crs-sanity-check

id	crs-sanity-check
name	CRS Sanity Check
description	Validate coordinate systems, units, and reprojection assumptions before analysis.

CRS Sanity Check

When To Use

• Use before any overlay, buffer, distance, or area operation.
• Use when data comes from multiple providers or mixed formats.
• Use when coordinate metadata is missing or contradictory.

Workflow

1. Inspect declared CRS for every input layer.
2. Confirm axis order and unit assumptions.
3. Identify a shared analysis CRS and justify it.
4. Reproject inputs only once to the selected CRS.
5. Validate extents and spot-check coordinates after reprojection.

Guardrails

• Do not compute distance or area in geographic degrees unless explicitly intended.
• Do not proceed when CRS metadata is absent without an explicit fallback strategy.
• Record original CRS and transformation choices in the final output notes.