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537772490 MDU6SXNzdWU1Mzc3NzI0OTA= 3620 Idea: functionally-derived non-dimensional coordinates eteq 346587 open 0     15 2019-12-13T20:51:40Z 2021-09-24T18:13:25Z   NONE      

@Cadair and I are from the solar and astrophysics communities, respectively (particularly SunPy and Astropy). In our fields, we have a concept of something called "World Coordinate Systems" (WCS) which basically are arbitrary mappings from pixel coordinates (which is often but not necessarily the same as the index) to physical coordinates. (For more on this and associated Python/Astropy APIs, see this document). If we are reading correctly, this concept maps roughly onto the xarray concept of "Non-dimension coordinates".

However, a critical difference is this: WCS are usually expressed as arbitrary complex mathematical functions, rather than coordinate arrays, as it is crucial to some of the science cases to carry sub-pixel or other coordinate-related metadata around along with the WCS.

So our question is: is it in-scope for xarray non-dimensional coordinates to be extended to be functional instead of having to be arrays? I.e., have the coordinate arrays be generated on-the-fly from some function instead of being realized as arrays at creation-time. We have thought about several ways this might be specified and are willing to do some trial implementations, but are first asking here if it is likely to be 1. Easy 2. Hard 3. Impossible 4. PR will immediately be rejected on philosophical grounds, regardless?

Thanks!

 
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     xarray 13221727 issue

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