Process includes
1. airphoto interpretation
2. scanned each 1:60 000 airphoto 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