rafaqz
non-dimension coordinates
In Python Xarray, we can have non-dimension coordinates that contain coordinate data, but are not a dimension coordinate (see https://docs.xarray.dev/en/stable/user-guide/data-structures.html#coordinates) .
I'm just wondering if there is any similar support for this in the ecosystem. Actually this idea is kinda of useful for working with multidimensional coordinates.
Have been thinking about something like this in Rasters as CF standards allow having multiple lookup coordinates for a single dimension. Is that what you mean?
My current idea is to allow dimensions/lookup nesting, so a dimension can have alternative names and associated lookups. Then e.g. X=At(100) may be in metres but you can use Lon=At(100) and that's degrees. The Lon dimensions would be a field of the X dimensions lookup array, and used as a fallback when Lon is not found in the normal top level Tuple of dims.
I am more thinking about multidimensional coordinates. You can check the draft PR here #1086 . I am not sure it's a good idea to put the type in this package or just split it into a new package.
Ah so you want to mix the dimensions of the dimensions and coordinates? So X and Y can be 1D regular but there is also a 2D lon and 2D lat associated.
Right. Something Like that, I think it would be beneficial to differentiate between coordinate and dimension.
Try to avoid starting a new package
This functionality is planned for our overhaul of CF standards in Rasters.jl. DD lookups will be able to represent any CF object which includes single and multidimensional co-ordinate variables. Without changing the dims interface ;)
But it will be a few months.
Thanks for clarifying! That sounds great. A few months is no problem—I can work around it in the meantime. Looking forward to the overhaul and the DD lookups supporting full CF objects.
