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Simultaneous Retrieval of Surface Roughness Parameters for Bare Soils from Combined Active-Passive Microwave SMAP Observations

Fluhrer, Anke and Jagdhuber, Thomas and Akbar, Ruzbeh and O'Neill, Peggy and Entekhabi, Dara (2020) Simultaneous Retrieval of Surface Roughness Parameters for Bare Soils from Combined Active-Passive Microwave SMAP Observations. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2020.3035204. ISSN 0196-2892.

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Official URL: https://ieeexplore.ieee.org/document/9269430


An active-passive microwave retrieval algorithm for simultaneous determination of soil surface roughness parameters (vertical RMS height (s) and horizontal correlation length (l)) is presented for bare soils. The algorithm is based on active-passive microwave covariation including the improved Integral Equation Method (I2EM) and is tested with global SMAP observations. Estimated retrieval results for s and l are overall consistent with values in the literature, indicating the validity of the proposed algorithm. Sensitivity analyses showed that the developed roughness retrieval algorithm is independent of permittivity for es > 10 [-]. Furthermore, the physical model basis of this approach (I2EM) allows application of different autocorrelation functions (ACF), such as Gaussian and exponential ACFs. Global roughness retrieval results confirm bare areas in deserts such as Sahara or Gobi. However, the type of ACF used within roughness parameter estimation is important. Retrieval results for the Gaussian ACF describe a rougher surface than retrieval results for the exponential ACF. No correlations were found between roughness results and the amount of precipitation or the soil texture, which could be due to the coarse spatial resolution of the SMAP data. The extension of this approach to vegetated soils is planned as an add-on study.

Item URL in elib:https://elib.dlr.de/137417/
Document Type:Article
Title:Simultaneous Retrieval of Surface Roughness Parameters for Bare Soils from Combined Active-Passive Microwave SMAP Observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Fluhrer, AnkeUNSPECIFIEDhttps://orcid.org/0000-0002-1188-5313UNSPECIFIED
Jagdhuber, ThomasUNSPECIFIEDhttps://orcid.org/0000-0002-1760-2425UNSPECIFIED
Date:24 November 2020
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:correlation length, I2EM, radar, radiometer, RMS height, SMAP
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Remote Sensing and Geo Research
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Fluhrer, Anke
Deposited On:13 Nov 2020 07:50
Last Modified:06 Dec 2020 12:20

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