1. If you know the 1:50,000 NTS map sheet number for your area of interest, enter it here:   
    NTS Map Sheet:   First number    Letter    Second number

    Or search for Calgary airphoto sets  
    For both searches you can limit to a range of scales or years flown by using the Ctrl or Shift keys, and you can restrict your search to those sets that include digitized airphotos:

       Year Flown
    Display only those sets with digitized airphotos

  2. If you have a place name, the latitude and longitude, or the legal land description for your area of interest, determine the NTS map sheet first, and then use the above search form to find the airphoto sets with coverage for that map sheet.