CU of side of plane, 414 Squadron insignia. Sequence on crew boarding DC-4 aircraft at Calgary base, plane taxiing away past other similar aircraft. LAS of propeller beginning to turn, plane taxiing and taking off past camera. AIR TO AIR MLSs of DC-4 in flight over mountainous country, clouds in background. Sequence on airman loading photo equipment in DC-4 at Rockcliffe Air Base in Ottawa, crew boarding plane, propeller starting, revving, aircraft taxiing past camera. Side shot of airfield as camera plane takes off, parked aircraft on field. Ground shot of air force DC-4 starting out, taking off past camera. AIR TO AIR HASs of aircraft in flight. Interior shot of aircraft, crewman photographer installing camera, donning oxygen mask and starting electrically driven camera. Vertical AERIAL SHOTs of country. Oblique AERIAL SHOTs of Rockcliffe Airport and Ottawa River. Sequence on developing of aerial photos, photos by the hundreds being developed, dried, inspected, printed. Shot of large number of prints laid out on large table so as to form a photo mosaic of surveyed land. (22/05/1948)