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.
Example of GRIB 2 encoding
Scanning mode 0
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GRIB 2 Code Figues
| GRIB | ||
| Number of points along a parallel | ||
| Number of points along a meridian | ||
| Basic angle of the initial production domain | ||
| Subdivisions of basic angle | ||
| Latitude of first grid point | (°) | |
| Latitude of last grid point | (°) | |
| Longitude of first grid point | (°) | |
| Longitude of last grid point | (°) | |
| i direction increment | (°) | |
| j direction increment | (°) | |
| Resolution and component flags | () | |
| Scanning Mode | () |