Aerial Survey Handbook 1938

accuracy adjacent photographs advertisement aerial photographs agencies approved approximate azimuth base sheets bidder camera celluloid sheets cellulose acetate chaining crews compilation composite negatives computed contact prints contracting officer contractor control engineer control flights control lines control strips corners Craftint desirable determined drainage and culture enlargements established exposure extend field film flight lines focal length Forest Service furnish Government graphs ground control points humidity identified ground control inch indicated inspection land lens marked prior metal sheets mosaic oblique photographs outlined overlap paragraph Photogrammetry photographic paper pins plane table control plotting polyconic projections position principal point project boundaries projector radial control points radial intersections radial line radial points ratic ratioed prints satisfactory scale schedule sections securing selected serial number square miles Standard Specifications Stellar observations stereoscopic tape templet method thereof tion township transfer traverse triangulation Unless otherwise specified vellum vertical negative