抄録
All of Canada has been covered by aerial photograhs, except for a small area in Labrador. The aerial photographs at scales ranging from 1: 35, 000 to 1: 70, 000 are common for topographic mapping and photo interpretation.
The files of the National Air Photo Library contain close to 3 million vertical, trimetrogon and oblique photographs. The library keeps complete records of all survey photography done by and for the Federal Government. The library is very important for popularization and effective utilization of aerial photographs.
Canada is divided into 7 physiographic regions which are the Canadian Shield, the Appalachian Region, the Hudson Bay Lowland and the Arctic Archipelago, the Interior Lowlands, the Great Plains, and the Cordilleran Region.
Five aerial photographs of the Canadian Shield and the Great Plains are taken to show the physiography and land use.
