Process includes
1. air photo interpretation
2. scanned each 1:60 000 air photo in full colour at 300 dpi JPEG
3. georeferenced and edgematched images using 1:20 000 scale provincial digital base data (i.e.: hydrography and roads) for control
4. digitized line features from each image individually, reconciled edge discrepancies
5. labelled spatial features
6. quality check, proofreading