Orthoimagery Specifications

• Aerial photography flown at a 1:6000 nominal scale
• Black & white photos
• Coverage of the entire City of Toronto

• Aerial photography flown at a 1:6,000 nominal scale
• Images are taken in April when the leaves are not on the trees and there is no snow
• Black & white photos
• 60% forward overlap
• 15-30% side overlap between flight lines (65% in the down town core)
• Flown every two years for ESM assembly (Orthos are produced every 4 years)
• 7.5 cm resolution (or ground pixel) results in viewing at 1:200

The Aerial photography was flown in spring of 2003 at a nominal scale of 1:6,000, with the
“leaves off”; the trees for the purposes of topographic mapping. The source aerial
photography was scanned on a photogrammetric scanner and is provided at 7.5cm resolution, where each pixel in the aerial image represents 7.5cm on the ground. The entire City of Toronto  represents approximately 200GB of image data, and is utilised in the 3D environment of the City’s Enterprise Stereoscopic Model (ESM).

• Images were taken March 31, April 5 and April 10
• Full colour photos
• 80% forward overlap
• 15-30% side overlap between flight lines
• 10cm resolution (or ground pixel) results in viewing at 1:250

• Images were taken April 12,14,15,19,23,25 May 5,7,8, and 9
• Full colour photos
• 60-80% forward overlap
• 30-60% side overlap between flight lines
• 6 cm resolution (or ground pixel) results in viewing at 1:250

• Images were taken April 22, May 4,5 and 27
• Full colour photos
• 60% forward overlap
• 30% side overlap between flight lines
• 6 cm resolution (or ground pixel) results in viewing at 1:250

• Images were taken April 17, June 2,4,6,10,15,19,20,21,22,23, and July 24
• Full colour photos
• 60% forward overlap
• 30-60% side overlap between flight lines
• 6 cm resolution (or ground pixel) results in viewing at 1:250

• Images were taken April 3, 4, 11, 12, 18, and May 1
• Full colour photos
• 60% forward overlap
• 30-60% side overlap between flight lines
• 6 cm resolution (or ground pixel) results in viewing at 1:250

• Aerial images were taken April 30, May 6,7,11,16,20,24, and June 1
• Full colour photos
• 60% or 80% forward overlap
• 40% or 70% side overlap between flight lines
• 6 cm resolution (or ground pixel) results in viewing at 1:250