GEOPY-2773: Airborne FEM coaxial do not rotate transmitter, and ppm normalization needs to be ajusted

[domfournier]

GEOPY-2773 - Airborne FEM coaxial do not rotate transmitter, and ppm normalization needs to be ajusted

[Copilot]

Pull request overview

This PR updates the Frequency-Domain EM (FDEM/FEM) pipeline to support coaxial vs coplanar configurations (per-frequency via survey metadata) and simplifies FDEM channel handling to “real/imag” instead of separate vertical/inline/crossline channel sets. It also updates UI JSON assets and test expectations to match the new naming and metadata.

Changes:

• Add per-frequency Coaxial data handling and propagate it into receiver/source construction and normalization.
• Switch FDEM option and output naming from *_vertical_* style channels to real/imag channels.
• Update UI JSON definitions and tests to reflect the new channel names and metadata.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/run_tests/oriented_airborne_fem_receiver_test.py	Adjusts orientation test to new Iteration_0_real grouping and introduces coaxial metadata in the synthetic survey.
tests/run_tests/driver_airborne_fem_test.py	Updates test data/uncertainty wiring and expected entity names to real/imag.
simpeg_drivers/utils/synthetics/surveys/frequency_domain/fdem.py	Changes “Tx frequency” to referenced indices with a value_map back to true frequencies.
simpeg_drivers/electromagnetics/frequency_domain/options.py	Adds coaxial metadata accessor, updates channel option fields to real/imag, and changes caching behavior.
simpeg_drivers/components/factories/survey_factory.py	Builds per-frequency receiver orientation suffixes (_coaxial/_coplanar) and updates ordering/source construction.
simpeg_drivers/components/factories/source_factory.py	Passes FDEM source orientation derived from receivers (coaxial/coplanar).
simpeg_drivers/components/factories/receiver_factory.py	Adds coaxial/coplanar orientation mapping and changes component parsing rules.
simpeg_drivers/components/data.py	Updates FDEM normalization to distinguish coaxial vs coplanar scaling.
simpeg_drivers-assets/uijson/fdem_inversion.ui.json	Replaces multiple component channels with real/imag channels and updates tooltips.
simpeg_drivers-assets/uijson/fdem_forward.ui.json	Same as inversion UI JSON: switches to real/imag and updates tooltips.
simpeg_drivers-assets/uijson/fdem1d_inversion.ui.json	Renames 1D channel keys to vertical_* variants (from z_*).
simpeg_drivers-assets/uijson/fdem1d_forward.ui.json	Renames 1D channel bool keys to vertical_* variants (from z_*).

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[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.14%. Comparing base (f8dca34) to head (dc2c9e0).

Files with missing lines	Patch %	Lines
...ivers/electromagnetics/frequency_domain/options.py	80.00%	4 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/GA_4.8     #392      +/-   ##
==================================================
- Coverage           90.17%   90.14%   -0.03%     
==================================================
  Files                 129      129              
  Lines                6474     6475       +1     
  Branches              817      818       +1     
==================================================
- Hits                 5838     5837       -1     
- Misses                422      425       +3     
+ Partials              214      213       -1     

Files with missing lines	Coverage Δ
simpeg_drivers/components/data.py	93.15% <100.00%> (+0.07%)	⬆️
...g_drivers/components/factories/receiver_factory.py	90.26% <100.00%> (+0.35%)	⬆️
...peg_drivers/components/factories/source_factory.py	90.58% <100.00%> (+0.11%)	⬆️
...peg_drivers/components/factories/survey_factory.py	94.94% <100.00%> (-0.11%)	⬇️
...rs/electromagnetics/frequency_domain_1d/options.py	100.00% <100.00%> (ø)
.../utils/synthetics/surveys/frequency_domain/fdem.py	88.57% <100.00%> (ø)
...ivers/electromagnetics/frequency_domain/options.py	89.85% <80.00%> (-4.52%)	⬇️

... and 1 file with indirect coverage changes

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[MatthieuCMira]

No idea what happens here (I don't even know the goal of the app)
No comments about logic/mechanism/docstrings, as it's mostly replacement.
I guess it should be tested.