Load ARIA-tools generated ionosphere stack from the template file

[ehavazli]

• Add the --iono option to load_data.py arguments so when ionosphere file is given in the template, the load_data step will read the ionoStack.vrt.
• Fix a bug in prep_aria.py which was causing the script to skip loading to ionStack.h5

Summary by Sourcery

Adds the ability to load ARIA-tools generated ionosphere stack from the template file using the --iono option in load_data.py. Fixes a bug in prep_aria.py that prevented loading to ionStack.h5.

New Features:

• Adds the --iono option to load_data.py arguments so when ionosphere file is given in the template, the load_data step will read the ionoStack.vrt.

Bug Fixes:

• Fixes a bug in prep_aria.py which was causing the script to skip loading to ionStack.h5

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request introduces the ability to load ionosphere data from a template file using the --iono option in load_data.py. It also fixes a bug in prep_aria.py that was preventing the ionosphere stack from being loaded correctly.

Sequence diagram for loading ionosphere data with load_data.py

sequenceDiagram
  participant User
  participant load_data.py
  participant mintpy.load.ionUnwFile

  User->>load_data.py: Executes load_data.py with --iono option
  load_data.py->>mintpy.load.ionUnwFile: Reads ionosphere data from file specified by --iono
  mintpy.load.ionUnwFile-->>load_data.py: Returns ionosphere data
  load_data.py-->>User: Completes data loading

Sequence diagram for loading ionosphere stack with prep_aria.py

sequenceDiagram
  participant prep_aria.py
  participant writefile.layout_hdf5

  prep_aria.py->>writefile.layout_hdf5: Writes ionosphere stack to ionStack.h5
  writefile.layout_hdf5-->>prep_aria.py: Completes writing

File-Level Changes

Change	Details	Files
Added the --iono option to load_data.py to enable reading the ionoStack.vrt file when specified in the template.	Added the --iono argument to the ARG2OPT_DICT dictionary, mapping it to the mintpy.load.ionUnwFile option.	src/mintpy/load_data.py
Fixed a bug in prep_aria.py that prevented loading to ionStack.h5.	Moved the definition of outname outside of the if statement to ensure it's always defined. Updated the out_file argument in the run_or_skip function call to use the outname variable.	src/mintpy/prep_aria.py

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[ehavazli]

Here is additional context for the bug fix in prep_aria.py:

The issue arises when smallbaselineApp.py is run directly with a template that includes ionoStack.vrt from an ARIA GUNW stack. By default, smallbaselineApp.py calls prep_aria.py with the --update flag, which causes it to skip loading certain files if their output already exists. Since ionStack.h5 is formatted the same as ifgramStack.h5, the prep_aria.py call assumes the output file name as ifgramStack.h5 and skips loading.

However, since ionStack.h5 is never created, the workflow fails at the correct_ionosphere step due to the missing file with TypeError: sequence item 7: expected str instance, NoneType found. This fix reorders the logic to define out_name before the run_or_skip() call, ensuring the conditional correctly considers ionStack.h5 and triggers its loading if needed.

@yunjunz I don't see a specific ARIA test under the tests folder. Please let me know if I should add a tests/test_load_data.py