A COUPLED RETRIEVAL OF COLUMNAR WATER VAPOR AND CANOPY WATER CONTENT FROM SPACEBORNE HYPERSPECTRAL MEASUREMENTS

被引：1
|
作者：
Bohn, Niklas [1 ]
Kuester, Theres [1 ]
Segl, Karl [1 ]
Guanter, Luis [1 ]
机构：
[1] GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany
来源：
2019 10TH WORKSHOP ON HYPERSPECTRAL IMAGING AND SIGNAL PROCESSING - EVOLUTION IN REMOTE SENSING (WHISPERS) | 2019年
关键词：
canopy water content; water vapor; imaging spectroscopy; hyperspectral; EnMAP; IMAGING SPECTROSCOPY; LEAF; REFLECTANCE;
D O I：
10.1109/whispers.2019.8920860
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Imaging spectroscopy allows to identify and quantify water in different states based upon their discriminative absorption lines in the solar spectrum. We developed a coupled columnar water vapor (CWV) and canopy water content (CWC) retrieval method for spaceborne hyperspectral measurements like DESIS, PRISMA or the upcoming EnMAP mission. We linked the MODTRAN radiative transfer code to a surface reflectance model based on the Beer-Lambert law and quantified uncertainties using the maximum likelihood estimation. We simulated EnMAP TOA radiances using a coupling of PROSPECT, HySimCaR and EeteS. CWV and CWC were retrieved showing an R-2 of 0.991 and 0.965, respectively. We observed a systematic overestimation of CWC by a factor of 3.374 since our model does not take into account volume scattering and different penetration depths within the canopy.
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页数：5
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