Technology Glossary


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  • Satellite Dish
    A kind of antenna used to pick up transmissions broadcast from a satellite.
  • SATELLITE HOME VIEWER IMPROVEMENT ACT OF 1999 SHVIA
    An Act modifying the Satellite Home Viewer Act of 1988, SHVIA permits satellite companies to provide local broadcast TV signals...
  • SATELLITE HOME VIEWER IMPROVEMENT ACT OF 1999 SHVIA
    An Act modifying the Satellite Home Viewer Act of 1988, SHVIA permits satellite companies to provide local broadcast TV signals...
  • SATELLITE MASTER ANTENNA TELEVISION SMATV
    A satellite dish system used to deliver signals to multiple dwelling units (e.g., apartment buildings and trailer parks).
  • SATELLITE MASTER ANTENNA TELEVISION SMATV
    A satellite dish system used to deliver signals to multiple dwelling units (e.g., apartment buildings and trailer parks).
  • Satellite Master Antenna Television SMATV
    A satellite dish system used to deliver signals to multiple dwelling units (e.g. apartment buildings and trailer parks).
  • saturation
    (1) In general, the point at which a further increase in input yields no further increase in output. (2) (optics)...
  • SBIR
    Small Business Innovative Research
  • scale
    (1) The ratio of a distance on an image or map to its corresponding distance on the ground. The scale...
  • scan center nominal
    The center of the cluster of scene centers of scenes imaged over the same area but at different times. Useful...
  • scan correlated shift SCS
    A systematic radiometric noise observed on both TM instruments on the Landsat 4 and 5 satellites. Since this SCS noise...
  • scan line
    The ground trace of a narrow strip that is recorded by the instantaneous field of view of a detector in...
  • scan line length
    The time of a forward or reverse scan on an imager such as TM or ETM+. In order to make...
  • scanner
    Any device that systematically breaks up an image into picture elements (or pixels) and records some attribute of each picture...
  • SCANNER
    A radio receiver that moves across a wide range of radio frequencies and allows audiences to listen to any of...
  • Scanner
    an input device that takes in an optical image and digitizes it into an electronic image represented as binary data....
  • SCANNER
    A radio receiver that moves across a wide range of radio frequencies and allows audiences to listen to any of...
  • scenes
    Each Landsat image collected is called a scene. Each Landsat scene is dimensionally 115 x 106 (185 x 170 km)...
  • Scrambler
    A device that electronically alters a pro-gram signal so that it can be seen only by persons, typically paid subscribers,...
  • Screen saver
    a computer program that automatically displays a moving image or pattern on a monitor screen after a pre-set period of...
  • SCS
    Scan Correlated Shift
  • SDH
    Synchronous Digital Hierarchy. The international version of the SONET digital hierarchy.
  • SEA TAC
    Seattle/Tacoma International Airport
  • Search engine
    software that searches for specific information or files on the Internet using search criteria that you enter.
  • Search Engines
    Permits searching of documents and databases accessible on the Internet. Search engines can be set up to search only content...
  • SECC
    A committee of the Federal Communications Commission. The STATE EMERGENCY COMMUNICATIONS COMMITTEE is responsible for preparing and maintaining the State...
  • SECC Communications Operation Order
    The California State Emergency Communications Committee may issue numbered Communications Operation Orders, as required, to provide specific instructions to broadcast...
  • Secure Sockets Layer SSL
    is a commonly-used protocol for managing the security of a message transmission on the Internet. SSL uses a public-and-private key...
  • Security
    protection from threats to the equipment, functioning and contents of a technology solution.
  • Segment
    A segment is a piece of network wire bounded by bridges, routers, repeaters or terminators.
  • SEL
    Selected
  • Self Contained Closed Products
    Products that generally have embedded software and are commonly designed in such a fashion that a user cannot easily attach...
  • sensor
    Any device that gathers energy and presents it in a form suitable for obtaining information about the environment. Passive sensors,...
  • SEP
    September
  • Server
    A server is a computer or device on a network that manages network resources. For example, a file server is...
  • SERVICE PLAN
    The rate plan you select when choosing a wireless phone service. A service plan typically consists of a monthly base...
  • SERVICE PLAN
    The rate plan you select when choosing a wireless phone service. A service plan typically consists of a monthly base...
  • SERVICE PROVIDER
    A telecommunications provider that owns circuit switching equipment.
  • SERVICE PROVIDER
    A telecommunications provider that owns circuit switching equipment.
  • SESMA
    Special Event Search and Master Analysis
  • SGS
    Svalbard Ground Station, Norway
  • Shareware
    Computer software developed for the public domain, which can be used or copied without infringing copyright. Programmers typically get paid...
  • Sheath
    The outer covering of a communication cable.
  • Shield
    A metallic layer placed around a conductor or group of conductors to prevent electrostatic interference between the enclosed wires and...
  • shock wave
    The sound waves that form in front of an airplane which act as a barrier. The plane breaks through this...
  • Shortwave Station
    A broadcast station that transmits on frequencies of 6-25 megahertz. These waves are shorter than those sent out by AM...
  • SID
    Standard Instrument Departure
  • sidelap
    The extent of lateral overlap between images acquired over adjacent ground tracks. Sidelap increases with distance from the equator.
