||ES 771 Lecture|
James S. Aber
Introduction to aerial photography
People have acquired aerial photographs ever since the means have existed to lift cameras above the Earth's surface. The desire to see the Earth "as the birds do" is strong for many practical and aesthetic reasons. Aerial photography, like most other forms of remote sensing, was developed primarily for intelligence gathering and military purposes, which continue to be major applications. Air photos are taken normally from airplanes or helicopters, but many other manned or unmanned platforms may be used, including: balloons, tethered blimps, gliders, rockets, model airplanes, kites, ultra-light aircraft, and even birds. Recent innovations for digital cameras and platforms have led to new commerical, scientific and artistic possibilities for aerial photography.
Air photos may be taken in various orientations—vertical or oblique—to suit the needs of the user. The standard air photo is taken in vertical position. Film format is 9 inches (23 cm) wide, and camera lens has a 6-inch (152 mm) focal length. Photos are taken along predetermined flight lines in overlapping sequence. This allows for complete ground coverage and for stereo (3-D) viewing of overlapping photo pairs.
| || Kite aerial photography—KAP.|
Hot-air blimp aerial photography.
Manned color-infrared aerial photography.
Unmanned aircraft systems—UAS from the FAA.
Guide to drone safety from 3D Insider.
Examples of airphotos and applications—Quantum Spatial.
The basis for aerial photography, like all kinds of photography, is light-sensitive chemicals in the film emulsion. These chemicals may react to ultraviolet, visible, and near-infrared portions of the spectrum, from 0.3 µm to 0.9 µm wavelength. Many varieties of film and filter combinations have been developed for routine and special purposes in aerial photography. Digital cameras have similar spectral capabilities for visible and near-infrared photography.
|Film Type ||Uses of Film|
|b/w visible ||panchromatic, normal visible|
|b/w extended red ||panchromatic, haze penetration|
|b/w infrared ||UV, visible and near-infrared|
|color visible ||normal color: blue, green, red|
|color infrared ||false color: green, red, near-IR|
| ||Color photograph in visible light. Main house at Tallgrass Prairie National Preserve, Chase County, Kansas. Note stone walls, red roof, and surrounding vegetation. Photo © J.S. Aber.|
| ||Color-infrared photograph of main house at Tallgrass Prairie National Preserve, Chase County, Kansas. Active vegetation appears in red and pink colors. Photograph taken with a yellow filter to eliminate blue light. Photo © J.S. Aber. |
Color-infrared (CIR) photographs are especially useful for camouflage detection, recognition of vegetation and water bodies, and display of special features. Multiband photography is taking simultaneous photos in different portions of the spectrum. For example, four-band photography might include separate b/w photographs in blue, green, red, and near-infrared bands. Again, this is possible with both film and digital camera systems.
National aerial photography program--NAPP.
National high altitude photography--NHAP.
ES 771 schedule or ES 771 homepage
© Notice: ES 771 is presented for the use and benefit of students enrolled at Emporia State University. Any other use of text, imagery or curriculum materials is prohibited without permission of the instructor. Last update 2017.