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Polarimetric and interferometric methods to determine snow depth, SWE, and the depth of fresh snow

Leinss, Silvan and Wiesmann, Andreas and Lemmetyinen, Juha and Parrella, Giuseppe and Hajnsek, Irena (2015) Polarimetric and interferometric methods to determine snow depth, SWE, and the depth of fresh snow. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. Polarimetric and Interferometric SAR Workshop (PI-SAR), 2015-01-26 - 2015-01-30, Frascati, Italy.

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Abstract

Microwaves interact with snow on a wide variety of effects. The specific effect of interaction depends mainly on liquid water content which determines the penetration depth. The penetration depth changes by orders of magnitude at the transition from dry snow to wet snow. Further affects appear due to roughness of the boundary layers soil-snow and snow-air and discontinuities in the snow pack. Even the microstructural anisotropy of snow affects the interaction with microwaves. Therefore, complementary methods have to be applied to access the medium snow in all it's facets. Here, I will demonstrate different polarimetric and interferometric methods, which show a sensitivity to certain properties of snow. Surface-sensitive methods apply only for wet snow, due to the very limited penetration depth, especially at high frequencies. I will demonstrate, that the height difference of two single-pass interferograms taken by TanDEM-X is equivalent to the height of accumulated snow within one winter season. In contrast to wet snow, I will demonstrate, that it is possible to derive the total snow water equivalent (SWE) of dry snow from a time series of differential interferograms. Going beyond height or SWE sensitive methods, I will demonstrate a polarimetric method, which is sensitive to the microstructure of snow. A simple model will be presented, which shows that the phase delay of the HH vs. the VV polarization is sensitive to the amount of fresh snow and to the temperature-gradient driven metamorphism of snow.

Item URL in elib:https://elib.dlr.de/93606/
Document Type:Conference or Workshop Item (Speech)
Title:Polarimetric and interferometric methods to determine snow depth, SWE, and the depth of fresh snow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Leinss, SilvanETH ZurichUNSPECIFIED
Wiesmann, AndreasGamma Remote SensingUNSPECIFIED
Lemmetyinen, JuhaFMI, FUNSPECIFIED
Parrella, GiuseppeUNSPECIFIEDUNSPECIFIED
Hajnsek, IrenaUNSPECIFIEDUNSPECIFIED
Date:January 2015
Journal or Publication Title:Proceedings of ESA POLinSAR Workshop
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Lacoste-Francis, H.esapub@esa.int
Publisher:ESA Communications
Status:Published
Keywords:SAR polarimetry, SAR interferometry, snow properties, polarization phase difference, snow structure
Event Title:Polarimetric and Interferometric SAR Workshop (PI-SAR)
Event Location:Frascati, Italy
Event Type:international Conference, Workshop
Event Dates:2015-01-26 - 2015-01-30
Organizer:ESA-ESRIN
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 Multi-dimensionale SAR-Auswertung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Parrella, Dr. sc. Giuseppe
Deposited On:15 Dec 2014 08:06
Last Modified:20 Jan 2016 09:48

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