| R22: |
Is an abbreviation for a Robinson R22 helicopter. The R22 is a two seat piston engined helicopter. Very efficient and cost effective for low level oblique aerial photographic applications. |
| Radar: |
stands for "Radio Detection and Ranging". An instrument used to detect objects or precipitation by measuring the strength of the electromagnetic signal reflected back.
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| Radar surveillance: |
The radar observation of a given geographical area for the purpose of performing some radar function. |
| Radio frequency: |
A frequency that is useful for radio usually between 10 kHz and 300,000 MHz. |
| Rain: |
Liquid water droplets that fall from the atmosphere, having diameters greater than drizzle (0.5 mm). |
| Ramp: |
In general, any paved or prepared area around a hangar or runway for parking airplanes. A defined area on an airport or heliport intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking, or maintenance. |
| RAW: |
The RAW image format is the data as it comes directly off the CCD, with no in-camera processing is performed. |
| Read out register: |
The part of a CCD image sensor that reads the charges built up during an exposure. |
| Reconnaissance: |
In aviation, to fly over and look closely at an area below to gather information about it. |
| Recycle time: |
The time it takes to process and store a captured image. |
| Red eye: |
The effect encountered when light from a flash unit travels parallel to the lens axis during exposure. |
| Reflection: |
Occurs when rays of light strike a surface and bounce back again. Specular reflection occurs on even, polished surfaces; diffuse reflection occurs on uneven surfaces, when light scatters. |
| Reflex lens: |
An alternative term for mirror lens. |
| Refraction: |
The bending of light as it passes through areas of different density, such as from air through ice crystals or through a camera lens. |
| Relative humidity: |
The amount of water vapor in the air, compared to the amount the air could hold if it was totally saturated. (Expressed as a percentage). |
| Removable media: |
Storage media that can be removed from the camera. |
| Resolution: |
In the case of imagery, resolution describes the amount of detail recorded on or in an analog or digital image.
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| Resolution, interpolated: |
A process that enlarges an image by adding extra pixels without actually capturing light from those pixels in the initial exposure. |
| Resolution, optical: |
The true resolution of an image based on the number of photosites on the surface of the image sensor. |
| RGB: |
Red, Green, Blue: the three colors to which the human visual system, digital cameras and many other devices are sensitive. |
| RGE: |
Range - The total distance an aircraft can fly using a given rate of fuel consumption; the total distance a signal can be received via radio communications. |
| Roll: |
A rotational motion in which the aircraft turns around its longitudinal axis. Pushing the control stick to the left will raise the aileron on the left wing and lower the aileron on the right wing. This will cause the airplane to roll to the left. The pilo |
| Romeo: |
Stands for the letter R in the phonetic alphabet. |
| Rudder: |
A control surface on the trailing edge of the vertical part of the tail that is used to make the aircraft yaw. The rudder is controlled by rudder pedals. Pushing the left rudder pedal will tilt the rudder to the left. This will cause the nose of the aircr |
| Runway: |
The strip on the airfield where airplanes takeoff and land. |
| Runway configuration: |
The arrangement of approach and takeoff runways. |
| Rural: |
Unpopulated; farmland and open countryside. |
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