Wildfire perimeter at the event time

NIFC's public WFIGS ArcGIS layer publishes incident perimeter polygons with incident name/key fields, fire discovery, containment and control times, polygon/create/current dates, and supports point-in-polygon spatial queries. These fields pin incident and perimeter timing, but the citation does not define official-versus-indicative status semantics, source geometry lineage, retrieval time, or a stable geometry/product version.

For a buyer-selected forest-fire event and episode, GDACS returns a GWIS-sourced MultiPolygon labelled `Affected Area`, with polygon date, event/episode and source identity, event interval, and modification time. It can determine whether a location lay within the mapped affected area, but is indicative automatic evidence rather than an official incident-command perimeter.

The pay-per-result Actor accepts buyer-supplied coordinates and screens them against the current NIFC WFIGS perimeter layer. Its guarded output supplies `in_perimeter`, WFIGS `fire_unique_id`, `fire_perimeter_date`, perimeter-versus-incident-point source type, upstream `data_last_updated`, `checked_at`, source URL, and per-source completeness status, so a current-event answer can be pinned to incident, mapped-perimeter time, provenance, and query time. It does not query a historical perimeter as of a buyer-selected event time, exposes no stable geometry version, warns that perimeters may lag spread by hours, and is not an official evacuation source.