pydata / pydata/xarray

Support for monotonically decreasing indices in interpolate_na

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#4,637 3 comments 0 reactions 0 assignees View on GitHub

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contrib-good-first-issue enhancement
Dominant language
Python
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Description

Currently interpolate_na requires all indices to be monotonically increasing. If thinking about geographical dataset, indices are generally always monotonic, however in the South hemisphere the latitude is monotonically decreasing.

The current workaround is to flip the image before and after the interpolation, however should not be a lot of effort to support all monotonic indices directly within interpolate_na.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at the interpolate_na entry point and reproduce the issue with a geographical dataset whose latitude index is monotonically decreasing. The work is done when interpolate_na accepts monotonic decreasing indices directly and the flip-before-and-after workaround is no longer needed.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
data
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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