support HyP3 INSAR_GAMMA Sentinel-1D

[Alex-Lewandowski]

Description of proposed changes

Currently, attempting to load a HyP3 INSAR_GAMMA interferogram generated using a reference and/or secondary Sentinel-1D SLC causes a ValueError: Failed to parse product name from filename: S1DD_*_unw_phase.tif

This PR adds Sentinel-1D support.

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Summary by Sourcery

Add support for parsing HyP3 INSAR_GAMMA products generated from Sentinel-1D data.

New Features:

• Recognize Sentinel-1D HyP3 INSAR_GAMMA product filenames when extracting product name and type.

Tests:

• Extend prep_hyp3 tests with a case covering Sentinel-1D INSAR_GAMMA filenames.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Extends HyP3 INSAR_GAMMA product filename parsing and tests to support Sentinel-1D (S1D*) products by broadening the Sentinel-1 mission code pattern and adding a regression test.

Flow diagram for updated INSAR_GAMMA filename parsing

flowchart TD
    A[Input filename] --> B{matches INSAR_ISCE_SINGLE?}
    B -- yes --> C[set job_type INSAR_ISCE_SINGLE]
    B -- no --> D{matches INSAR_ISCE_MULTI_BURST?}
    D -- yes --> E[set job_type INSAR_ISCE_MULTI_BURST]
    D -- no --> F{matches S1ABCD_INSAR_GAMMA_pattern?}
    F -- yes --> G[set job_type INSAR_GAMMA]
    F -- no --> H[raise ValueError]

    subgraph S1ABCD_INSAR_GAMMA_pattern
        I("pattern S1[ABCD]{2}(_\d{8}T\d{6}){2}_(VV|HH)[PRO]\d{3,4}_INT\d{2}_G_[uw][ec][123F]_[0-9A-F]{4}")
    end

    F -. uses .-> I

Loading

File-Level Changes

Change	Details	Files
Extend INSAR_GAMMA filename parsing to accept Sentinel-1D mission identifiers and add test coverage.	Broaden regular expression mission code character class from [ABC]{2} to [ABCD]{2} when matching INSAR_GAMMA product filenames. Add a new unit test case verifying that a Sentinel-1CD INSAR_GAMMA filename parses to the expected product name and type.	src/mintpy/prep_hyp3.py tests/test_prep_hyp3.py

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• The updated regex now allows D in both character positions after S1 (i.e., S1[ABCD]{2}), but only the first character represents the platform while the second encodes mode/beam; consider tightening this to the actual allowed values for the second character or adding a brief comment explaining why D is valid there as well.
• Since INSAR_GAMMA filenames can have suffixes like _unw_phase_clip.tif, it might be clearer to explicitly anchor the regex at the start (^) and rely on the absence of $ to document that only the prefix is validated rather than the full filename.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The updated regex now allows `D` in both character positions after `S1` (i.e., `S1[ABCD]{2}`), but only the first character represents the platform while the second encodes mode/beam; consider tightening this to the actual allowed values for the second character or adding a brief comment explaining why `D` is valid there as well.
- Since INSAR_GAMMA filenames can have suffixes like `_unw_phase_clip.tif`, it might be clearer to explicitly anchor the regex at the start (`^`) and rely on the absence of `$` to document that only the prefix is validated rather than the full filename.

## Individual Comments

### Comment 1
<location path="tests/test_prep_hyp3.py" line_range="23-28" />
<code_context>
         'S1BC_20210807T053645_20250729T053630_VVP1452_INT80_G_weF_9C74_unw_phase_clip.tif'
     ) == ('S1BC_20210807T053645_20250729T053630_VVP1452_INT80_G_weF_9C74', 'INSAR_GAMMA')

+    assert _get_product_name_and_type(
+        'S1CD_20260605T013230_20260606T013240_VVR001_INT80_G_ueF_66F3_foo.tif'
+    ) == ('S1CD_20260605T013230_20260606T013240_VVR001_INT80_G_ueF_66F3', 'INSAR_GAMMA')
+

</code_context>
<issue_to_address>
**suggestion (testing):** Add a regression test that matches the originally failing S1DD *_unw_phase*.tif filename

The original failure was for `S1DD_*_unw_phase*.tif`, but this test uses an `S1CD_...foo.tif` name. Please add a test case with a realistic S1D unw phase filename (e.g. `S1DD_..._unw_phase_clip.tif` or `..._unw_phase.tif`, matching actual HyP3 output) and assert that `_get_product_name_and_type` returns the correct product name and `INSAR_GAMMA` type for it.

```suggestion
    assert _get_product_name_and_type(
        'S1CD_20260605T013230_20260606T013240_VVR001_INT80_G_ueF_66F3_foo.tif'
    ) == ('S1CD_20260605T013230_20260606T013240_VVR001_INT80_G_ueF_66F3', 'INSAR_GAMMA')

    # Regression test for original S1DD unw_phase failure (HyP3-style filename)
    assert _get_product_name_and_type(
        'S1DD_20210807T053645_20250729T053630_VVP1452_INT80_G_weF_9C74_unw_phase_clip.tif'
    ) == ('S1DD_20210807T053645_20250729T053630_VVP1452_INT80_G_weF_9C74', 'INSAR_GAMMA')


    # Old INSAR_ISCE_MULTI_BURST naming convention
```
</issue_to_address>

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