Application of Proba-1/chris Data to Determine Degradation Indicators within the Semi-arid Wetland Area (national Park Las Tablas De Daimiel, Spain)

The National Park of Las Tablas de Daimiel in Central Spain is a wetland area of great value regarding biodiversity and wildlife habitat. This type of ecosystem is unique within a semi-arid climate and especially sensitive to degradation processes caused by growing pressure on natural resources (agricultural practices, groundwater depletion and land use change) as well as climatic changes. The objective of this work is to determine semi-arid wetland characteristics that are related to indicators of quality or degradation that represent the wetland state as a result of human-induced activities applying multi-angle Proba-1/CHRIS data. Data acquisitions were taken when the wetland area was under the influence of dry or wet conditions as a result of management practices intended to regulate the ecosystem habitat. The methodology is focused on obtaining wetland information related to wetland indicators (vegetation, water mass, soil and sediments). Endmembers are identified and a partial spectral unmixing is carried out applying a Mixture Tuned Matched Filtering. Results show that image-derived endmembers from the multi-angular Proba-1/CHRIS data identified a series of surface components, which are associated to the conditions and quality of the wetland area. These include important wetland indicators such as palustrine vegetation species (Pragmites australis and Cladium mariscus) and shallow water bodies. Fractional abundance maps were obtained for endmembers that were well represented within the wetland area. In this case, the identification and spatial distribution of Phragmites australis can be used as an indicator that is affecting the emblematic Cladium mariscus. * Corresponding author.