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# Qualification Review (QR) report

**Project:** `s2_msi_raw_generator` · ECSS-E-ST-40C Rev.1 qualification review of the **v0.3.0** baseline
(2026-07-02). The qualified capability is the **reverse chain**: running a Sentinel-2B **L1B**
backwards through the operational L0→L1B radiometric chain to reconstruct **L1A → L0plus → Synthetic L0**, validated
against the reference ESA L0 `img`. Review implementation: [SRevP](srevp.md) (QR-equivalent held as release
MR !32 + this consolidated report).

## 1. QR objectives

Confirm that (a) the requirements baseline is verified, (b) the document set is complete per the tailored
DRL, (c) the acceptance criteria of the S2 L1B E2E — the reverse chain — are met, i.e. the
Synthetic L0 agrees with the reference ESA L0 `img` (10/20 m bands ≤~4 DN), with MTF-deconvolution OFF so
noise and PSF are not re-applied, and (d) remaining limitations are known, dispositioned and risk-tracked.

## 2. Data package inventory (tailored DRL)

| DRD (ECSS-E-ST-40C Rev.1 / Q-ST-80C) | Document | Status |
|---|---|---|
| SSS (Annex B) | [sss.md](sss.md) | issued |
| IRD (Annex C) | [ird.md](ird.md) (requirements owned by the SRS) | issued |
| SRS (Annex D) | [srs.md](srs.md) — 51 requirements | issued |
| ICD (Annex E) | [icd.md](icd.md) | issued |
| SDD (Annex F) | [sdd/](sdd/index.rst) incl. [traceability](sdd/traceability.md) | issued |
| DJF | [djf.md](djf.md) — 11 decision records | issued |
| SRelD/SRN (Annex G) | [srn.md](srn.md) + `CHANGELOG.md` | issued |
| SUM (Annex H) | [sum.md](sum.md) | issued |
| SVerP + SValP (Annexes I, J) | [vv/plan.md](vv/plan.md) (combined) | issued |
| SUITP (Annex K) | [vv/suitp.md](vv/suitp.md) | issued |
| SVR (Annex M) | [vv/report.md](vv/report.md) + [vv/s2_l1b_e2e.md](vv/s2_l1b_e2e.md) | issued |
| SUITR | [vv/suitr.md](vv/suitr.md) | issued |
| SRF (Annex N) | [srf.md](srf.md) | issued |
| SDP (Annex O) incl. tailoring record | [sdp.md](sdp.md) | issued |
| SRevP (Annex P) | [srevp.md](srevp.md) | issued |
| SPAP (Q-ST-80C) | [spa-plan.md](spa-plan.md) | issued |
| Risk register | [risk-register.md](risk-register.md) | issued |
| CIDL (M-ST-40C) | [cidl.md](cidl.md) | issued |
| SCF | [scf.md](scf.md) | issued |
| ATBD (mission-specific) | [atbd/atbd.md](atbd/atbd.md) — issued v1.0 | issued |
| DPM (mission-specific) | [dpm/](dpm/index.rst) | issued |
| SMP (Annex T) | tailored out — folded into the SDP (maintenance = same MR/CI process) | tailored |

## 3. Verification & validation summary

- **Requirements:** 51 baselined; all *realized* requirements verified PASS by the cited method
  ([V&V report](vv/report.md) §4). Deferred: REQ-FUNC-043/053/062; cancelled: REQ-FUNC-090 — all with
  recorded rationale.
- **Unit/integration campaign:** 206 collected cases, **201 passed, 0 failed**, 5 env-gated skips that
  pass on the SDE ([SUITR](vv/suitr.md)); latest `main` pipeline #31052 green.
- **S2 L1B E2E (reverse-chain) acceptance criteria — all 5 met**
  ([S2 L1B E2E validation](vv/s2_l1b_e2e.md)): **primary** — the reverse-chain reconstruction agrees
  with the reference ESA L0 `img` on the 10/20 m bands (≤~4 DN), with MTF-deconvolution OFF so noise and PSF
  are not re-applied. Supporting shared-machinery checks: L0plus codec bit-exact 13/13 all bands
  (decode(L0plus)==L1A round-trip); ISP self-parse 100 % (30 642 packets); PSFD naming round-trip on
  every product; EOQC OK on both L0 forms.
- **Release evidence:** GitLab Release v0.3.0; products + run reports frozen in the generic package
  registry `e2e-s2-l1b/0.3.0`; docs site published (strict-build pipeline).

## 4. Open items & dispositions

| Item | Disposition |
|---|---|
| Real image-ISP `.bin` accounting impossible (bucket GET-403) | informative-only by design; recorded verbatim in `isp_structural.json` (RSK-01) |
| Codec not interoperable with reference decoders (§4.5.3 divergence) | documented in ICD-IF-C122 + DEC-05; packaged decoder is the consumer path (RSK-02) |
| Public L1A is DN-scaled | accepted; absolute-radiometry confidence from the Synthetic L0 matching the reference ESA L0 `img` (≤~4 DN on the 10/20 m bands) (RSK-04) |
| Deferred requirements (043/053/062) | carried to a future cycle; no impact on the qualified scope |

## 5. Conclusion

**The v0.3.0 baseline is qualified for its stated purpose** — the reverse chain: from a
Sentinel-2B L1B, reconstruct **L1A → L0plus → Synthetic L0** by inverting the operational L0→L1B chain (offset,
relative-response/PRNU, dark, un-bin, SWIR re-stage, defective, crosstalk, on-board-eq; MTF-deconvolution
OFF), validated against the reference ESA L0 `img` (10/20 m bands ≤~4 DN): the tailored DRL is complete, the
verification campaign is green with the acceptance criteria met on S2 data, and all residual
limitations are external-data properties, dispositioned and risk-tracked. No blocking findings.