Fire near Etsaut

What the satellites measured

This fire was tracked from 1 September at 14:27 to 6 September at 04:04, that is 5 days, through 67 satellite detections. The detected extent reaches 383 ha.

Detected extent

383 ha

Cumulative power

474 MW

Peak power, one pixel

42 MW

VIIRS and MODIS detections

67

These four figures cover the polar orbits alone, the ones that measure an area. The pass table below also counts geostationary detections, more frequent but too coarse for geometry, and its power column sums a whole pass where the peak above is that of a single pixel.

“Detected extent” is not “burned area”: it is the union of the ground footprints of the satellite pixels, and a 375 m pixel counts in full even when only a forest edge is burning. Compared with press figures it is in practice one and a half to three times the area reported. Detections taken at the edge of the scan swath, too coarse to measure anything at all, are excluded. These figures come from thermal detection and are not an official assessment: only the emergency services and the competent authorities are authoritative.

Timeline

Active77 hastarted on 3 September at 16:13

1. Area revised to 77 ha5 September at 18:24

   Vallée d’Aspe : l’incendie a déjà ravagé 77 hectares, le feu toujours pas maîtrisé · France Bleu

2. Area revised to 40 ha4 September at 13:17

   Incendie en Béarn : le feu a progressé dans la nuit, plus de 40 hectares brûlés, la lutte s’intensifie en vallée d’Aspe · Sud Ouest faits-divers

3. First report3 September at 16:13

   Béarn : un feu de forêt est en cours depuis le 2 septembre en vallée d’Aspe avec risque de propagation, plusieurs largages d’eau ont eu lieu · Sud Ouest faits-divers

A "contained" fire is no longer spreading but is not out: crews remain on site and it can flare up again. Statuses and areas come from press reports and official sources, matched automatically; they are not an official record : only the prefecture and the fire service are authoritative. An entry with no news for ten days is closed automatically, and each entry's history keeps track of who announced what, and when.

Replay how the fire spread

The map is framed on this fire and loads only its detections. The timeline below covers the whole known life of the fire, from the first trace, satellite or report, to the last announcement from emergency services, and the ticks on the bar mark those announcements. Detections often stop before containment: a fire stops radiating once it stops spreading, which is exactly when it is declared contained. “1 h” shows what is burning within an hour of the chosen moment : the map then follows the power curve below and empties when it falls. “12 h” stacks twelve hours , as the home map does, where stacking avoids an empty screen between two satellite passes. Both are true, but they say different things.

The detected extent

How the radiative power evolved

One point per satellite pass: the sum of the fire radiative power measured over the fire. This is the curve that says whether the fire eased off or picked up again, which no cumulative figure shows. The window covers 7 days; beyond that, clustering would merge two successive fires in the same place.

Satellite passes in detail

Follow live

The map shows active fires in 3D, with smoke plumes, forecast wind, drop zones and the live position of water bombers tracked by ADS-B, anywhere in the world.