Chronic burn recurrence spatial detector engine (`src/lib/gis/burn-recurrence.ts`) #68

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opened 2026-10-14 22:28:41 +00:00 by yuris · 0 comments

yuris commented

2026-10-14 22:28:41 +00:00

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What to build

Implement the spatial intersection helper in src/lib/gis/burn-recurrence.ts to detect whether an active fire cluster centroid intersects historical burn scar polygons from 2015, 2019, or 2023.

Technical specifications

Target files:
- src/lib/gis/burn-recurrence.ts: Spatial query engine.
- src/lib/gis/__tests__/burn-recurrence.test.ts: Vitest test suite.
Interface contract:
- detectBurnRecurrence(coord: [number, number], scars: BurnScarFeature[]): RecurrenceResult.

Acceptance criteria

Correctly identifies burn history years (e.g. [2019, 2023]).
Returns empty array for unburned land.
Query executes under 2ms.

Authoritative Specifications & Reference Documentation

Titik Gambut Architecture & Subsystem Contract: docs/ARCHITECTURE.md
Copernicus Sentinel-2 STAC API: Earth Search STAC API — AWS Element84 Sentinel-2 L2A STAC catalog.
Normalized Burn Ratio (NBR) Standard: USGS Landsat NBR — Formula: (B8 - B12) / (B8 + B12).
European Forest Fire Information System (EFFIS): EFFIS Burn Severity Classification — Delta-NBR fire damage scoring.

### What to build Implement the spatial intersection helper in `src/lib/gis/burn-recurrence.ts` to detect whether an active fire cluster centroid intersects historical burn scar polygons from 2015, 2019, or 2023. ### Technical specifications 1. **Target files**: - `src/lib/gis/burn-recurrence.ts`: Spatial query engine. - `src/lib/gis/__tests__/burn-recurrence.test.ts`: Vitest test suite. 2. **Interface contract**: - `detectBurnRecurrence(coord: [number, number], scars: BurnScarFeature[]): RecurrenceResult`. ### Acceptance criteria - [x] Correctly identifies burn history years (e.g. `[2019, 2023]`). - [x] Returns empty array for unburned land. - [x] Query executes under 2ms. --- ### Authoritative Specifications & Reference Documentation - **Titik Gambut Architecture & Subsystem Contract**: [`docs/ARCHITECTURE.md`](https://git.nokopia.com/yuris/titik-gambut-next/src/branch/main/docs/ARCHITECTURE.md) - **Copernicus Sentinel-2 STAC API**: [Earth Search STAC API](https://earth-search.aws.element84.com/v1) — AWS Element84 Sentinel-2 L2A STAC catalog. - **Normalized Burn Ratio (NBR) Standard**: [USGS Landsat NBR](https://www.usgs.gov/landsat-missions/normalized-burn-ratio) — Formula: $(B8 - B12) / (B8 + B12)$. - **European Forest Fire Information System (EFFIS)**: [EFFIS Burn Severity Classification](https://effis.jrc.ec.europa.eu/) — Delta-NBR fire damage scoring.

yuris added this to the Satellite Imagery & Burn Perimeters Pipelines (Backend) milestone

2026-10-14 22:28:41 +00:00

yuris added the

backend

label

2026-10-14 22:28:41 +00:00

yuris changed title from ~~Issue 55: [Backend] Chronic burn recurrence spatial detector engine (src/lib/gis/burn-recurrence.ts)~~ to [Backend] Chronic burn recurrence spatial detector engine (src/lib/gis/burn-recurrence.ts)

2026-10-14 22:31:25 +00:00

yuris changed title from ~~[Backend] Chronic burn recurrence spatial detector engine (src/lib/gis/burn-recurrence.ts)~~ to Chronic burn recurrence spatial detector engine (src/lib/gis/burn-recurrence.ts)

2026-10-14 22:38:30 +00:00

yuris referenced this issue from a pull request that will close it,

2026-10-15 05:13:50 +00:00

feat(gis): implement chronic burn recurrence spatial detector engine #119

yuris closed this issue

2026-10-15 05:22:13 +00:00

yuris referenced this issue from a commit

2026-10-15 05:22:14 +00:00

feat(gis): implement chronic burn recurrence spatial detector engine (#119)