The operational and practical use of the WOIS to support IWRM in Africa is demonstrated via a series of user specific demonstration cases. The demonstration cases have several elements: First, customized end-to-end processing workflows are developed for the requested product group(s). The developed workflow is subsequently used for product derivation over significant areas and time periods as requested by the users, and in a final step the workflow (i.e. stability/performance and ease of use) as well as the product outcome is being evaluated in close dialogue with the users.
The demonstration projects being defined, produced and evaluated together with the initial user group are as follows:
- Historic and operational information on water quality and water surface temperature for Lake Chad and Lake Victoria using a combination of ENVISAT and MODIS data.
- Assessment of land degradation and desertification processes for Volta and Lake Chad basin from trend analysis of SPOT VGT NDVI time-series data and corresponding rainfall data
- Full basin mapping of the state and change in land cover/ land use from annual time-series of MERIS FR and MODIS data
- Landscape seasonal monitoring using decadal vegetation anomalies as derived from time series of biophysical SPOT VGT products i.e. Fraction of Absorbed Photosynthetically Active Radiation (FAPAR).
- High resolution land cover and land cover change mapping for water management related land cover classes in South Africa and land cover change mapping for the retreat area of Lake Chad based on SPOT, RapidEye and Landsat data.
- Detailed mapping and monitoring of open small water bodies and their seasonal changes in the northern part of the Volta basin based on SPOT, RapidEye and Landsat data.
- A flood mapping system consisting of two products: the historical flood mapping product for the Komadougou Yobe sub basin in the Lake Chad catchment, the Lake Tana region and the Gambella region based on Envisat ASAR data and the dynamic flood mapping product for the Zambezi Flood Plains in Caprivi in Namibia, the Eastern Nile and Lake Tana and the Gambella region based on Radarsat-2 and RapidEye tasking.
- Hydrological modelling using the semi distributed, physically based hydrological simulation software SWAT for River Chari and Logone basins in Lake Chad; Operational river discharge forecasting for Kavango basin and Mokolo catchment (South Africa).
- Mapping and modelling tool to estimate the water demand for water supply and sanitation associated with urban environments in Africa based on very high resolution satellite imagery land cover data and census data for N’Djamena, Chad.
- Mapping and monitoring of historic long term (2 wet seasons in time) and seasonal extent and variation of major wetland areas (Sudd, Baro-Akobo-Sobat and Kagera wetlands) in order to better understand and quantify the water balance of wetlands.
- Modelling of medium resolution, anthropogenic caused erosion potential for the Lake Victoria catchment and Kagera area in the Nile Basin based on land cover, rainfall, soil data as well as on a digital elevation model for the slope to identify highly potential erosion areas and changes for prioritizing watershed restoration activities and planning.
Please refer to the TIGER-NET Portal, for more information about the user cases and links to sample data or the software.
