Can pygrib write a grib from scratch - even for a 3D variable?

[marstonsward]

Apologies for asking this as part of an issue but there is no discussion board on this repo.
I've been trying to find a good grib2 writer for 2D and 3D variables but keep hitting roadblocks. Grib2io was promising but they seem to focus mainly on internal issues. I use pygrib extensively for reading all kind of gribs and so I would like to develop a grib2 writer around pygrib. Is there some code to in development that I can use? I will be writing experimental data and not the standard meteorological parameter.

[jswhit]

You cannot write a grib file from scratch using pygrib - a template file is needed

[marstonsward]

Thank you for responding. OK. If I have a template for 1 record, i.e., a 2D grid, how would I create a 2d and 3D grib file?
By that I mean, which sections and subsections are mutable and ought to be updated? Section 0, 1, & 2 are only updated once, but 3-7 are dynamic.

[jswhit]

@Marston I don't know the answer - you'll just have to try it and see what works and what doesn't. It would be great if you could report back on your experience here for the benefit of others.

[marstonsward]

Apologies for the late reply.
Yes, I will give this a try. Clearing some things off my plate before sketching a design.
Will be an interesting project.