National Aerial Photography Program, aerial photographs of the United States

S.l, National Aerial Photography Program, 1987-

Aerial Photographs

Air Photo NAPP

Scale 1:40,000.

Map

aerial remote sensing images

23 x 23 cm.

Earth Sciences & Map Library

Project: NAPP [a federal/state multiagency activity coordinated by the U.S. Geological Survey]
Flight height: 20,000 feet.
Focal length: 6 inches.
Film type: color infared.
Flight-line direction: North-South.
Cloud cover and haze: none.
Sun angle: 30-degrees minimum.
Contact prints with stereoscopic coverage; 60% forward overlap; ca. 15% sidelap.
Approximately 334,000 photographs will cover the conterminous United States.
Photos accompanied by microfiche index maps, made from 1:100,000 scale U.S. Geological Survey topographic quadrangles.

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