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Field Descriptions:

NTS50 - Canadian 1:50,000 National Topographic System Index Map value.

YEAR - A list of all years aerial photos were taken within the extent of each NTS 1:50,000 mapsheet. NULL values indicate that no aerial photos exist for the extent of that mapsheet. Unknown values indicate where aerial photos exist within the extent of the mapsheet and the year of acquisition is not known. Unknown photos are not confirmed as on file with the Surveys and Mapping Division at the Howley Building in St. John's and require further investigation. Photos may have been destroyed or stored in another location. Update as data is acquired.