Ruedi Haller

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The European Alps harbour a unique and species-rich biodiversity, which is increasingly impacted by habitat fragmentation through land-use changes, urbanization and expanding transport infrastructure. In this study, we identified the 50 most important questions relating to the maintenance and restoration of an ecological continuum - the connectedness of(More)
  • Eduardo Dias, Christophe Rhin, Ruedi Haller, Henk Scholten, Geodan B V
  • 2004
This article reports the WebPark implementation experience. WebPark is a location-based system used by visitors and administrators of protected areas. The system allows for visitors to get information and answer their questions in the field, using handheld computers. The system was developed in the framework of a R&D project funded by the EC (IST(More)
Protected areas provide unique opportunities to investigate species interactions under natural conditions. In the absence of large predators, ungulates have reached relatively high densities in the Swiss National Park, and in some valleys, chamois, alpine ibex and red deer co-occur in close proximity. We explored the potential for resource competition(More)
This paper presents a method to assess the horizontal accuracy of class boundary location for large scale categorical data for large mountainous and protected areas. The test was performed on a land cover dataset which was created for the Swiss National Park (SNP) with an overall area of 370 km2. The average area of a polygon has been 0.66 ha with a minimal(More)
Original field research data requires information about the positional accuracy of objects located in the field, expecially when analysed in the context of GIS. We present the results of a case study assessing the spatial accuracy of vegetation sampling data. The positional accuracy of a research grid consisting of adjacent squares of 20mx20m set up using a(More)
Endogeneity and reactivity have long been considered polar opposites of a major dimension of depression. The present factor analytic study examines 35 distinct depressive symptoms in three depressed samples and supports the conceptualization of D. F. Klein (Endomorphic depression. Arch. Gen. Psychiatry, 31:447-454, 1974) that endogeneity and reactivity can(More)
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