Air Photo Search Guide
This is a guide to finding air photos in the Spatial and Numeric Data Services collection.
Find NTS Map Sheet
Step 1: Air photo sets are organized according to the National Topographic System (NTS) map grid. Use Toporama to identify the 1:250,000 and 1:50,000 scale numbers. Enter location, use 
tool to find NTS grid.
- 82 J is a 1:250,000 scale map sheet number
- 82 J 16 is 1:50,000 scale map sheet number
Note the 1:250,000 and 1:50,000 map grid numbers.
