UVMET does not correctly rotate winds to Earth coordinates for the rotated pole projection
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- Dominant language
- Python
- Stars
- 498
- Forks
- 178
- PR merge metrics
- No merged PRs in 30d
Description
For the rotated pole, the uvmet product does not perform any wind rotation. This behavior is correct for the standard lat/lon projection, but not when the pole is rotated. This is also broken in NCL and has been for years.
As a workaround, users should use the COSALPHA and SINALPHA variables and perform the rotation manually using:
u_earth = u * COSALPHA - v * SINALPHA
v_earth = v * COSALPHA + u * SINALPHA
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Locate the uvmet product implementation and inspect how wind components are handled for standard and rotated-pole projections. Verify the rotated-pole case against the stated Earth-coordinate behavior, while preserving the existing standard latitude/longitude behavior; done means the product no longer requires manual COSALPHA and SINALPHA rotation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- data
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100