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Monitoring of the Lac Bam Wetland Extent Using Dual-Polarized X-Band SAR Data

Moser, Linda and Schmitt, Andreas and Wendleder, Anna and Roth, Achim (2016) Monitoring of the Lac Bam Wetland Extent Using Dual-Polarized X-Band SAR Data. Remote Sensing, 8 (302), pp. 1-31. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs8040302 ISSN 2072-4292

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Official URL: http://www.mdpi.com/2072-4292/8/4/302/pdf

Abstract

Wetlands in semi-arid Africa are vital as water resource for local inhabitants and for biodiversity, but they are prone to strong seasonal fluctuations. Lac Bam is the largest natural freshwater lake in Burkina Faso, its water is mixed with patches of floating or flooded vegetation, and very turbid and sediment-rich. These characteristics as well as the usual cloud cover during the rainy season can limit the suitability of optical remote sensing data for monitoring purposes. This study demonstrates the applicability of weather-independent dual-polarimetric Synthetic Aperture Radar (SAR) data for the analysis of spatio-temporal wetland dynamics. A TerraSAR-X repeat-pass time series of dual-co-polarized HH-VV StripMap data—with intervals of 11 days, covering two years (2013–2015) from the rainy to the dry season—was processed to normalized Kennaugh elements and classified mono-temporally and multi-temporally. Land cover time series and seasonal duration maps were generated for the following four classes: open water, flooded/floating vegetation, irrigated cultivation, and land (non-wetland). The added value of dual-polarimetric SAR data is demonstrated by significantly higher multitemporal classification accuracies, where the overall accuracy (88.5%) exceeds the classification accuracy using single-polarimetric SAR intensity data (82.2%). For relevant change classes involving flooded vegetation and irrigated fields dual-polarimetric data (accuracies: 75%–97%) are favored to single-polarimetric data (42%–87%). This study contributes to a better understanding of the dynamics of semi-arid African wetlands in terms of water areas including water with flooded vegetation, and the location and timing of irrigated cultivations.

Item URL in elib:https://elib.dlr.de/104382/
Document Type:Article
Title:Monitoring of the Lac Bam Wetland Extent Using Dual-Polarized X-Band SAR Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Moser, LindaLinda.Moser (at) dlr.deUNSPECIFIED
Schmitt, AndreasAndreas.Schmitt (at) dlr.deUNSPECIFIED
Wendleder, AnnaAnna.Wendleder (at) dlr.deUNSPECIFIED
Roth, AchimAchim.Roth (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:8
DOI :10.3390/rs8040302
Page Range:pp. 1-31
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:Burkina Faso, Kennaugh decomposition, Lac Ban, Monitoring, Radar polarimetry, SAR, time series, wetlands
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 Fernerkundung der Landoberfläche (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Wendleder, Anna
Deposited On:31 May 2016 08:19
Last Modified:21 Sep 2019 05:05

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