# Qgis Checklist

> Sub-skill of qgis: Checklist (+2).

- Skill: `vamseeachanta/qgis-checklist` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/qgis-checklist`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/qgis-checklist/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/qgis-checklist

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# Checklist (+2)

## Checklist


- [ ] Layer loads and `layer.isValid()` returns True
- [ ] Feature count matches expected (`layer.featureCount()`)
- [ ] CRS is correct (`layer.crs().authid()` == expected EPSG)
- [ ] Geometry is valid (run `native:fixgeometries` if not)
- [ ] Well coordinates plot in correct basin/region (visual sanity)
- [ ] Reprojected coordinates match manual calculation spot check
- [ ] Output file size is non-zero and opens in external QGIS GUI


## Coordinate Sanity Check


```python
# Spot check: print first 3 well locations
for feat in layer.getFeatures():
    pt = feat.geometry().asPoint()
    print(f"{feat['well_name']}: lon={pt.x():.4f}, lat={pt.y():.4f}")
    if limit_counter := limit_counter + 1 >= 3:
        break
```


## Marine-Offshore CRS Reference


| Region | UTM Zone | EPSG |
|--------|----------|------|
| North Sea | 31N | 32631 |
| Gulf of Mexico | 15N | 32615 |
| Brazil offshore | 23S–25S | 32723–32725 |
| Australia NW shelf | 50S | 32750 |
| Global (geographic) | WGS84 | 4326 |
| Global (web maps) | Web Mercator | 3857 |