The Quebec Orthophotos 1:40 000, officially called Orthophotographie noir et blanc 1/40 000, are produced by the Photocartothèque Québécoise. Orthophotos have been prepared from digital aerial photographs that have been analytically altered using elevation data from the 1 :20 000 topographic maps produced by the Quebec Ministry of Natural Resources. In addition, they have been geometrically corrected and are georeferenced. The orthophotos can be viewed in imaging software such as Adobe Photoshop, and can be used for cartographic purposes in GIS software such as ArcGIS.
To date, the McGill collection contains over a 1000 orthophotos. The regions covered are: Gatineau, Laurentians, Montéregie, Gaspésie, Schefferville, and the Eastern Townships. The collection also contains orthophotos all the major cities in Quebec.
|Official Title||Orthophotographie noir et blanc 1/40 000|
|Distributer and Producer||Géoboutique Québec (formerly Photocartothèque Québécoise)|
|Format and Size||TIFF / TWF. Each image is approximately 64MB in size.|
|Scale||1: 40 000|
|Land area covered by each image||64 square kilometres|
|Image Pixel Size||1 metre on ground|
|Extent||Province of Quebec (partial coverage)|
|Licence||Restricted to McGill University community. Must be used solely for research and educational purposes.|
|Index Map||Please consult this interactive map index determine which orthophotos correspond with your geographic area of interest.
Please note that in order to find the orthophoto numbers (eg. Q99802092), you need to click to open the individual index map for a specific area. In addition, the interactive map index is only available on Campus or via McGill VPN.
|Access||Members of the McGill Community can obtain copies of the data by filling out the Geospatial Data Request Form. Please list the desired orthophotos (ex. Q99802_151).|
|Citation||Photocartothèque Québécoise. Orthophotographie noir et blanc 1/40 000. File number. [computer file]. Québec: Ministre des Ressources naturelles et de la Faune, [year].|