Greater Toronto Area (GTA) Orthophotography Project 2013 Coordinate system: 2958 Abstract: This orthophotography contains 20cm resolution orthophotography tiles that cover the Greater Toronto Area (GTA). The imagery used to produce this product was acquired by First Base Solutions Between April 4 2013 and May 4 2013. The image files are available in TIFF and JPEG2000 format, and are provided as separate image services.

Additional Documentation

• Metadata Information

  Language: eng; CAN

  Last Update: 2015-05-21

  Other Maintenance Requirements:

  24d228ef-2cba-4009-8186-c7fc07dfac9a

  Metadata Contact:

  Scholars Portal, Ontario Council of University Libraries Toronto Ontario, Canada

  http://scholarsportal.info

  Contact Instructions:

  gis@scholarsportal.info

  Metadata Standard:

  North American Profile of ISO19115:2003 - Geographic Information

• Citation Information

  
  

  Ontario Ministry of Natural Resources Peterborough Ontario, Canada

  Themes or Categories of the Resource: imageryBaseMapsEarthCover

  Keywords:

  Imagery, Orthophotography, Orthophotos, GTA, Aerial Imagery, Air photo, Air photos

  Place Keywords:

  Continent > North America > Canada > Ontario

  Purpose:

  This orthophoto product will serve the MNR as a topographic reference base for any new output mapping and will provide the source for subsequent base data production.

  Dataset Language: eng;CAN

  Status: completed

  Update Frequency: unknown

  Spatial Representation Type: grid

  Extent

  West Longitude: -80.174160

  East Longitude: -78.408207

  North Latitude: 44.538226

  South Latitude: 43.261648

  
  

  Supplemental Information:

• Spatial Representation - Grid:

  Number of dimensions: 2

  Axis dimensions properties:

• Reference System Information

  Reference System Identifier

  Value: 2958

  Code Space: http://www.epsg-registry.org/

• Data Quality Information

  Scope Level: series

  
  

  Process step:

  First Base Solutions created a digital full resolution colour orthophoto image of every photograph using the adjusted digital images and the digital elevation model as source material. All final ortho image processing was completed using a combination of PCI and Intergraph software. Once the adjusted image orientation data is imported, the remaining data required to produce the orthophotos was input. This included the camera calibration data, the control data and the digital elevation model. The orthorectification process is done on the Level-3 RGBI images within PCI. Intergraph OrthoPro uses a feathering algorithm to blend the images to produce seamless mosaics. Seam lines are generated automatically based on selecting the pixels with the minimum difference of colour values between two images as the cutline pixels.

• Distribution Information

  Distributor:

  Land Information Ontario (LIO), Ministry of Natural Resources Peterborough Ontario, Canada