Layer: 2002 Ortho Images (ID: 61)

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Name: 2002 Ortho Images

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Type: Mosaic Layer

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Description: Colour aerial photography at 1 : 10 000 scale of the Regional Municipality of York, Ontario taken in the spring of 2002 was used to update 1999 aerial photography created by Triathlon Inc. colour digital orthophotography an digital terrain data 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 2002 digital orthophotographs have a 20cm ground pixel resolution. The 2002 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). The images were later combined by municipality and converted into nine MrSid format images covering the entire region.

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