Train Derailment and Fire, Lac Mégantic, Quebec
acquired July 4 - 6, 2013
acquired July 4, 2013 download large image (626 KB, JPEG, 2000x2000)
acquired July 4, 2013 download GeoTIFF file (2 MB, TIFF)
acquired July 6, 2013 download large image (634 KB, JPEG, 2000x2000)
acquired July 6, 2013 download GeoTIFF file (2 MB, TIFF)
acquired July 4 - 6, 2013 download Google Earth file (KML)

Early in the morning on July 6, 2013, a train carrying crude oil derailed in Lac-Mégantic, Quebec. The resulting crash and series of explosions killed dozens of people, destroyed 40 homes, and forced 2,000 people to evacuate the town. The fire was visible to the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite.

The image on the right was acquired at 6:21 GMT (2:21 a.m. local time) on July 6 by the instrument’s “day-night band,” which detects light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe signals such as city lights, auroras, fires, and reflected moonlight. The image on the left, shown for comparison, was acquired by the same instrument on July 4, before the derailment. Light sources are not as crisp in the July 6 image because of cloud cover.

VIIRS is a spectroradiometer, detecting photons of light in 22 different wavelength bands and collecting them in a similar fashion to the charge-coupled device in your digital camera. Unlike a film camera that captures a photograph in one exposure, VIIRS produces an image by repeatedly scanning a scene and resolving it as millions of individual picture elements, or pixels.

The day-night band goes a step further, determining on-the-fly whether to use its low, medium, or high-gain mode to ensure that each pixel accurately depicts the amount of light emitted. VIIRS can distinguish night lights with six times better spatial resolution and 250 times better resolution of lighting levels (dynamic range) than its predecessor instrument—the Operational Linescan System, which was flown as part of the Defense Meteorological Satellite Program (DMSP).

NASA Earth Observatory image by Jesse Allen and Robert Simmon, using VIIRS Day-Night Band data from the Suomi National Polar-orbiting Partnership. Suomi NPP is the result of a partnership between NASA, the National Oceanic and Atmospheric Administration, and the Department of Defense. Caption by Adam Voiland.


Train Derailment and Fire, Lac Mégantic, Quebec

July 10, 2013
Image Location
Image Location
More Images of the Day
Distinct Faces of Zmutt, Findelen, and Gorner Glaciers Greenland’s Summer Melt Underway