Is anyone aware of free high-resolution orthophotography for Quebec? Something 1m resolution or greater would be ideal.
I'm looking for imagery to use in a standard GIS as files (so not as WMS or other service, or via the web.)
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there is the "Géoboutique Québec", there you will find orthophotography from 15cm to 1m covering almost all the province. They are not free, it's about $50 a photo for example, but it's a very good quality material. The site is in french. Au revoir. |
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Orbview-3 1m panchromatic and 4m multi-spectral data is now available free from the USGS EarthExplorer. I just searched for Quebec and found 100+ scenes available from 2003-2005. It's satellite imagery, not orthophotography but it is high resolution. You can pansharpen (or merge) the 1m pan and 4m multispectral to generate a 1m colour image. |
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Maybe try calling up a municipality or county and ask for their aerial photography. Where I work, we give out our SWOOP 2010 imagery for free but you have to sign a data use agreement. Might be worth a shot. |
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Landsat 7 Orthorectified Imagery over Canada "The orthoimage data set is a complete set of cloud-free (less than 10%) orthoimages covering the Canadian landmass and created with the most accurate control data available at the time of creation. The imagery has been corrected with either provincial and aerial triangulation data or, if not available, the most accurate NTDB data. The objective is to obtain accuracy of 30 metres or better in the South and 50 metres or better in the North for a 90% level of confidence. The accuracy is evaluated for each orthoimage data set. The control data, which has been extracted from sources as mentioned above, can consist of road intersection vector data or lake/island centroids. In some cases the intersection of the centre line of surficial river may have been used. The control points are distributed homogeneously within the image in specific sectors. Sectors are located in the surround of the image, in the lowest and highest elevation area of the image, and in all other areas in which overlapping image base sectors are located. The purpose is to promote the use of geomatics and educate by providing a Web and file transfer protocol (ftp) site that distributes Canada's geospatial data. The objective of the national orthoimage project is to produce a complete set of cloud-free (less than 10%) orthoimages covering the Canadian landmass using Enhanced Thematic Mapper (ETM+) data from the Landsat-7 satellite. Production, which began in fall 2000, will span a period of three to five years. " http://geogratis.cgdi.gc.ca/geogratis/en/download/landsat7.html (global coverage at the 30-meter (98-feet) spatial resolution)) Canada in UTM or LCC ftp://ftp.geogratis.gc.ca/landsat_7/ortho/geotiff/ Hint: '021L10' is Québec City , Quebec |
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