Current use of spatial reference grids in European Environment Agency Andrus Meiner, EEA
Direct and indirect spatial reference (position) Source: http://crs Direct and indirect spatial reference (position) Source: http://crs.ifag.de/crs_content.php (Bundesamt für Kartographie und Geodäsie)
Environmental issues and use of reference grids (1) Air pollution, ozone and UV emissions deposition concentrations exposure calculated critical loads, exceedances Biodiversity assessment species distribution (atlases)
Environmental issues and use of reference grids (2) Climate change and hydrology temperature change average annual runoff Land cover land cover distribution fragmentation Soil erosion risk
Current use of reference grids Number of maps in 3 latest EEA main assessment reports EMEP grids: 50 km and 150 km, /17 maps air pollution modelling, deposition UTM 50 km, 5 maps species distribution mapping (atlases) Equal area 10 km grids, /10 maps supports geographical comparisons based on area land cover, river basin management Lat / Long cells: 30’ x 30’, also others /8 maps various uses: deposition of hazardous substances, erosion risk, mean temperature, seismicity regular sampling grids (ICP Forest 16 km grid) /2 maps
EMEP grid Monitoring for CLRTAP Projection: Polar Stereographic Resolution Original 50 x 50 km (on project plane) Derived 150 x 150 km and 1˚x 1˚ Cell area on earth vary 1750 – 2850 km2 Conversion to geographical (lat/long) coordinates supported
EMEP 50 x 50 km grid
EMEP 50 km grid: reprojected EEA version
Example of EMEP 50 km grid: ecosystems protected against acidification
Example of EMEP 150 km grid: HCB concentration in soil
UTM grid by CGRS/AFE Chorological Grid Reference System/Atlas Florae Europaeae Widely used in species distribution mapping Spatial reference system: UTM (and UPS) WGS84 datum grid is based on Military Grid Reference System Resolution standard 50 x 50 km irregular cell size on the UTM zone boundaries
UTM 50 x 50 km grid
New AFE Grid cell locations Source: http://www. fmnh. helsinki
Example of UTM 50 grid
Other grids 10 km equal area grid Lat/long grids Lambert Azimuthal Equal Area projection and WGS84 Centerpoint 52˚N 20˚E Used in land cover mapping and analysis Lat/long grids Different resolution (30’ x 30’ etc) Variety of applications
Example of 10 km grid: CORINE Land Cover
Example of 10 km grid
Example of lat/long grid cells
Example of lat/long grid (water erosion vulnerability 1990, IMAGE 2 by RIVM)
Conclusions EEA is not a grid developer, but is interested in European common grid EEA priorities : Compatibility through clear relation to ETRS89 use WGS84 datum agreed projections LAEA, TMzn and LCC Convertability to geographical lat/long coordinates Efficiency for data storage and access, like quadtree hierarchical data structure