 After conducting extensive research on the topography of Japan , an 80 @-@ by @-@ 60 @-@ foot ( 24 m × 18 m ) scale model ( 1 foot : 1 mile ) of target areas was fabricated complete with mountains , buildings , railroads and the rice paddies . It also depicted clouds and fog . The films were produced using a specially mounted overhead camera . The camera was motorized and could be moved to simulate an airplane 's flight over the model . According to the New York Sun , " the camera recorded what the crew of a B @-@ 29 would see from 30 @,@ 000 feet . " Using the films , pilots of the 20th Air Force easily found their targets and were amazed at the level of detail and the accuracy that the unit was able to produce . General Arnold said the following of the units accomplishment : " there never has been anything quite so good as this for briefing men on dangerous missions . " 
