---------------------------------------------------------- Data Annex to the Landscape fragmentation in Europe Report ---------------------------------------------------------- This directory contains the landscape fragmentation data calculated for the EEA reference grid in 1 km resolution, both in tabular format (fsta2009_grid.txt) and in GeoTIFF format (FGA1_M.tif, FGA1_S.tif, FGA2_M.tif, FGA2_S.tif, FGB2_M.tif and FGB2_S.tif). For more information about the Landscape fragmentation report, see [1]. 1. Source data a) antrophogenic fragmenting elements TeleAtlas rel. 4/2009 (TA) database as source of road/rail network data. CLC2006 and CLC2000 databases as source of urban areas for calculations. b) natural fragmenting elements UNEP-WCMC and Wordclim data for defining mountain areas/mountain ridges. Catchment Characterisation and Modelling (CCM) database, ver 2, 2008 for main rivers. CLC2006 and CLC2000 databases as source of estuaries, intertidal flats, water courses, water bodies, coastal lagoons, complementing CCM. Buffers around TA communications have been created for calculations. The buffer size depends on the road/rail class: TA class description buffer size used 00...........motorway,freeway, other major road.................15 m 01...........major road less important than motorway............10 m 02...........other mafor road....................................7.5 m 03...........secondary road......................................5 m 04...........local connecting road...............................2.5 m railroad.....railroads...........................................2 m 2. Computations a) Fragmentation levels Three levels of fragmentation have been computed: FG-A1 - TA classes 00, 01, 02, railroads and urban areas used as fragmenting elements FG-A2 - TA classes 00, 01, 02, 03, 04, railroads and urban areas used as fragmenting elements FG-B2 - TA classes 00, 01, 02, 03, 04, railroads and urban areas used as fragmenting elements and natural fragmenting elements The Effective Mesh Size (Meff) is calculated according the cross-boundary connection (CBC) procedure, which accounts for connected unfragmented areas that extend beyond the boundaries of a given grid cell that the effective mesh size is being calculated for. The Effective Mesh Density (Seff) value is calculated as 1000/Meff. Further details of the Meff and Seff values are discussed below. b) Numeric values For FG-A1 and FG-A2: Meff values are positive real numbers including 0 for grid cells completely covered by urban and infrastructure, i.e. absolute fragmentation. The threshold for Meff values is 0.000001, smaller values are rounded to either 0.000001 or 0 (absolute fragmentation). Seff values are positive real numbers. If Meff = 0.000001, then Seff = 1 000 000 000. For grid cells completely covered by urban and infrastructure (Meff = 0), the Seff value is -2 (i.e. -2 represents positive infinity). Additional for FG-B2: Meff and Seff values can have a value of -1 for grid cells fully covered by natural elements. Meff and Seff values are not calculated for these cells, as there is (according to the definition) no area to be calculated for. 3. Data files a) FSTA2009_grid.txt A text file with all fragmentation values per 1x1 km grid cell. The field delimiter is the tab character (U+0009), records end with the line feed character (U+000A). FSTA2009_grid.txt contains these fields: name description ------------------------------------------------------------------------ CELLCODE LEAC grid cell code - unique identifier FGA1_M effective mesh size (Meff) for fragmentation geometry FG-A1 [km2] FGA1_S effective mesh density (Seff) for fragmentation geometry FG-A1 [meshes per 1000 km2] FGA2_M effective mesh size (Meff) for fragmentation geometry FG-A2 [km2] FGA2_S effective mesh density (Seff) for fragmentation geometry FG-A2 [meshes per 1000 km2] FGB2_M effective mesh size (Meff) for fragmentation geometry FG-B2 [km2] FGB2_S effective mesh density (Seff) for fragmentation geometry FG-A2 [meshes per 1000 km2] CELLCODE is a string value, all other fields have numeric values with a precision of 6 decimal places. b) GeoTIFFs 6 GeoTIFFs have been created from the fragmentation values in FSTA2009_grid.txt. Field names have been used as file names for the GeoTIFFs, which have been generated as Float32 layers. The spatial reference system for all GeoTIFFs is the ETRS89-LAEA projection, following the definitions of the EEA reference grid. This projection is widely known under the identifier EPSG:3035. For more information about the EEA reference grid, see [2]. 4. References [1] http://www.eea.europa.eu/publications/landscape-fragmentation-in-europe [2] http://www.eea.europa.eu/data-and-maps/data/eea-reference-grids-1