# Skill: Vector Processing

Use this skill for GeoJSON/shapefile/GPKG ingestion, clipping, buffering, spatial joins, polygon validation and exports.

## Read first

- `docs/VECTOR_OPERATIONS_SPEC.md`
- `docs/GEOSPATIAL_VALIDATION_RULES.md`
- `docs/standards/GIS_STANDARDS.md`
- `docs/API_CONTRACTS.md`

## Vector rules

- Validate geometry before storage or analysis.
- Repair simple invalid geometries only when documented and reported.
- Preserve source metadata.
- Use explicit CRS transformation.
- Export GeoJSON with stable properties.
- Keep analysis outputs traceable to input layer and analysis run.

## Operations checklist

- [ ] Load vector data.
- [ ] Validate schema and geometry.
- [ ] Reproject if needed.
- [ ] Clip to area.
- [ ] Perform requested spatial operation.
- [ ] Store or export result.
- [ ] Add tests using small fixtures.

## Completion report fields

- Operations implemented.
- Geometry types supported.
- CRS behavior.
- Tests run.
- Unsupported edge cases.