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Colour aerial photography at 1:15 000 scale of the Regional Municipality of Durham, Ontario during spring 20<\/SPAN>25 was created by First Base Solutions Inc. Colour digital orthophotography was developed from these images. Orthophotographs combine the image characteristics of the photograph with the geometric qualities of a map. Orthophotography was developed for the entire region. The 20<\/SPAN>25 digital orthophotographs have a 15cm ground pixel resolution. The 20<\/SPAN>25 digital orthophotos were subdivide into 1 kilometre by 1 kilometre tiles and were delivered in georefierenced Geotiff image files. The image tiles are horizontally referenced to 6 degree UTM projection and NAD -83 datum. Vertical control datum is referenced to mean sea level as Bench Marks established by the Geodetic Survey of Canada (CGVD28). <\/SPAN><\/P>

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