# 📐 L2 Spec — Interferometric SAR (InSAR) — deformation + DEM Mismatch-Only Spec
**ID:** `L2-108-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-108`](/artifact/l1/L1-108)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554201
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 1024 – 32768 |
| W | px | 1024 – 32768 |
| Snr db | dB | 0.0 – 30.0 |
| Pixel m | m | 0.3 – 30 |
| Coherence | — | 0.2 – 1.0 |
| Lambda cm | — | 0.5 – 30 |
| Baseline m | m | 50 – 2000 |
| Unwrap error | — | 0.0 – 0.3 |
| Baseline error | — | 0.0 – 10.0 |
| Temporal decorrelation | — | 0.0 – 0.8 |
| Atmospheric phase screen | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
12.0 + 10.0 * coherence + 0.15 * SNR_dB - 10.0 * atmospheric_phase_screen - 15.0 * unwrap_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`49e8d61155964378f1c92484a942a7fd25468fa8fad57b823ebe13c984cb1d99`
## 5. On-chain Registration
- **Chain hash:** `0xa6eae4323c8b2fde1896c7d5ae32aba26390d6ecf2e0da5f53bce9ca1ad63bc8`
- **Chain tx hash:** `0x7b31f59788903e2b701721cd9f4a3f4f3db4fae12b7ad4520be5a883a3f60f5d`
- **Chain block:** `41554201`
---
## File Mapping
This bundle consists of: `L2-108-001.md`, `L2-108-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-108-001.md` | Source of truth — edit this | Human or LLM |
| `L2-108-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-108-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._