataset for which concurrent field measurements of canopy water content were available. The comparison between the retrievals and the ground measurements showed an overall R2 of 0.80 for multiple crop types and a remarkable clustering in the regression analysis indicating a dependency of the retrieved water content from the physical structure of the vegetation. In addition, the algorithm is able to produce smoother and more physically-plausible water vapor maps than the ones from the band ratio approaches used for multispectral data, since biases due to background reflectance are reduced. The demonstrated potential of imaging spectroscopy to provide accurate quantitative measures of water from space will be further exploited using upcoming spaceborne imaging spectroscopy missions like PRISMA or EnMAP. © 2020 Elsevier Inc.
英文关键词	Atmospheric correction; Canopy water content; EnMAP; Imaging spectroscopy; Water vapor
语种	英语
scopus关键词	Maximum likelihood estimation; Radiative transfer; Reflection; Regression analysis; Sensitivity analysis; Spectrometers; Spectrum analysis; Water vapor; Atmospheric corrections; Atmospheric radiative transfer simulation; Canopy reflectance model; Canopy water contents; EnMAP; Imaging spectroscopy; Radiative transfer codes; Surface reflectance models; Water absorption; algorithm; atmospheric correction; canopy reflectance; radiative transfer; regression analysis; SIR; solar radiation; spectroscopy; surface reflectance; water content; water vapor
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/179346
作者单位	GFZ German Research Centre for Geosciences, Remote Sensing and Geoinformatics, Telegrafenberg, Potsdam, 14473, Germany; Centro de Tecnologías Físicas, Universitat Politècnica de València, Camí de Vera s/nValencia 46022, Spain; Freie Universitaet Berlin, Department of Earth Sciences, Institute for Space Sciences, Carl-Heinrich-Becker-Weg 6-10, Berlin, 12165, Germany
推荐引用方式 GB/T 7714	Bohn N.,Guanter L.,Kuester T.,et al. Coupled retrieval of the three phases of water from spaceborne imaging spectroscopy measurements[J],2020,242.
APA	Bohn N.,Guanter L.,Kuester T.,Preusker R.,&Segl K..(2020).Coupled retrieval of the three phases of water from spaceborne imaging spectroscopy measurements.Remote Sensing of Environment,242.
MLA	Bohn N.,et al."Coupled retrieval of the three phases of water from spaceborne imaging spectroscopy measurements".Remote Sensing of Environment 242(2020).