EM 1110-2-2907
1 October 2003
C
Process of comparing an instrument's measurements with a standard.
Calorie
Amount of heat required to raise the temperature of 1g of water by 1
C.
Camouflage detection
Another term for IR color-photograph.
photographs
Cardinal point effect
In radar, very bright signatures caused by optimally oriented corner
reflectors, such as buildings.
Cartographic
Pertaining to cartography, the art or practice of making charts or maps.
Cathode ray tube (CRT)
A vacuum tube with a phosphorescent screen on which images are
displayed by an electron beam.
C band
Radar wavelength region from 3.8 to 7.5 cm.
CCD
Charge-coupled detector.
CCT
Computer-compatible tape.
CD-ROM--Compact Disc-
CD-ROM is a computer peripheral that employs compact disc
Read Only Memory
technology to store large amounts of data for later retrieval. The
capacity of a CD-ROM disk is over 600 megabytes, the equivalent of
over 250,000 typewritten pages.
Centerpoint
The optical center of a photograph.
Change-detection images
An image prepared by digitally comparing scenes acquired at different
times. The gray tones or colors of each pixel record the amount of
difference between the corresponding pixels of the original images.
Channels
A range of wavelength intervals selected from the electromagnetic
spectrum.
Charge-coupled detector
A device in which electrons are stored at the surface of a
(CCD)
semiconductor.
Chlorosis
Yellowing of plant leaves resulting from an imbalance in the iron
metabolism caused by excess concentrations of copper, zinc,
manganese, or other elements in the plant.
Chromatic vision
The perception by the human eye of changes in hue.
CIR
Color infrared.
Circular scanner
Scanner in which a faceted mirror rotates about a vertical axis to sweep
the detector IFOV in a series of circular scan lines on the terrain.
Classification
Process of assigning individual pixels of an image to categories,
generally based on spectral reflectance characteristics.
Coastal zone color
A satellite-carried multi-spectral scanner designed to measure
scanner (CZCS)
chlorophyll concentrations in the oceans.
Coherent radiation
Electromagnetic radiation whose waves are equal in length and are in
phase, so that waves at different points in space act in unison, as in
laser and synthetic aperture radar.
Color composite image
Color image prepared by projecting individual black-and-white
multispectral images, each through a different color filter. When the
projected images are superposed, a color composite image results.
Color ratio composite
Color composite image prepared by combining individual ratio images
image
for a scene using a different color for each ratio image.
Complementary colors
Two primary colors of light (one additive and the other subtractive) that
produce white light when added together. Red and cyan are
complimentary colors.
Computer-compatible
The magnetic tape on which the digital data for Landsat MSS and TM
tape (CCT)
images are distributed.
Conduction
Transfer of electromagnetic energy through a solid material by
molecular interaction.
Cones
Receptors in the retina, which are sensitive to color. There are cones
sensitive to the red, green, and blue components of light.
Glossary-5
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