Water Resources Division, U.S. Geological Survey 2000 Established in 1987, the National Aerial Photography Program (NAPP) collects aerial photographs of the 48 conterminous States on a 5-year cycle. Copies of NAPP images are available in black-and-white and (or) color- Figure 1. NAPP paper-print sizes and their corresponding scales for standard enlargements.* infrared film at 1 :40,000 scale. Figure 1 shows NAPP paper-print sizes and their corresponding scales for standard enlargements. application/pdf 10.3133/fs04100 en U.S. Geological Survey Ordering procedures for photographic enlargement products--NAPP, NHAP, and custom reports