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ellesmith88 avatar ellesmith88 commented on August 25, 2024

Hi @sol1105 , have you managed to get this working? I'm not sure it is as simple as adding/subtracting 360. I think this is the method I had originally tried, which ending up not working (see #127 and related fix https://github.com/roocs/clisops/pull/129/files). There are also a few cases where the longitude is defined as -270 to 90 I believe, so there isn't only the 2 frames you have mentioned above.

Also, I think this section of clisops.utils.dataset_utils.check_lon_alignment

clisops/clisops/utils/dataset_utils.py

Lines 80 to 84 in d7c3d7a

# treat the values differently according to positive/negative offset
if offset < 0:
lon_vals[offset:] = lon_vals[offset:] % 360
else:
lon_vals[:offset] = lon_vals[:offset] % -360
alters the coordinate values so they are monotonically increasing/decreasing.

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sol1105 avatar sol1105 commented on August 25, 2024

Hi @ellesmith88, it is indeed not as easy as I had hoped at first. I struggled a little but I have my hopes up now the function does what I want of it. Ags example from #127 is working. I will add a few tests now to be more certain, and then create a PR so you can have a look. The shifted longitude frames (eg. -270,90) are what I need this kind of function for in regridding, since xesmf does not accept that as input (and nor should the ESGF have done 🙂 ).

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