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Elevation change of Bhasan Char measured by persistent scatterer interferometry using Sentinel-1 data in a humanitarian context

Braun, Andreas and Höser, Thorsten and Delgado, José Manuel (2020) Elevation change of Bhasan Char measured by persistent scatterer interferometry using Sentinel-1 data in a humanitarian context. European Journal of Remote Sensing, pp. 1-18. Taylor & Francis. DOI: 10.1080/22797254.2020.1789507 ISSN 2279-7254

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Official URL: https://www.tandfonline.com/doi/full/10.1080/22797254.2020.1789507

Abstract

This study investigates the elevation changes for the island of Bhasan Char, located in the Bay of Bengal, which was selected for the relocation of around 100,000 refugees of the Rohingya minority which were forced to leave their homes in Myanmar. Eighty-nine Sentinel-1 products were analysed using persistent scatterer interferometry (PSI) beginning August 2016 through September 2019, divided into three periods of one year to reduce the impact of temporal decorrelation. The findings indicate that the island is a recent landform which underlies naturally induced surface changes with velocities of up to ±20 mm per year. Additional displacement is probably caused by heavy construction loads since early 2018, although we found no statistical evidence for this. The main built-up area shows stable behaviour during the analysed period, but there are significant changes along the coasts and artificial embankments of the island, and within one separate settlement in the north. The moist surface conditions and strong monsoonal rains complicated the proper retrieval of stable trends, but the sum of findings supports the assumption that the island underlies strong morphologic dynamics which put the people to be relocated at additional risk. Its suitability for construction has to be investigated in further studies.

Item URL in elib:https://elib.dlr.de/135470/
Document Type:Article
Title:Elevation change of Bhasan Char measured by persistent scatterer interferometry using Sentinel-1 data in a humanitarian context
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Braun, AndreasUNSPECIFIEDhttps://orcid.org/0000-0001-8630-1389
Höser, ThorstenUNSPECIFIEDhttps://orcid.org/0000-0002-7179-3664
Delgado, José ManuelUNSPECIFIEDhttps://orcid.org/0000-0003-0098-3046
Date:6 July 2020
Journal or Publication Title:European Journal of Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1080/22797254.2020.1789507
Page Range:pp. 1-18
Publisher:Taylor & Francis
ISSN:2279-7254
Status:Published
Keywords:Persistent scatterer interferometry, radar remote sensing, humanitarian aid, time-series analysis, surface displacement, stamps, Sentinel-1, PS InSAR
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 - Remote sensing and geoscience
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface Dynamics
Deposited By: Höser, Thorsten
Deposited On:21 Jul 2020 11:07
Last Modified:21 Jul 2020 11:07

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