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Impact of Plant Surface Moisture on Differential Interferometric Observables: A Controlled Electromagnetic Experiment

Brancato, Virginia and Liebisch, Frank and Hajnsek, Irena (2017) Impact of Plant Surface Moisture on Differential Interferometric Observables: A Controlled Electromagnetic Experiment. IEEE Transactions on Geoscience and Remote Sensing, 55 (7), 3949 - 3964. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2017.2684814. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/document/7900343


The estimation of soil moisture and crop biomass based on differential interferometry is questioned by the influence of intercepted rain (i.e., plant surface moisture) on repeat-pass observables. The magnitude, the origin of this effect, as well as its dependence on system and crop biophysical parameters have been only marginally addressed so far. This paper intends to investigate these aspects within the frame of a laboratory experiment carried out in a highly controlled electromagnetic environment. The collection of multifrequency and fully polarimetric scatterometer profiles offers a distinctive data set, which helps to understand the variations of the interferometric observables in response to a varying plant surface moisture. These changes are assessed by comparing the predictions of a first-order scattering solution with the impact found in the experimental data. Furthermore, the connection between plant surface moisture and differential interferometric observables (i.e., the magnitude and phase of the interferometric coherence) is empirically tested with the aid of regression techniques. Irrespective of frequency and polarization, intercepted water is found to impact the interferometric coherence in a similar way as changes in soil and/or plant water status, i.e., the increase of the sensor to target optical path. Changes of plant surface moisture might be erroneously mistaken either for soil water content or fresh biomass variations. Therefore, this paper raises the possibility that, in certain circumstances, intercepted water might represent a potential source of bias for the estimation of these two land surface parameters.

Item URL in elib:https://elib.dlr.de/114015/
Document Type:Article
Title:Impact of Plant Surface Moisture on Differential Interferometric Observables: A Controlled Electromagnetic Experiment
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Brancato, Virginiaeth zurichUNSPECIFIEDUNSPECIFIED
Date:July 2017
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
Page Range:3949 - 3964
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Series Name:IEEE Transactions on Geoscience and Remote Sensing
Keywords:Moisture, Optical interferometry, Vegetation mapping, Agriculture, Land surface, Coherence
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 - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:13 Sep 2017 13:11
Last Modified:23 Jul 2022 13:44

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