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Analysis of ASAR and MERIS data for large scale water and vegetation monitoring in the Iullemeden aquifer, West African Sahel zone


Leiterer, Reik; Reiche, Johannes; Thiel, Christian; Schmullius, Christiane; Dodo, A K (2008). Analysis of ASAR and MERIS data for large scale water and vegetation monitoring in the Iullemeden aquifer, West African Sahel zone. In: 3rd International Conference on Managing Shared aquifer Resources in Africa , Tripoli (LY), 25 May 2008 - 27 May 2008, 186-193.

Abstract

This paper presents results achieved within the AQUIFER project and from applying a remote sensing approach for regional scale water and vegetation monitoring in the Sahel. This area is characterized by important interaction between climate variability and socio-economic key factors like agriculture and water resources. The present study is focussing on surface water and vegetation monitoring over the Iullemeden Aquifer System. The groundwater of the Iullemeden Aquifer System (IAS) is composed by two major aquifers: the cretaceous Continental Intercalaire and the tertiary and quaternary Continental Terminal. This Aquifer system is affected by progressive over-extraction, water quality degradation human induced pollution, associated with soil degradation, and the impacts of variability and climatic change. The specific vegetation and the open surface water bodies in these arid regions are good indicators for environmental change. In many parts of the Sahel there are no continuous ground truth measurements available to allow statements about the extension of vegetation and open water bodies. Earth Observation data may provide the only approach to detect and analyse long-term changes and it allows to monitor the negative impacts of human activities and climatic change of the available water resources in this area. This study demonstrates the performance and suitability of ENVISAT MERIS and ASAR-WS data for this purpose. Land cover classification maps of four different points in time within one growth period were generated using a rule based (object oriented) classification approach. Additionally, the changes between the four different dates as well as the seasonal vegetation dynamics were analysed.

This paper presents results achieved within the AQUIFER project and from applying a remote sensing approach for regional scale water and vegetation monitoring in the Sahel. This area is characterized by important interaction between climate variability and socio-economic key factors like agriculture and water resources. The present study is focussing on surface water and vegetation monitoring over the Iullemeden Aquifer System. The groundwater of the Iullemeden Aquifer System (IAS) is composed by two major aquifers: the cretaceous Continental Intercalaire and the tertiary and quaternary Continental Terminal. This Aquifer system is affected by progressive over-extraction, water quality degradation human induced pollution, associated with soil degradation, and the impacts of variability and climatic change. The specific vegetation and the open surface water bodies in these arid regions are good indicators for environmental change. In many parts of the Sahel there are no continuous ground truth measurements available to allow statements about the extension of vegetation and open water bodies. Earth Observation data may provide the only approach to detect and analyse long-term changes and it allows to monitor the negative impacts of human activities and climatic change of the available water resources in this area. This study demonstrates the performance and suitability of ENVISAT MERIS and ASAR-WS data for this purpose. Land cover classification maps of four different points in time within one growth period were generated using a rule based (object oriented) classification approach. Additionally, the changes between the four different dates as well as the seasonal vegetation dynamics were analysed.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Event End Date:27 May 2008
Deposited On:16 Apr 2013 08:33
Last Modified:05 Apr 2016 16:44
Publisher:UNESCO
Series Name:IHP-VII Series on Groundwater
Number:1
Official URL:http://unesdoc.unesco.org/images/0018/001884/188462m.pdf
Related URLs:http://www.unesco.org/new/en/natural-sciences/environment/water/ihp/
Permanent URL: https://doi.org/10.5167/uzh-77424

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