Individual skill

omh-geospatial-analysis

[omh] Spatial layers to intersect: execute CRS-safe polygon overlay with measured areas, validated geometry and reproducible GeoJSON outputs. Use when the user says: geospatial-analysis, geospatial overlay, spatial intersection, intersect geojson layers, compute overlap area.

skills/omh-geospatial-analysis/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 5,473
Repository last updated: Nov 11, 2026
License: MIT

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SKILL.mdcore · 5,875 bytes
SKILL.mdcore · 5,875 bytes
SKILL.mdcore · 5,875 bytes
SKILL.mdcore · 5,875 bytes
references/execution-and-qa.mddoc · 4,427 bytes
references/full-contract.mddoc · 3,113 bytes
references/procedure.mddoc · 3,655 bytes
toolkit/LICENSE.upstreamasset · 1,305 bytes
toolkit/README.mddoc · 6,412 bytes
toolkit/examples/input.jsonasset · 501 bytes
toolkit/examples/overlay.jsonasset · 351 bytes
toolkit/scripts/analyze.pyruns · 17,267 bytes
toolkit/upstream-manifest.jsonasset · 3,163 bytes

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# Geospatial Analysis

Required: input and overlay polygon layers, explicit source and metric target CRS, new output directory and execution budget. Output: result GeoJSON, measured summary JSON, replay and provenance manifest.

**HOLD:** Missing inputs or failed contract gates. Prepared OMH routing is not execution or approval.

## Why This Exists

Polygon computations can return plausible but wrong numbers when CRS, coordinate units or geometry are invalid. This skill couples fail-closed checks to a runnable optional overlay producer and inspectable replay artifacts.

## First Steps

- Read `toolkit/README.md` and `references/execution-and-qa.md` before executing `toolkit/scripts/analyze.py`; installation and skill discovery never run it.
- Confirm the two layers, explicit EPSG declarations, study extent, projected metre CRS, output directory and finite host timeout; never guess a missing CRS.