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Libraries continue to provide services in an online environment. Virtual service hours today: 9:00 AM to 8:00 PM. 10:00 AM to 4:00 PM. Physical locations remain closed. You can return your books to the exterior book drop on the East side of the TFDL. More information on the Covid 19 page.

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.


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