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select sampling sites with the condition of representing European biogeographic
regions (EEA, 2002). Selected SRRF-regions were (first biogeographic region,
followed by main land-cover class): Boreal Forest (borf), Central Atlantic
Mixed Agricultural Activities (catm), Continental Forest (conf), Continental
Heterogeneous Agricultural Areas (conh), Mediterranean Arable Land (meda),
Mountains Open Spaces (mnto), North Atlantic Arable Land (nata), North Atlantic
Pastures (natp), Nemoral Mixed Agricultural Activities (nemi), Pannonian Arable
Land (pana). Within the selected regions, three satellite images of 50
50 km
2
are
×
randomly selected using the official European grid system (Fig. 12.1).
50 km)
1
Fig. 12.1
Ten SRRF regions (Renetzeder et al., 2008) with three sampling sites (50
×
The satellite images (Image2000) cover most of the European countries. They
are provided by the Joint Research Centre (JRC;
http://image2000.jrc.it
/) and are
publicly available. They are the main source of information regarding landscape
structure. Segmentation of satellite images was performed with the software pack-
age eCognition (© Definiens Inc.) delivering pure structural information. In order
to fill this “empty” layer of structural information with a thematic one, Corine Land
Cover (CLC2000;
http://terrestrial.eionet.europa.eu/CLC2000
) was used. These
land-cover data have a minimum mappable unit of 25 ha and a minimum width
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