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Alexander Willberg [09-2012]:

Monitoring in Natura 2000-Gebieten unter Anwendung der spektralen Entmischung

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The Natura 2000 network of protection areas is of enormous importance in preserving the biodiversity. Important parts of this conception are the legal monitoring and the reporting requirements of the Flora-Fauna-Habitat Directive (FFH-92/43/EWG), which serve for a long-term recording of population dynamics and form the foundation of specific protection measures and management plans. This in turn, requires the provision of comprehensive valid information to describe the spatial-temporal trends in conservation areas. The collection of such information is the main focus of this thesis. The aim is to develop an effective and reproducible method for a permanent observation of protected areas. In this context, it will present a processing strategy for monitoring large-scale areas on the example of the Natura 2000 site „Kirchheller Heide and Hiesfelder Wald“. Based on the exemplary application, the population trends and changes should be registered. Finally, the thesis will evaluate the suitability and limitations of the presented strategy. The application is based on airborne hyperspectral remote sensing data from the years 2000 and 2003. The classification of the data is realized by using the Mixture tuned matched filtering (MTMF) unmixing model. The spectral unmixing results form the basis of change detection. For the analysis and evaluation of the population dynamics, the strategy of using biodiversity indicators from the research project EON2000+ is used. The results clearly indicate that the MTMF-technique is not a suitable method for the derivation of the used indicators. The method-specific properties of this classification technique are the cause for the limited suitability. Supplementary, the sensitivity of spectral variances proves particularly the unmixing of the pixel as a disadvantageous feature. Other disadvantages of this unmixing model arise from the complicated and tedious application, from an inadequate visualization of the results and because of a failed signature transfer to the multitemporal use of the collected endmember-signatures. In conclusion, the suitability of the used processing strategy cannot be detected.


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