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De Zan, Francesco and Gomba, Giorgio (2018) Vegetation and soil moisture inversion from SAR closure phases: First experiments and results. Remote Sensing of Environment, 217, pp. 562-572. Elsevier. doi: 10.1016/j.rse.2018.08.034. ISSN 0034-4257.
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Official URL: https://doi.org/10.1016/j.rse.2018.08.034
Abstract
The inversion of soil moisture from Synthetic Aperture Radar (SAR) closure phases is intrinsically plagued by ambiguities that affect the moisture order. This work shows a characterization of the ambiguities and a way to solve for them with the help of interferometric coherence. This allows to properly constrain the inversion and to retrieve the moisture signal. A data set of ALOS-2/PALSAR-2 L-band images is used as an example of successful inversion at the scene level, with sub-kilometer resolution. The results are validated with soil moisture products based on ASCAT and show a high degree of correlation. The raw moisture derived by the algorithm could be immediately used to correct SAR interferometric phases; however, for pplications that need absolute moisture levels, a calibration step is likely necessary. Unexpectedly, a good performance was observed over forested areas, which suggests a sensitivity of closure phases to tree moisture; at the same time, over pastures and agricultural fields the closure phase signal was found relatively weak. Additional research is needed to evaluate the ap- plicability of the same measurements principle to shorter wavelengths and exploitation of potential synergies with backscatter and polarimetric information.
| Item URL in elib: | https://elib.dlr.de/121676/ | |||||||||
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| Document Type: | Article | |||||||||
| Title: | Vegetation and soil moisture inversion from SAR closure phases: First experiments and results | |||||||||
| Authors: |
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| Date: | November 2018 | |||||||||
| Journal or Publication Title: | Remote Sensing of Environment | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | Yes | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | Yes | |||||||||
| In ISI Web of Science: | Yes | |||||||||
| Volume: | 217 | |||||||||
| DOI : | 10.1016/j.rse.2018.08.034 | |||||||||
| Page Range: | pp. 562-572 | |||||||||
| Publisher: | Elsevier | |||||||||
| ISSN: | 0034-4257 | |||||||||
| Status: | Published | |||||||||
| Keywords: | Soil moisture, Closure phase, SAR interferometry | |||||||||
| 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 - Vorhaben Tandem-L Vorstudien (old) | |||||||||
| Location: | Oberpfaffenhofen | |||||||||
| Institutes and Institutions: | Remote Sensing Technology Institute > SAR Signal Processing | |||||||||
| Deposited By: | De Zan, Francesco | |||||||||
| Deposited On: | 14 Sep 2018 10:29 | |||||||||
| Last Modified: | 31 Jul 2019 20:19 |
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