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Global long-term passive microwave satellite-based retrievals of vegetation optical depth
2011
Geophysical Research Letters
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Introduction [2] Vegetation dynamics play an important role in the hydrological, energy and carbon cycles, through influences of land cover change on hydrologic responses, interactions with climate and ...
The VOD increases with vegetation density; over dense vegetation (e.g., tropical rainforest), the transmissivity gets close to zero and the microwave emissions are dominated by vegetation. [6] The VOD ...
doi:10.1029/2011gl048684
fatcat:xpmus7gzbrcatamp2xhvryuy4u
Land surface phenologies and seasonalities using cool earthlight in mid-latitude croplands
2013
Environmental Research Letters
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Vegetation optical depth (VOD), a microwave analog of a vegetation index, was modeled as a function of AGDD with the resulting fitted convex quadratic models yielding both high coefficients of determination ...
These results showed the potential of AMSR-E in monitoring and modeling cropland dynamics. ...
We gratefully acknowledge the thoughtful comments from two anonymous reviewers that increased the clarity of the presentation. ...
doi:10.1088/1748-9326/8/4/045002
fatcat:vgpbdkok4zcgflv7xyqahfxzuq
A Physically Constrained Inversion for Super-resolved Passive Microwave Retrieval of Soil Moisture and Vegetation Water Content in L-band
[article]
2018
arXiv
pre-print
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Unlike the existing algorithms, the presented approach can account for slowly varying dynamics of the vegetation water content over croplands through a temporal smoothing-norm regularization. ...
solution spaces that are characterized by the eigenspace of the model Hessian. ...
06/01/2016. dynamic constraints of vegetation transmissivity at resolution 1 to 5 km. ...
arXiv:1806.03298v2
fatcat:otl5fnjaijc3bf6gctx4da6wfm
III. Measuring surface soil moisture using passive microwave remote sensing
1993
Hydrological Processes
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vegetation, [ = transmissivity of the vegetation layer, 7, = physical temperature of the vegetation and T;o,, = physical temperature of the background. ...
Single Scattering Albedo (~0) [=Transmissivity of Vegetation Count +(@,,,-1 )exp(h) T,=Temperature of Vegetation (°K) T.on™ }emperature of Soil (T,. ...
doi:10.1002/hyp.3360070205
fatcat:73dqitt73vbcrene75j3akhsre
Simulating the influence of temperature on microwave transmissivity of trees during winter observed by spaceborne microwave radiometery
2020
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
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Forest transmissivity is a key parameter for understanding spaceborne and airborne observations of the Earth's land surface because not only does it influences the proportion of sub-canopy upwelling microwave ...
In frozen winter conditions, our previous study has indicated that observed microwave transmissivity of trees is also strongly influenced by temperature. ...
The ground measured radiometer data and ancillary data are provided by the FMI Arctic Research Centre, the GCOM-W1 AMSR2 level 1R Tb product is provided by JAXA, and MODIS MOD44b Version 6 Vegetation ...
doi:10.1109/jstars.2020.3017618
fatcat:5t7vxcintzfypad4vzettxnvme
Parameterization of the Land Parameter Retrieval Model for L-Band Observations Using the NAFE'05 Data Set
2009
IEEE Geoscience and Remote Sensing Letters
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However, care should be taken when using the proposed dynamic roughness model as it is based on a limited data set, and a more thorough evaluation is necessary to test the validity of this new approach ...
It was found that model convergence could only be achieved with a temporally dynamic roughness. The roughness was parameterized according to incidence angle and soil moisture. ...
While it excludes the complex parameterization of the vegetation, a dynamic roughness model had to be included. ...
doi:10.1109/lgrs.2009.2019607
fatcat:llsojunzbfbynneb7d73tnfqzy
A PRELIMINARY STUDY ON MECHANISM OF LAI INVERSION SATURATION
2012
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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In order to analyze the saturation phenomena in parameter inversion, we analyze the changing of canopy reflectance and backscattering with increasing of LAI through PROSAIL and MIMICS model respectively ...
Many parameters, such as albedo, vegetation index and leaf area index (LAI) inversed from satellite images, often get saturated when the surface vegetation cover reaches a certain high level. ...
Remote Sensing of Environment, 92(4), pp.447-464. [5] Gitelson, A. A., 2004. Wide dynamic range vegetation index for remote quantification of biophysical characteristics of vegetation. ...
doi:10.5194/isprsarchives-xxxix-b1-77-2012
fatcat:guzs242yvrfppntdzqo6ykbtiy
Mapping recharge from space: roadmap to meeting the grand challenge
2006
Hydrogeology Journal
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The approaches rely on microwave remote sensing in order to measure land surface states in the presence of atmosphere and vegetation cover that attenuate and disturb the signal as it travels from the surface ...
