NDLI: Comparison of Two Bare-Soil Reflectivity Models and Validation With L-Band Radiometer Measurements

Content Provider	IEEE Xplore Digital Library
Author	Schwank, M. Volksch, I. Wigneron, J.-P. Kerr, Y.H. Mialon, A. de Rosnay, P. Matzler, C.
Copyright Year	1980
Abstract	The emission of bare soils at microwave L-band (1-2 GHz) frequencies is known to be correlated with surface soil moisture. Roughness plays an important role in determining soil emissivity although it is not clear which roughness length scales are most relevant. Small-scale (i.e., smaller than the resolution limit) inhomogeneities across the soil surface and with soil depth caused by both spatially varying soil properties and topographic features may affect soil emissivity. In this paper, roughness effects were investigated by comparing measured brightness temperatures of well-characterized bare soil surfaces with the results from two reflectivity models. The selected models are the air-to-soil transition model and Shi's parameterization of the integral equation model (IEM). The experimental data taken from the Surface Monitoring of the Soil Reservoir Experiment (SMOSREX) consist of surface profiles, soil permittivities and temperatures, and brightness temperatures at 1.4 GHz with horizontal and vertical polarizations. The types of correlation functions of the rough surfaces were investigated as required to evaluate Shi's parameterization of the IEM. The correlation functions were found to be clearly more exponential than Gaussian. Over the experimental period, the diurnal mean root mean square (rms) height decreased, while the correlation length and the type of correlation function did not change. Comparing the reflectivity models with respect to their sensitivities to the surface rms height and correlation length revealed distinct differences. Modeled reflectivities were tested against reflectivities derived from measured brightness, which showed that the two models perform differently depending on the polarization and the observation angle.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	325
Ending Page	337
Page Count	13
File Size	624603
File Format	PDF
ISSN	01962892
Volume Number	48
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity L-band Surface topography Rough surfaces Surface roughness Soil measurements Brightness temperature Polarization Microwave radiometry Frequency soil moisture Electromagnetic scattering by rough surfaces microwave radiometry permittivity
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

A Simple Model of the Bare Soil Microwave Emission at L-Band

A parameterized surface reflectivity model and estimation of bare-surface soil moisture with L-band radiometer

L-Band Reflectivity of a Furrowed Soil Surface

Calculations of the Microwave Brightness Temperature of Rough Soil Surfaces: Bare Field

Rough bare soil reflectivity model

Microwave L-band emission of freezing soil

A simple parameterization of the L-band microwave emission from rough agricultural soils

Utilization of Active Microwave Roughness Measurements to Improve Passive Microwave Soil Moisture Estimates Over Bare Soils

Parameter sensitivity of soil moisture retrievals from airborne L-band radiometer measurements in SMEX02

Comparison of Two Bare-Soil Reflectivity Models and Validation With L-Band Radiometer Measurements

Similar Documents

A Simple Model of the Bare Soil Microwave Emission at L-Band

A parameterized surface reflectivity model and estimation of bare-surface soil moisture with L-band radiometer

L-Band Reflectivity of a Furrowed Soil Surface

Calculations of the Microwave Brightness Temperature of Rough Soil Surfaces: Bare Field

Rough bare soil reflectivity model

Microwave L-band emission of freezing soil

A simple parameterization of the L-band microwave emission from rough agricultural soils

Utilization of Active Microwave Roughness Measurements to Improve Passive Microwave Soil Moisture Estimates Over Bare Soils

Parameter sensitivity of soil moisture retrievals from airborne L-band radiometer measurements in SMEX02

Comparison of Two Bare-Soil Reflectivity Models and Validation With L-Band Radiometer Measurements