Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data

Moser, Linda; Voigt, Stefan; Schöepfer, Elisabeth; Palmer, Stephanie C.

doi:10.1109/jstars.2014.2336875

Cited by 23 publications

(20 citation statements)

References 27 publications

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“…Lac Bam, located in central-north Burkina Faso (13.40N, 1.52W) just 300 m above sea level is the largest natural lake in Burkina Faso (Figure 1), with an area of 22-25 km 2 at high water level [3,52]. It is a permanent freshwater lake located along the Nakambé River (White Volta).…”

Section: Study Area-lac Bammentioning

confidence: 99%

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

et al. 2016

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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)(2014)(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.

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Section: Study Area-lac Bammentioning

confidence: 99%

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

et al. 2016

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“…Medium to low spatial resolution remote sensing data (250 m -4 km pixel size) enable the detection of trends and anomalies of remotesensing derived indices or biophysical variables over large areas. Applications in the Sahel include studies on the dynamics of vegetation, land use, and land degradation (Dardel et al, 2014;Brandt et al, 2014a;Horion et al, 2014;Mbow et al, 2015), water bodies and wetlands (Moser et al, 2014) and precipitation (Nicholson, 2005). Yet, such data is insufficient to elucidate more specific social-land use practices (Turner, 2003), for which the use of high to very high spatial resolution data is required (Elmqvist and Khatir, 2007;Brandt et al, 2014b).…”

Section: Using Geospatial Analysis In a Contested Landscapementioning

confidence: 99%

The production of contested landscapes: Enclosing the pastoral commons in Niger

Snorek

Moser

Renaud

2017

Journal of Rural Studies

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a b s t r a c tDivergent adaptation to climate variability produces unequal adaptive capacities between user groups and contributes to a contested landscape. This article examines divergent adaptations in the context of land tenure shifts in the pastoral zone of Niger. The management of the pastoral commons is shifting from a commonly-shared to private regime as former pastoralists take up new livelihoods, such as irrigated gardening. A method combining political ecology and remote sensing is used to study social ecological system (SES) dynamics in order to demonstrate the relationship between divergent adaptation, water-based conflict, land tenure shifts and land use/land cover change. Examining pastoral and agro-pastoral users' historical perceptions of land use and tenure change, results indicate that disputes over the access to and use of commonly shared natural resources are linked to increasing enclosures of ephemeral and permanent lakes in the pastoral zone of Niger. Remote sensing-derived information is used to identify and quantify the area and volume of enclosures around commonly shared water sources in the northern pastoral zone of Niger from 2003 to 2013. The study identifies the government-supported development of irrigated gardens in the pastoral zone as a divergent adaptation with its related conflict dynamics between user groups and highlights the land tenure shifts from a commonly to a privately managed regime. The findings have broader implications for the wider Sahel and provide recommendations as to how adaptation programs could be better designed and implemented in the pastoral system.

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“…Lac Bam is only monitored in terms of water level at the dam in the South, but no area-wide water monitoring has been carried out to date, considering open water as well as waters including flooded or floating vegetation. Moser et al (2014) used Lac Bam as one case study to monitor open water areas using optical medium resolution time series from MODIS. This work builds on the study recently published by Moser et al (2016) which is the first attempt for an area-wide monitoring applied at Lac Bam.…”

Section: Area Of Interestmentioning

confidence: 99%

Automated Wetland Delineation From Multi-Frequency and Multi-Polarized Sar Images in High Temporal and Spatial Resolution

Moser¹,

Schmitt²,

Wendleder³

2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Water scarcity is one of the main challenges posed by the changing climate. Especially in semi-arid regions where water reservoirs are filled during the very short rainy season, but have to store enough water for the extremely long dry season, the intelligent handling of water resources is vital. This study focusses on Lac Bam in Burkina Faso, which is the largest natural lake of the country and of high importance for the local inhabitants for irrigated farming, animal watering, and extraction of water for drinking and sanitation. With respect to the competition for water resources an independent area-wide monitoring system is essential for the acceptance of any decision maker. The following contribution introduces a weather and illumination independent monitoring system for the automated wetland delineation with a high temporal (about two weeks) and a high spatial sampling (about five meters). The similarities of the multispectral and multi-polarized SAR acquisitions by RADARSAT-2 and TerraSAR-X are studied as well as the differences. The results indicate that even basic approaches without pre-classification time series analysis or post-classification filtering are already enough to establish a monitoring system of prime importance for a whole region.

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Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data

Cited by 23 publications

References 27 publications

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

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

The production of contested landscapes: Enclosing the pastoral commons in Niger

Automated Wetland Delineation From Multi-Frequency and Multi-Polarized Sar Images in High Temporal and Spatial Resolution

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