  • SIGMET
    Significant Meteorological Information
  • signal
    The effect (for example, a pulse of electromagnetic energy) conveyed over a communications path or system. Aboard Landsat, signals from...
  • Signal to Noise Ratio
    The ratio of signal to noise measured in decibels. An indication of signal quality in analog communication systems.
  • Signal to Noise Ratio SNR
    The ratio of the level of the information-bearing signal power to the level of the noise power. SNR determines the...
  • signature
    Any characteristic or series of characteristics by which a material may be recognized. Used in the sense of spectral signature,...
  • Simplex
    Simple uni-directional transmission. Transmitter on one end and a receiver on the other.
  • Simplex Video
    One-way video communication capable of origination and reception, though not simultaneously.
  • Simultaneous Multiple Round Auction
    An auction in which many licenses are put up for auction at the same time. Bidders have the opportunity to...
  • Single Mode
    Normally referring to commonly used type of fiber optic cable.
  • SITA
    Soci
  • skew
    The degree of asymmetry or deviation from symmetry of a distribution. Distribution skewed to the right has a positive skew....
  • skew correction
    A geometric correction made on Landsat imagery to offset the skewing effect of the Earth's rotation during scene acquisition.
  • Slate
    The information shown prior to the start of the video piece, which identifies the story title, length of the piece,...
  • SLC
    Scan Line Corrector
  • slope topography
    Inclination of the terrain from horizontal. It is expressed in convenient units, such, as percent, feet per mile, etc.
  • SMA
    Scan Mirror Assembly
  • SME
    Scan Mirror Electronics
  • SNMP
    Simple Network Management Protocol. A protocol specified by the Internet Engineering Task Force (IETF) for exchanging network management information between...
  • SNR
    Signal to Noise Ratio, also abbreviated S/N ratio.
  • SO
    Southern Airways
  • Software
    the computer programs that tell the computer what to do. Software can be divided into two groups, operating system software...
  • Software features
    the capabilities offered by software that make it easy and effective to use.
  • Solar Outage
    Solar outages occur when an antenna is looking at a satellite, and the sun passes behind or near the satellite...
  • SONET
    Synchronous Optical Network.
  • sonic speed
    Speed of sound, about 760 miles per hour.
  • SOP
    Standard Operating Procedure
  • SOPA
    Standard Operating Procedure Amplified
  • SOT
    Sound on Tape
  • sound barrier
    A great increase in drag that is caused when an airplane's speed approaches the speed of sound. When a plane...
  • Soundbite
    A soundbite is an interview or sound from a source other than the narration or voice over.
  • Source Code
    Source code is instructions to the computer in their original form. Initially, a programmer writes a program in a particular...
  • SP
    Space
  • Space Frequency
    the audio frequency of AFSK modulation that corresponds to a digital bit of zero (0); the space frequency of EAS...
  • Space Oblique Mercator SOM
    A variation on the basic Mercator map projection based on the dynamics of satellite motion. The movements of the Landsat...
  • Spam
    Spam refers to electronic junk mail or junk newsgroup postings. Some people define spam even more generally as any unsolicited...
  • spatial filter
    An image transformation, usually a one-to-one operator used to lessen noise or enhance certain characteristics of the image. For any...
  • SPD
    Speed Mode
  • Special Emergency Radio Services SERS
    A Private Land Mobile Radio Service employed by persons or organizations engaged in emergency medical and rescue service, health care,...
  • Specialized Common Carrier SCC
    A company (other than the telephone company) that provides point-to-point communications service on a common carrier basis. For example, point-to-point...
  • Specialized Mobile Radio Services SMR
    A private, two-way radio system providing land mobile communications service to eligible persons on a commercial basis. Typical SMR customers...
  • specific heat
    The ratio of the thermal capacity of a substance to the thermal capacity of water.
  • spectral band
    An interval in the electromagnetic spectrum defined by two wavelengths, frequencies, or wave numbers, e.g. Landsat 7 ETM+ Band 1...
  • spectral interval
    The width, expressed either in wavelength or frequency, of a particular portion of the electromagnetic spectrum. A given sensor, such...
  • spectral response
    The response of a material as a function of wavelength to incident electromagnetic energy, particularly in terms of the measurable...
  • spectral signature
    The quantitative measurement of the properties of an object at one or several wavelength intervals. Spectral signature analysis techniques use...
  • spectral striping
    Non-uniform detector-to-detector variations that are due to different spectral responses of the adjacent detectors. Spectral striping is rarely considered a...
  • SPECTRUM
    The range of electromagnetic radio frequencies used in the transmission of sound, data and television.
  • SPECTRUM
    The range of electromagnetic radio frequencies used in the transmission of sound, data and television.
  • Spectrum
    The range of electromagnetic radio frequencies used in the transmission of sound, data, and television.
  • Spectrum Allocation Management
    The assignment of available spectrum space; the coordination of spectrum used to maximize efficiency and to prevent interference.
  • Spectrum Auction
    A public sale of spectrum space in which the price is increased by bids until the highest bidder becomes the...
  • speed of sound
    The rate at which sound waves travel. This is about the speed of 750 MPH. The air waves gather together...

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