Photographs

No. A photographic enlargement only appears to show more detail than a 9-by-9 inch photograph. Photographic resolution (or image resolution) deteriorates with each enlargement factor.
At the head of the valley in Yosemite National Park - as if on a pedestal - stands Half Dome, the most colossal and recognizable rock monument in the Sierra Nevada, smoothly rounded on three sides and a sheer vertical face on the fourth.
Each National Aerial Photography Program (NAPP) frame covers a 5-by-5 mile area at 1:40,000 scale. Each National High Altitude Photography (NHAP) color infrared (CIR) frame covers an 8-by-8 mile area at 1:58,000 scale.
Yes, customers will need to acquire at least 2 consecutive digital images from the same roll and then create transparencies or contact prints to view them with a stereoscope.
It will probably take approximately 5 years to digitize the archive. A priority scheme is being developed and will be made available to the public at a later date.
The aerial photographs date as far back as the 1940's for the United States and its territories. Availability of specific coverage, film type, and acquisition dates vary from agency to agency.
Color-infrared (CIR) aerial photography - often called false color photography because it renders the scene in other than the normal colors seen by the human eye - is widely used for interpretation of natural resources.
A USGS Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. The term refers to products created in the period 1995-2000 that conform to a specific technical standard.
Digital Line Graphs (DLG) are an early GIS vector data product representing cartographic information derived from USGS maps and related sources.
Focal length is the distance from the middle of the camera lens to the focal plane (i.e. the film). As focal length increases, image distortion decreases. The focal length is precisely measured when the camera is calibrated.