This hydrologic flux is intimately related to the distribution and functioning of vegetation cover and type. In turn, it also plays a significant role in the distribution of vegetation. ...
To penetrate vegetation, soil surface, and deep soil, lower-frequency microwaves are needed due to their ability to travel through significant vegetation canopies and through soil with a low attenuation ...
doi:10.1007/s10040-006-0120-6
fatcat:ckl4twb3gvg5tfnftdaamlj6na
Soil moisture estimates from TRMM Microwave Imager observations over the Southern United States
2003
Remote Sensing of Environment
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The algorithm for deriving soil moisture and temperature from TMI observations is based on a physical model of microwave emission from a layered soil -vegetation -atmosphere medium. ...
The most readily available observations from which a surface wetness state could be derived is the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) observations at 10.65 GHz. ...
Acknowledgements This work is supported by NASA Earth Science Enterprise Modeling and Data Analysis Research Program. ...
doi:10.1016/s0034-4257(03)00052-x
fatcat:qiefihdwg5bsle54vf6e5umsfu
Water resource monitoring systems and the role of satellite observations
2011
Hydrology and Earth System Sciences
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estimates of current (and past) water resources distribution. ...
1 We define "operational" here as producing information on a regular basis, and "spatial water resources monitoring systems" (SWRMS) as software that integrates observations into models to produce spatial ...
This work is part of the water information research and development alliance between the Bureau of Meteorology and CSIRO's Water for a Healthy Country Flagship. ...
doi:10.5194/hess-15-39-2011
fatcat:ism2x2mlefhqpjsw4yacwqm5pq
Water resource monitoring systems and the role of satellite observations
2010
Hydrology and Earth System Sciences Discussions
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estimates of current (and past) water resources distribution. ...
1 We define "operational" here as producing information on a regular basis, and "spatial water resources monitoring systems" (SWRMS) as software that integrates observations into models to produce spatial ...
This work is part of the water information research and development alliance between the Bureau of Meteorology and CSIRO's Water for a Healthy Country Flagship. ...
doi:10.5194/hessd-7-6305-2010
fatcat:gpnaxsp5mnd7pout3dpso72xsm
Microwave Vegetation Index from Multi-Angular Observations and Its Application in Vegetation Properties Retrieval: Theoretical Modelling
2019
Remote Sensing
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Monitoring global vegetation dynamics is of great importance for many environmental applications. ...
Validation with ground-based measurements proved this model is an efficient tool to describe the microwave emissions of corn and wheat. ...
We thank all the reviewers for their careful reading of the manuscript and their constructive remarks.
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/rs11060730
fatcat:yowkttemyncvdmauwabfs4wk2q
SMOSREX: A long term field campaign experiment for soil moisture and land surface processes remote sensing
2006
Remote Sensing of Environment
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Soil freezing is shown to be drastically different for bare soil and vegetation covered plots, with a large threshold effect on microwave surface emission. ...
Within the context of the preparation of SMOS activities over land, a field campaign, SMOSREX (Surface Monitoring Of the Soil Reservoir EXperiment), has been in operation since January 2001 in Mauzac, ...
The vegetation transmissivity γ is a critical variable which characterizes the vegetation effect on the microwave emission of the surface. ...
doi:10.1016/j.rse.2006.02.021
fatcat:y3x22gqet5eyzi25cf7vzstn2e
Using a Discrete Scattering Model to Constrain Water Cloud Model for Simulating Ground-Based Scatterometer Measurements and Retrieving Soil Moisture
2021
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
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transmissivity agree well with the seasonal vegetation dynamics; ii) the total scattering simulated by the TVG constrained WCMs shows a good consistency with the scatterometer measurements, and the simulated ...
It is found that: i) the calibrated Tor Vergata (hereafter "TVG") model simulates well the seasonal dynamics and magnitudes of scatterometer measurements, and the simulated scattering components and vegetation ...
For simulating the microwave backscatter from vegetation covered soil surfaces, soil scattering models are often coupled to vegetation scattering models. ...
doi:10.1109/jstars.2021.3111606
fatcat:v5d7wspivrholoqstselihrkba
Front Matter: Volume 9260
2014
Land Surface Remote Sensing II
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SPIEDigitalLibrary.org Paper Numbering: Proceedings of SPIE follow an e-First publication model, with papers published first online and then in print. ...
Utilization of CIDs allows articles to be fully citable as soon as they are published online, and connects the same identifier to all online, print, and electronic versions of the publication. ...
0P
Comparison between microwave coherent and incoherent scattering models for wetland
vegetation in Poyang Lake area [9260-25]
9260 0Q
Simulation of microwave brightness temperature over heterogeneous ...
doi:10.1117/12.2179079
fatcat:obc4dx7fr5egve4apiuzi7nxlm
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