DEGRADED –Checked, and there is a problem. Always visible, every zoom, every tier.
NOMINAL –Checked, and it is fine — with the check time on the marker.
UNKNOWN –A feed exists; this reading is stale or absent. Hollow, never teal.
NO FEED AT ALL –No commercial feed exists for this field. Marked ×.
An airport we did not check is never drawn as an airport that is fine.
Advisory — a separate axis
ADVISORY IN FORCE –A risk judgement by an issuer that does not control the airspace. A ring
around the fact — it never recolours it.
SCOPE UNKNOWN –Level or scope not established. Never an airfield-specific all-clear —
and the common case, so a missing violet ring means nothing on its own.
An airport can be open under do-not-fly, or closed in a calm country.
The two axes are never collapsed into one colour.
Freshness — when did we last look
FRESH –Checked in the last 45 min — three sweeps of the 15-minute clock.
AGING –45 min to 6 h old. Still a check; no longer a current one.
STALE –Older than 6 h. Faded, and its label drops to slate.
NO CHECK TIME HELD –Neither a sweep nor an operational check carries a time for this field.
Already hollow — there is nothing to fade.
Age fades a NOMINAL disc only, because “it was fine” is the one
claim here with a clock on it. It stays a filled teal disc at every age — a faded disc is
never a hollow ring. A degraded field is never faded: you do not dim a problem for being old.
Monitor tier — the cadence, in words
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Tier drives marker size and the zoom a field appears at — but a degraded
or closed field is never hidden to tidy the map.
Feed coverage — measured, not assumed
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As served — raw tallies from /api/roc-airports
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Layers
WHAT IS WRONG NOW
Checked, and impaired
reading the sweep…
Declared incidents
reading incidents…
These are the only things on this globe drawn in red or amber. Every other
marker is either a checked-and-fine field (teal), something we have not checked (hollow slate),
or context (dim). If nothing is listed here, nothing we checked is currently impaired.
Each row opens that domain’s risk map.
Length is the score; the word is the published level. Red and amber are reserved on this
surface for fields we checked and found impaired.