| IEEE 1394: |
A new port on the computer capable of transferring large amounts of data. Currently the fastest available port. |
| IFR: |
Instrument flight rules prescribed for the operation of aircraft in instrument meteorological conditions. Flight in most controlled airspace is conducted under IFR or Special VFR. Also used by military to denote in-flight refuelling. |
| ILS: |
Stands for Instrument Landing System - Located at most major airports, this navigational equipment employs two separate antennae to provide pilots with vertical and horizontal guidance to the runway. |
| Image: |
Two dimensional representation of a real object, produced by focusing rays of light. |
| Image browser: |
An application that enables you to view digital photos. Some browsers also allow you to rename files, convert photos from one file format to another, add text descriptions, and more. |
| Image editor: |
A computer program that enables you to adjust a photo to improve its appearance. With image editing software, you can darken or lighten a photo, rotate it, adjust its contrast, crop out extraneous detail, remove red-eye and more. |
| Image enhancement: |
Various techniques used to emphasize or accentuate the tonal and textural qualities of an image.
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| Image resolution: |
The number of pixels in a digital photo is commonly referred to as its image resolution. |
| Image sensor: |
A solid-state device containing a photosite for each pixel in the image. Each photosite records the brightness of the light that strikes it during an exposure |
| Inbound: |
A flight coming into the airport. |
| India: |
Stands for the letter I in the phonetic alphabet. |
| Indicated altitude .: |
The altitude reading obtained from an altimeter, especially from a pressure altimeter adjusted to the aircraft's estimated height above mean sea level, but uncorrected for instrument error or variation from standard atmospheric conditions. |
| Infrared: |
Rays that occur beyond the red end of the electro-magnetic spectrum and are invisible to the human eye. They can be recorded on specially sensitized films, producing images in black & white or color. |
| Instruments: |
Tools used to observe, measure and control. For example, pilots use instruments to measure and observe the altitude, speed and direction of an aircraft. |
| International Phonetic Alphabet: |
A system of words identifying the letters of the alphabet and numbers. The system was reached through international agreement, and uses words chosen for their ease of pronunciation by people of all language backgrounds. |
| Inversion: |
An increase in temperature with height. The reverse of the normal cooling with height in the atmosphere. Temperature inversions trap atmospheric pollutants in the lower troposphere. |
| Inverted: |
Flying upside down. |
| Ionosphere: |
An atmospheric zone of ionized gases that extends between 50 and 400 miles (80 to 640 kilometers) above the Earth's surface. It is located between the mesosphere and the exosphere and is included as part of the thermosphere. |
| ISO: |
International Standards Organization. Used instead of ASA as prefix to film speeds. The scale is identical to the ASA scale. |
| ISO Speed: |
The international standard for describing film sensitivity. The emulsion speed (sensitivity) of the film as determined by the standards of the International Standards Organization. In these standards, both arithmetic (ASA) and logarithmic (DIN) speed valu |
| Isobar: |
A line of equal barometric pressure on a weather map |
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