Map of Flooded Areas, Richelieu Valley and Missisquoi Bay, may 2011

To select layers to show, click on the calques button in the upright corner. It is possible to superpose on the base layer, optional layers to analyze flooded areas. The NASA infrared layer, combined with other satellite imagery, darker the color of flooded areas. Note that the NASA layers are slightly offset relatively to other images.

Flooded areas : We interpreted the different information available to indicate the flooded areas in May 2011. The cutting of the flooded areas is approximate and is based on visual observations and testimonies. Information is however clear enough to show the extent of flooding. One can observe the wide strips along the Richelieu River in Saint-Jean-sur-Richelieu to Lake Champlain. Also note that large portions of the flooded areas in the territories of Henryville, Noyan, Clarenceville, Venise-en-Québec and Carignan are wetlands (ie swamps, marshes, etc.). Topographic maps from Natural Resources Canada and the work of Ducks Unlimited in collaboration with the Geomatics Montérégie GéoMont confirm the existence of these large wetlands (See Base map of wetlands in Montérégie (2008)).

Satellite Imagery

NASA May 8 (natural color) 10 meters resolution. Source : Image provided by Ministère de la sécurité publique du Québec, © NASA Earth Observatory.

NASA infrared May 8 30 meters resolution. Source : Image provided by Ministère de la sécurité publique du Québec, © NASA Earth Observatory.

Ikonos-2 may 8 : 1 meter resolution. Source : Image provided by Ministère de la sécurité publique du Québec, © 2011 GeoEye.

Worldview may 10, north section : 50 cm resolution (black and white). Source : Image provided by Ministère de la sécurité publique du Québec, © 2011 DigitalGlobe.

Detailed satellite images of floods only covers the territory of Canada. However, media reports said that more than 500 homes were flooded in Vermont State.

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Pierre Béland
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