# Python Gis Ecosystem Checklist

> Sub-skill of python-gis-ecosystem: Checklist (+1).

- Skill: `vamseeachanta/python-gis-ecosystem-checklist` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/python-gis-ecosystem-checklist`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/python-gis-ecosystem-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/python-gis-ecosystem-checklist

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# Checklist (+1)

## Checklist


- [ ] `gdf.crs` matches expected EPSG
- [ ] `gdf.geometry.is_valid.all()` returns True
- [ ] `gdf.shape[0]` matches expected row count
- [ ] Bounding box (`gdf.total_bounds`) falls in correct region
- [ ] Depth samples at known locations match published chart data
- [ ] Reprojection round-trip error < 1 m (project then unproject)
- [ ] Exported file opens in QGIS without errors


## Round-Trip CRS Check


```python
from pyproj import Transformer

t_fwd = Transformer.from_crs("EPSG:4326", "EPSG:32631", always_xy=True)
t_rev = Transformer.from_crs("EPSG:32631", "EPSG:4326", always_xy=True)

x_utm, y_utm = t_fwd.transform(-1.5, 57.0)
lon_back, lat_back = t_rev.transform(x_utm, y_utm)
assert abs(lon_back - (-1.5)) < 1e-6, "CRS round-trip failed"
assert abs(lat_back - 57.0) < 1e-6,  "CRS round-trip failed"
```