# The EMEP grid

Since 2017, EMEP uses a 0.1º x 0.1º longitude-latitude grid as described by CEIP at EMEP 0.1º x 0.1º gridded emissions and longitude-latitude definition of grid cells and fraction of grid cells per countryThe detailed description of the different emep grids can be found here.

## Additional material

- Map of the EMEP longitude-latitude grid used from 2017 (pdf format)
- Mapping of 0.1° x 0.1° grid-cell to countries (NetCDF-format)
- Map of the extended 50 km grid used from 2008 (eps format)
- Map of the 50 km grid used between 1997 and 2008 (pdf format)
- Map of the 150 km grid used between 1984 and 1997
- Fortran library for EMEP grid interpolation and coordinate conversion from the EMEP grid to longitude/latitude including documentation: interpol.tar.gz
- The freely available program Proj.4 can also be used to convert from our projection to a large range of other projections. Please use the following proj-parameters:

`# earth radius is 6370/50=127.4`

proj +ellps=sphere +a=127.4 +e=0 +proj=stere +lat_0=90 +lon_0=-32 +lat_ts=60 +x_0=8 +y_0=110 - Text file containing EMEP 50x50km2 (polarstereographic projection) grid coordinates, geographical coordinates and area of each EMEP grid cell: EMEPgrid.csv (ascii file(csv format))
- Text file defining the fraction (in percent) of grid cells belonging to a particular country:

emep50official_country_grid_fraction.txt

The file structure is the following: EMEP country codes, EMEP grid x coordinate, EMEP grid y coordinate, fraction of country within grid cell. (Last update: 26.11.2008, including the extension of the EMEP domain.) - Text file linking EMEP ISO codes to EMEP country/area codes and country/area names:

country_numbers.txt