Photogrammetric aerial cameras have been around since the 1930’s and aerial surveys were common after WWII. These historical air photos can be scanned, orthorectified, and mosaicked into an orthophoto.
Terrasaurus has been working closely with the University of British Columbia and mapping consultants, to processes historical air photos into quality orthophotos. We have developed certain techniques:
- Scanning guidelines
- Ground control point selection
- Photo clipping / removal of trouble sections
- Tonal balancing / removal of vignetting