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Estimation of Volume Fraction and Gravimetric Moisture of Winter Wheat Based on Microwave Attenuation: A Field Scale Study
Meyer, T.; Jagdhuber, T.; Piles, M. et al.
2019In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, Proceedings
Peer reviewed
 

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Keywords :
L-band; SMAP; SMOS; Budget control; Crops; Geology; Microwave measurement; Optical properties; Remote sensing; Volume fraction; Vegetation optical depth; Vegetation water content; Winter wheat; Vegetation
Abstract :
[en] A considerable amount of water can be stored in vegetation, especially in regions experiencing large quantities of precipitation (mid-latitudes). In this context, an accurate estimate of the actual water status of the vegetation could lead to an improved understanding of the effect of plant water on the water budget. In this study, we developed and validated a novel approach to retrieve the vegetation volume fraction (δ) (i.e., volume percentage of solid plant material of a canopy in air) and the gravimetric vegetation water content (mg) (i.e., amount of water per wet biomass) for winter wheat. The estimation was based on the attenuation of L-band microwave measurements through vegetation (vegetation optical depth, (τ)-parameter). Ground-based L-band microwave measurements over an entire growing cycle together with in situ measured vegetation characteristics have been used for this purpose. Retrieved δ- and mg-values revealed to be comparable to literature and in situ measurements (i.e., δ was within the range between 0 and 0.01 and the retrieved mg had a mean value of 0.58 (0.55 (in situ) and 0.54 (literature))). Finally, we also tested the sensitivity of the δ- and mg-retrievals to their input-values to investigate their possible mutual dependencies. The analysis showed that already small changes in the input-mg or -δ result in relatively large changes in the retrieved δ or mg. © 2019 IEEE.
Disciplines :
Environmental sciences & ecology
Earth sciences & physical geography
Author, co-author :
Meyer, T.;  Forschungszentrum Jülich GmbH, Agrosphere (IBG-3), Jülich, 52428, Germany
Jagdhuber, T.;  Microwaves and Radar Institute, German Aerospace Center, Wessling, 82234, Germany
Piles, M.;  University of Valencia, Image Processing Lab, Paterna, Valencia, 46980, Spain
Fluhrer, A.;  Microwaves and Radar Institute, German Aerospace Center, Wessling, 82234, Germany
Jonard, François  ;  Université de Liège - ULiège > Département de géographie > Systèmes d'information géographiques
Language :
English
Title :
Estimation of Volume Fraction and Gravimetric Moisture of Winter Wheat Based on Microwave Attenuation: A Field Scale Study
Publication date :
2019
Event name :
International Geoscience and Remote Sensing Symposium (IGARSS)
Event date :
From 02-07-2019 to 02-08-2019
Audience :
International
Main work title :
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, Proceedings
Publisher :
Institute of Electrical and Electronics Engineers Inc.
ISBN/EAN :
978-1-66540-369-6
Peer reviewed :
Peer reviewed
Commentary :
9781538691540
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since 23 September 2021

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