2002 City of Ottawa Air Photos City of Ottawa air photos cover the new City of Ottawa and also extend across the river to include Aylmer, Hull and Gatineau. The airphotos were taken from the 22 May 2002 to 7 June 2002. The 2002 photo's have been fully ortho rectified based on a 50m DEM with breakline information and approximately 200 ground control measurements.The 1:15,000 colour air photos from the City are available in a MRSid format. The original air photo images were mosaiced together and compressed using MRSid. MRSid is a compressed file format and can be viewed in ArcGIS, ArcView 3.x (with MRSid extension selected), or MRSid viewer. Coverage: City of Ottawa and parts of Aylmer, Hull and Gatineau. Scale: 1:15,000 Resolution: 1/4 metre Accuracy: +/- 1.5m per pixel MTM 3 degree zone 9 projection, NAD83.