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

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

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

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/104382/
Dokumentart:Zeitschriftenbeitrag
Titel:Monitoring of the Lac Bam Wetland Extent Using Dual-Polarized X-Band SAR Data
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Moser, LindaLinda.Moser (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schmitt, AndreasAndreas.Schmitt (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wendleder, AnnaAnna.Wendleder (at) dlr.dehttps://orcid.org/0009-0005-1534-4732NICHT SPEZIFIZIERT
Roth, AchimAchim.Roth (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Erschienen in:Remote Sensing
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:8
DOI:10.3390/rs8040302
Seitenbereich:Seiten 1-31
Verlag:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:veröffentlicht
Stichwörter:Burkina Faso, Kennaugh decomposition, Lac Ban, Monitoring, Radar polarimetry, SAR, time series, wetlands
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Fernerkundung der Landoberfläche (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Landoberfläche
Hinterlegt von: Wendleder, Anna
Hinterlegt am:31 Mai 2016 08:19
Letzte Änderung:06 Nov 2023 09:00

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