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- Each partner will provide their eps data on a 1.5/1.5 regular lat-lon grid for both ocean and atmosphere. First grid point is 90N 0E. The data will be archived first from west to east to west (OE to 358.5), and then from North north to South south (90N to 90S). The related GRIB 2 meta data called scanning mode should equal to 0.
Scanning mode 0
- i scans positively (west to east)
- i points are consecutive
- j scans negatively (north to south)
- i scans positively (west to east)
- Grids are defined in GRIB2 using an accuracy of 1/1000000 (one millionth) of a degree. If this accuracy is not sufficient to describe your grid (latitude/longitude of first and last points, as well as grid increments) without loss of information, you can use a GRIB2 feature that provides a way to describe any regular grid. See the page on encoding global latitude/longitude grid for more details.
Ocean parameters
- follow the same rules but the data is on a 1.0/1.0 regular lat-lon grid
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ECMWF makes available a GRIB decoding library (ecCodes) for the benefit of the WMO community. ecCodes can be freely downloaded from here and the documentation can be found here.
ecCodes provides a simplified access to GRIB2 headers through a set of virtual keys documented here.
S2S GRIB2 checking tool
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(*) ecCodes version>= 2.13.0 is needed to see correct MARS meta data