Here's an (ahem) extremely important discussion on the prospects for xarray to extend from the coordinates-only model (like that of netcdf) for geo reference:
https://discourse.pangeo.io/t/example-which-highlights-the-limitations-of-netcdf-style-coordinates-for-large-geospatial-rasters/ I'm heartened to see this recognized at this level. I think GDAL per se should feature in this discussion prominently, and not just the downstream Python packages that are mentioned. For my input, I'll be highlighting examples of - degenerate rectilinear coordinates, and the problem of whether to assign a regular grid there (with a trivial lightweight Translate a la -a_ullr), or to define a new regular grid and push it through the Warp api, as a dataset that picks up or can be pointed to the 1D coordinate arrays. This has been the crux of the issue for me, I get to decisions where it's not clear what was intended or what should be done going forward. - actual curvilinear coordinates, and the very very general power of that to resolve to a regular grid with very simple specification (specify some or nothing of target/extent/resolution/crs/dimension). Key problems here are when the coordinate arrays are not auto-detected (rare) or when the longitudes are unwrapped (less rare). - that extent+dimension is complementary to the affine transform, and way more user-friendly way to work with rasters for the assign and/or target specification step (this is huge in R since the {raster} package ca. 2009 and very well supported by Warp and Translate). It's true that extent+dimension can't do shear params but it's a perfectly valid way to work and flipping from transform to extent is trivial numerically. I hope some more voices from this community pitch in as well, very happy to discuss here or offline about any of this. I'm not really a technical expert but I have a good overview of the landscape that GDAL sits in, and I'm making similar pitches for involvement in the R communities. Cheers, Mike -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com
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