Earth Imaging Glossary
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" C "
CALIPER
This is the method of examining the diameter of a drill hole to determine the hardness or
softness of the individual rocks.
CARBON CYCLE
The natural cycle of carbon dioxide to carbohydrates by photosynthesis and its return to the
atmosphere by animal metabolism and decomposition.
CARTOGRAPHIC
Pertaining to cartography, the art or practice of making charts or maps.
CCT--Computer Compatible Tape
CCTs are 1/2-inch-wide magnetic tapes. The term is used in reference to both single tapes
and tape sets consisting of a single logical volume of data.
CD-ROM--Compact Disc-Read Only Memory
CD-ROM is a computer peripheral that employs compact disc 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.
CHANNELS
A range of wavelength intervals selected from the electromagnetic spectrum.
CHIP
A chip is an image subset window and is used in the correlation process.
CLIMATOLOGY
The science of climates and their phenomena.
CLUSTER
A homogeneous group of units which vary "like" one another. "Likeness" is usually
determined by the association, similarity, or distance among the measurement patterns
associated with the units.
CONCATENATE
In the LAS environment, concatenate is the overlaying of an input image with one image or a
series of images using the lines and samples to calculate the projection coordinates in the
creation of a mosaicked image.
CONTOUR
Imaginary line on the ground, all points of which are at the same elevation above or below a
specified datum.
COVARIANCE MATRIX
A matrix containing the expected values derived from the products of the deviations of pairs
of random variables from their means. Covariance measures the extent to which two random
numbers vary together (i.e., varying at the same rate in the same direction).
CPES--Control Point Extraction System
CPES is software used to produce and process a single-band (Band 4) Landsat chip.
CPT--Control Point
CPTs are features of known ground location that can be accurately located on imagery.
CRYOSPHERE
The part of the Earth's surface that is perennially frozen; the zone of the Earth where ice and
frozen ground are formed.
CUBIC CONVOLUTION
A high order resampling technique in which the brightness value of a pixel in a corrected
image is interpolated from the brightness values of the 16 nearest pixels around the location
of the corrected pixel.
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Initial content for this Glossary of terms has been graciously supplied by RADARSAT International - www.rsi.ca
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