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Dependence of attenuation in a vegetation canopy on frequency and plant water content
IEEE Transactions on Geoscience and Remote Sensing, 1996Theory is presented to provide insight into the observation that attenuation through vegetation is proportional to vegetation water content. In this analysis, the canopy is modeled as a sparse layer of randomly oriented particles (leaves, stalks, etc.) over a flat, homogeneous ground plane (soil) and an expression is obtained for the "optical depth ...
David M. Le Vine, Mostafa A. Karam
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Retrieval of canopy water content using objective based method
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016The robust and accurate retrieval of biophysical vegetation variables from remotely sensed data using radiative transfer models (RTMs) has been generally hampered by the ill-posed inverse problem. To alleviate this issue and improve the retrieval accuracy, a two-step inversion method based on the PROSAIL (PROSPECT+SAIL) radiative transfer model has ...
Dasong Xu, Binbin He, Xingwen Quan
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Retrieval of canopy water content using multiple priori inromation
2014 IEEE Geoscience and Remote Sensing Symposium, 2014The retrieval of parameters through a physical mechanism model is promising for its generality but is challenged by the ill-posed inversion problem. This study focused on the use of multiple priori information to alleviate the ill-posed inversion problem.
Xingwen Quan +5 more
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Estimation of canopy water content with MODIS spectral index
SPIE Proceedings, 2009Canopy water content is an important variable for forestry and agriculture management. This study was aimed at building calibration models to estimate vegetation canopy (VC) equivalent water thickness (EWT) from high temporal resolution and large areal coverage MODIS images.
Zuoning Jiang, Lin Li, Susan L. Ustin
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CANOPY AND LEAF LIGHT REFLECTANCE FEATURES IN RELATION TO WATER CONTENT IN APPLE
Acta Horticulturae, 2004The relationship between spectral light reflectance and leaf water content has been established for several species, giving a sound basis to the use of remote sensing technologies in water stress detection for natural vegetation and crops. Nevertheless, few data are available about fruit tree species.
O Facini, S Loreti, F Rossi, C Bignami
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Continuous observation of canopy water content changes with GPS sensors
2021<p>Canopy water content is a direct indicator of vegetation water use and hydraulic stress, reflecting how ecosystems respond and adapt to droughts and heatwaves. It represents an interesting target for Earth system models which attempt to predict the response and resilience of the vegetation in the face of changing climatic conditions ...
Vincent Humphrey +2 more
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SPIE Proceedings, 2011
Leaf and canopy water contents provide information for leaf area index, vegetation biomass, and wildfire fuel moisture content. Hyperspectral retrievals of leaf and canopy water content are determined from the relationship of spectral reflectance and the specific absorption coefficient of water over the wavelength range of a water absorption feature.
E. Raymond Hunt, Jr. +4 more
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Leaf and canopy water contents provide information for leaf area index, vegetation biomass, and wildfire fuel moisture content. Hyperspectral retrievals of leaf and canopy water content are determined from the relationship of spectral reflectance and the specific absorption coefficient of water over the wavelength range of a water absorption feature.
E. Raymond Hunt, Jr. +4 more
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[Discussion on hyperspectral index for the estimation of cotton canopy water content].
Guang pu xue yu guang pu fen xi = Guang pu, 2014Proper vegetation indices have decisive influences on the precision of hyperspectral estimation models for surface parameters. In the present paper, in order to find the proper hyperspectral indices for cotton canopy water content estimation, two water parameters for cotton canopy water content (EWT(canopy), equivalent water thickness; VWC, vegetation ...
Qiang, Wang +3 more
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2019 10th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS), 2019
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
Niklas Bohn +3 more
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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
Niklas Bohn +3 more
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Drivers of woody canopy water content responses to drought in a Mediterranean‐type ecosystem
Ecological Applications, 2017AbstractSevere droughts increase physiological stress in woody plant species, which can lead to mortality, fundamentally altering the composition, structure, and biogeography of forests in many regions. Little is known, however, about the factors determining the physiological response of woody plants to drought at landscape scales. Our objective was to
Tarin, Paz-Kagan, Gregory P, Asner
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