Scope: dataset
Default severity: warning
Certainty: deterministic
Reports when a dataset explicitly has no declared coordinate reference system. It does not guess a CRS from coordinate values.
PASS: CRS presence is explicitly established.
FAIL: CRS metadata is explicitly absent.
UNKNOWN: CRS presence cannot be established.
NOT_APPLICABLE: no dataset subject is available.
Remediation: establish the CRS from authoritative source metadata before assigning it. Do not infer and write a CRS solely from plausible bounds.