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Add ZonallyPeriodicBilinearUpsample for Samudra#1316

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fix/samudra-zonally-periodic-upsample
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Add ZonallyPeriodicBilinearUpsample for Samudra#1316
elynnwu wants to merge 1 commit into
mainfrom
fix/samudra-zonally-periodic-upsample

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@elynnwu

@elynnwu elynnwu commented Jun 24, 2026

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Short description of why the PR is needed and how it satisfies those requirements, in sentence form.

Changes:

  • symbol (e.g. fme.core.my_function) or script and concise description of changes or added feature

  • Can group multiple related symbols on a single bullet

  • Tests added

  • If dependencies changed, "deps only" image rebuilt and "latest_deps_only_image.txt" file updated

Resolves # (delete if none)

@elynnwu elynnwu changed the title ported ZonallyPeriodicBilinearUpsample from m2lines Add ZonallyPeriodicBilinearUpsample for Samudra Jun 24, 2026
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elynnwu commented Jun 25, 2026

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Turning this on just in inference gives a more smooth seam at lon=0:
image

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elynnwu commented Jun 25, 2026

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Without any re-training and simply enables it during eval, it cuts the largest SST bias by ~half:
image

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