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Simultaenous Retrieval of Surface Roughness Parameters from Combined Active-Passive SMAP Observations

Fluhrer, Anke and Jagdhuber, Thomas and Akbar, Ruzbeh and O'Neill, Peggy and Entekhabi, Dara (2019) Simultaenous Retrieval of Surface Roughness Parameters from Combined Active-Passive SMAP Observations. In: International Geoscience and Remote Sensing Symposium (IGARSS). IGARSS 2019, 28. Jul. - 02. Aug. 2019, Yokohama, Japan. (In Press)

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Abstract

Soil roughness strongly influences processes like erosion, infiltration, moisture and evaporation of soils as well as growth of agricultural plants. An approach to soil roughness based on active-passive microwave covariation is proposed in order to simultaneously retrieve the vertical RMS height (s) and horizontal correlation length (l) of soil surfaces from simultaneously measured radar and radiometer microwave signatures. The approach is based on a retrieval algorithm for active-passive covariation including the improved Integral Equation Method (I2EM). The algorithm is tested with the global active-passive microwave observations of the SMAP mission. The developed roughness retrieval algorithm shows independence of permittivity for e_s > 10 [-] due to the covariation formalism. Results reveal that s and l can be estimated simultaneously by the proposed approach since surface patterns of non-vegetated areas become evident on global scale. In regions with sandy deserts, like the Sahara or the outback in Australia, determined s and l confirm rather smooth to semi-rough surface roughness patterns with small vertical RMS heights and corresponding higher horizontal correlation lengths.

Item URL in elib:https://elib.dlr.de/125960/
Document Type:Conference or Workshop Item (Speech)
Title:Simultaenous Retrieval of Surface Roughness Parameters from Combined Active-Passive SMAP Observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fluhrer, AnkeAnke.Fluhrer (at) dlr.dehttps://orcid.org/0000-0002-1188-5313
Jagdhuber, ThomasThomas.Jagdhuber (at) dlr.dehttps://orcid.org/0000-0002-1760-2425
Akbar, RuzbehMITUNSPECIFIED
O'Neill, PeggyNASA GoddardUNSPECIFIED
Entekhabi, DaraMITUNSPECIFIED
Date:2019
Journal or Publication Title:International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:In Press
Keywords:radar, radiometer, RMS height, correlation length, covariation, I2EM
Event Title:IGARSS 2019
Event Location:Yokohama, Japan
Event Type:international Conference
Event Dates:28. Jul. - 02. Aug. 2019
Organizer:IEEE Geoscience and Remote Sensing Society Organizing Committee
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Sicherheitsrelevante Erdbeobachtung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Reconnaissance and Security
Deposited By: Fluhrer, Anke
Deposited On:15 Jan 2019 17:45
Last Modified:11 Nov 2019 14:24

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