Earth Imaging Glossary
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EBCDIC--Extended Binary Coded Decimal Interchange Code
An 8-bit character encoding scheme used primarily on IBM machines.
ECOSYSTEM
An ecologic system composed of interacting organisms and their environments. The result of
interaction between biological, geochemical and geophysical systems.
EDAC--Earth Data Analysis Center
EDAC, also known as the Technology Applications Center (TAC), has served as a NASA
center since 1964. EDAC operates under the objective of transferring Earth-observing
technologies to the user community. It supports and works directly with industries
developing technologies related to space science and collaborating with them to enhance and
encourage the user community to adopt the new technologies. EDAC also supports and
works with public agencies, private citizens, educational organizations, and volunteer groups
to ensure ready accessibility to NASA generated space imagery.
For further information, contact: Earth Data Analysis Center
EDC--Earth Resources Observation Systems Data Center
EDC is a national archive, production, distribution, and research facility for remotely sensed
data and other geographic information. See also EROS.
IPS--Space Imaging Image Processing System
EIPS is software that calculates the maximum number of image lines that can be consolidated
into a tape record.
ELECTROMAGNETIC SPECTRUM
Electromagnetic radiation is energy propagated through space between electric and magnetic
fields. The electromagnetic spectrum is the extent of that energy ranging from cosmic rays,
gamma rays, X-rays to ultraviolet, visible and infrared radiation including microwave energy.
EMISSION SPECTROGRAPHY
This destructive analytical technique is used to determine concentrations of specific chemical
elements based on their emission or absorption of specific wavelengths of electromagnetic
radiation.
EPA--Environmental Protection Agency
Established on December 2, 1970, the EPA is charged with protecting and enhancing the
environment for present and future generations to the fullest extent possible under
Congressional law with responsibilities including the control of solid waste, pesticides,
radiation, and toxic substances, and the abatement of air and water pollution. The EPA
coordinates research and antipollution activities with State and local governments,
educational institutions, private and public groups, and individuals.
For further information, contact: EPA Region V
EPA Region VII
EPHEMERIS
A table of predicted satellite orbital locations for specific time intervals. The ephemeris data
help to characterize the conditions under which remotely sensed data are collected and are
commonly used to correct the sensor data prior to analysis.
EROS--Earth Resources Observation Systems
The EROS program was established in the early 1970s, under the Department of the Interior's
U.S. Geological Survey, to receive, process, and distribute data from United States Landsat
satellite sensors and from airborne mapping cameras. See also EDC.
ESIC--Earth Science Information Center
The U.S. Geological Survey (USGS) operates a network of ESICs designated to distribute
USGS earth science data and related products. There are more than 75 ESIC offices
throughout the United States. Major offices are managed by the USGS, but numerous
affiliate offices are managed by various State and Federal agencies.
ESIC address information and other ESIC information is available through the ESIC Home
Page.
ESRI--Environmental Systems Research Institute
Headquartered in Redlands, California, ESRI provides Geographic Information System (GIS)
software, products, and services.
EXPORT
EXPORT creates an ARC/INFO interchange file to transfer coverages, INFO data files, text
files, and other ARC/INFO files between various computer systems. An interchange file
contains all coverage information and appropriate INFO file information in a fixed length,
ASCII format. It can be fully or partially compressed as well as uncompressed ASCII
depending upon the given EXPORT option.
EXTRAPOLATE
To infer (values of a variable in an unobserved interval) from values within an already
observed interval.
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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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