EM 1110-2-2907
1 October 2003
Index of refraction (n)
Ratio of the wavelength or velocity of electromagnetic radiation in a
vacuum to that in a substance.
Instantaneous field of
Solid angle through which a detector is sensitive to radiation. In a
view (IV or IFOV)
scanning system, the solid angle subtended by the detector when the
scanning motion is stopped.
Intensity
In the IHS system, brightness ranging from black to white.
Interactive processing
Method of image processing in which the operator views preliminary
results and can alter the instructions to the computer to achieve desired
results.
Interpretation
The process in which a person extracts information from an image.
Interpretation key
Characteristic or combination of characteristics that enable an
interpreter to identify an object on an image.
IR
Infrared region of the electromagnetic spectrum that includes
wavelengths from 0.7m to 1 mm.
IR color photograph
Color photograph in which the red-imaging layer is sensitive to
photographic IR wavelengths, the green-imaging layer is sensitive to
red light, and the blue-imaging layer is sensitive to green light. Also
known as camouflage detection photographs and false-color
photographs.
ISO index
Index of the International Standards Organization, designating film
speed in photography. Higher values indicate higher sensitivity.
Isotherm
Contour line connecting points of equal temperature. Isotherm maps
are used to portray surface-temperature patterns of water bodies.
J
Japanese National Space
The agency reports to the Japanese Ministry of Science and
Development Agency
Technology.
(NASDA)
JNC--Jet Navigation Chart
The JNC series provides worldwide coverage at a scale of 1:2,000,000.
The information on these charts are suitable for aeronautical long-
range, high-altitude, high-speed travel; map features include cities,
roads, railroads, lakes, principal drainage, and permanent snow/ice
areas. The polar regions are in a Transverse Mercator projection. All
other regions are presented in the Lambert Conformal Conic projection.
Johnson Space Flight
A NASA facility in Houston, Texas.
Center
JPL
Jet Propulsion Laboratory, a NASA facility at Pasadena, California,
operated under contract by the California Institute of Technology.
K
Ka band
Radar wavelength region from 0.8 to 1.1 cm.
Kelvin Units
A Kelvin Unit refers to a thermometric scale in which the degree
intervals are equal to those of the Celsius scale and in which zero (0)
degrees equals -273.15 degrees Celsius (absolute zero)
Kernel
Two-dimensional array of digital numbers used in digital filtering.
Kinetic energy
The ability of a moving body to do work by virtue of its motion. The
molecular motion of matter is a form of kinetic energy.
Kinetic temperature
Internal temperature of an object determined by random molecular
motion. Kinetic temperature is measured with a contact thermometer.
Kodachrome
A Kodak color positive film.
L
LAC--Local Area
LAC are full resolution data recorded on an onboard tape recorder for
Glossary-16
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