Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data
Surface water is a critical resource in semiarid West-African regions that are frequently exposed to droughts. Natural and artificial wetlands are of high importance for different livelihoods, particularly during the dry season, from October/November until May. However, wetlands largely go unmonitor...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2014-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/6875901/ |
| _version_ | 1819092765615587328 |
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| author | Linda Moser Stefan Voigt Elisabeth Schoepfer Stephanie Palmer |
| author_facet | Linda Moser Stefan Voigt Elisabeth Schoepfer Stephanie Palmer |
| author_sort | Linda Moser |
| collection | DOAJ |
| description | Surface water is a critical resource in semiarid West-African regions that are frequently exposed to droughts. Natural and artificial wetlands are of high importance for different livelihoods, particularly during the dry season, from October/November until May. However, wetlands largely go unmonitored. In this work, remote sensing is used to monitor wetlands in semiarid Burkina Faso over large areal extents along a gradient of different rainfall and land use characteristics. Time series of data from the Moderate Resolution Imaging Spectrometer (MODIS) from 2000 to 2012 is used for near-infrared (NIR)-based water monitoring using a latitudinal threshold gradient approach. The occurrence of 21 new water bodies with a size larger than 0.5 km<sup>2</sup> over the 13-year analysis period results from a postclassification change detection. Yearly cumulative spatiotemporal analysis shows lower water extents in the drought seasons of 2000-2001, 2004-2005, and 2011-2012. Multiple wetlands indicate a positive trend toward a larger yearly maximum area, but a negative trend toward shorter flooding duration. Such a negative trend is observed particularly for natural wetlands. The temporal behavior of five selected case studies demonstrates that monthly negative anomalies of watercovered areas coincide with the occurrence of drought seasons. The successful application of remote sensing time series as a tool to monitor wetlands in semiarid regions is presented, and the potential of novel early warning indicators of drought from remote sensing is demonstrated. |
| first_indexed | 2024-12-21T23:00:49Z |
| format | Article |
| id | doaj.art-bf3eb7c6ce384b05a1634b4070d92682 |
| institution | Directory Open Access Journal |
| issn | 2151-1535 |
| language | English |
| last_indexed | 2024-12-21T23:00:49Z |
| publishDate | 2014-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj.art-bf3eb7c6ce384b05a1634b4070d926822022-12-21T18:47:18ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing2151-15352014-01-01783402341510.1109/JSTARS.2014.23368756875901Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite DataLinda Moser0Stefan Voigt1Elisabeth Schoepfer2Stephanie Palmer3German Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Wessling, GermanyGerman Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Wessling, GermanyGerman Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Wessling, Germany Balaton Limnological Institute, Hungarian Academy of Sciences Center for Ecological Research, Tihany, HungarySurface water is a critical resource in semiarid West-African regions that are frequently exposed to droughts. Natural and artificial wetlands are of high importance for different livelihoods, particularly during the dry season, from October/November until May. However, wetlands largely go unmonitored. In this work, remote sensing is used to monitor wetlands in semiarid Burkina Faso over large areal extents along a gradient of different rainfall and land use characteristics. Time series of data from the Moderate Resolution Imaging Spectrometer (MODIS) from 2000 to 2012 is used for near-infrared (NIR)-based water monitoring using a latitudinal threshold gradient approach. The occurrence of 21 new water bodies with a size larger than 0.5 km<sup>2</sup> over the 13-year analysis period results from a postclassification change detection. Yearly cumulative spatiotemporal analysis shows lower water extents in the drought seasons of 2000-2001, 2004-2005, and 2011-2012. Multiple wetlands indicate a positive trend toward a larger yearly maximum area, but a negative trend toward shorter flooding duration. Such a negative trend is observed particularly for natural wetlands. The temporal behavior of five selected case studies demonstrates that monthly negative anomalies of watercovered areas coincide with the occurrence of drought seasons. The successful application of remote sensing time series as a tool to monitor wetlands in semiarid regions is presented, and the potential of novel early warning indicators of drought from remote sensing is demonstrated.https://ieeexplore.ieee.org/document/6875901/Burkina Fasodrought indicatorsModerate Resolution Imaging Spectrometer (MODIS)monitoringSahelsurface water |
| spellingShingle | Linda Moser Stefan Voigt Elisabeth Schoepfer Stephanie Palmer Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Burkina Faso drought indicators Moderate Resolution Imaging Spectrometer (MODIS) monitoring Sahel surface water |
| title | Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data |
| title_full | Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data |
| title_fullStr | Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data |
| title_full_unstemmed | Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data |
| title_short | Multitemporal Wetland Monitoring in Sub-Saharan West-Africa Using Medium Resolution Optical Satellite Data |
| title_sort | multitemporal wetland monitoring in sub saharan west africa using medium resolution optical satellite data |
| topic | Burkina Faso drought indicators Moderate Resolution Imaging Spectrometer (MODIS) monitoring Sahel surface water |
| url | https://ieeexplore.ieee.org/document/6875901/ |
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