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        <gco:CharacterString>Calculation of the effective mesh size meff is based on two main datasets: 1) the Fragmentation Geometry (FG) (i.e., the set of all elements defining the fragmentation pattern) and 2) reporting units (spatial units for which meff is calculated). The reporting units layer (in this case a regular 1km2 grid) and the Fragmentation Geometry layer are overlaid and the Meff is calculated for each reporting unit.

The Copernicus High Resolution Layer - Imperviousness degree (30% of IMD) is the source layer for the build-up area. The Open Street Map (OSM) database is the source of the transport infrastructure. Only the following OSM elements are included in the calculation of the meff index: motorways and motorways links, trunk and trunk links, primary roads and primary roads links, secondary roads and secondary roads links, tertiary roads and tertiary roads links, railroads. Tunnels are excluded from the dataset.
The mapping computation steps are:
1) selection of build-up areas from the Copernicus High Resolution Imperviousness Degree layer
2) selection of transport routes relevant to the fragmentation geometry
3) deleting of tunnels from the transport routes
4) creating of buffers around the transport routes. A buffer size is dependent on the route class
6) erasing of build-up areas and the buffered transport routes from the seamless EEA39 territory layer
7) computation of meff values for each 1km sq reporting unit

References:
Jaeger, J. A.G.(2000): Landscape division, splitting index, and effective mesh size: New measures of landscape fragmentation. Landscape ecology 15(2), pp 115-130, http://link.springer.com/article/10.1023/A%3A1008129329289</gco:CharacterString>
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