Technology Glossary : G

  • G S
  • GA
  • GA
    General Aviation
  • gain
    A general term used to denote an increase in signal power in transmission from one point to another. Gain is...
  • Gantt chart
    a diagram that shows tasks and deadlines necessary for completing a project.
  • GAR
  • gas generator
    the combination of the compressor, combustion chamber and the turbine where the airflow has been compressed to a gas.
  • gas turbine
    the turbine converts gas energy into mechanical work to drive the compressor which is linked by a rigid shaft. (Sometimes...
  • Gateway
    an electronic device that allows for two different computer or networks to connect (i.e., it "translates" between networks that use...
  • Gateway
    Gateways provide a single source through which users can locate and gain access to a wide variety of computer services....
  • Gauge
    A term used to denote the physical size of a wire.
  • Gbps
    Giga bits per second, or Gbit/s. One billion bits persecond.
  • GCA
    Ground-controlled Approach
  • GCP
    Ground Control Point
  • GDLP
    Ground Data Link Processor (the Mode S subnetwork function within the ground system that implements the OSI network layer...
  • geodetic coordinates
    Quantities which define the position of a point on the spheroid of reference (for example, the Earth) with respect to...
  • geometric correction
    The transformation of image data, such as Landsat data, to match spatial relationships as they are on the Earth. Includes...
  • geometric image calibration
    The location of every pixel in a 2-dimensional satellite image to a specific spatial location on the ground. Geometric calibration...
  • Geostationary Orbit
    An earth orbit located directly above the equator, approximately 22,300 miles above the surface. Satellites in this orbit rotate at...
  • Geostationary Orbit
    The revolutionary path traveled by a satellite in which the satellite travels in sync with the Earth
  • Geostationary Satellite
    A satellite whose circular and direct orbit lies in the plane of the Earth
  • geosynchronous
    An Earth satellite orbit in which the satellite remains in a fixed position over a geographic location on the Earth....
  • GeoTIFF
    Geographic Tagged Image File Format
  • GHz
    Giga Hertz. One billion hertz, or cycles per second.
  • GHz
  • Gigahertz GHz
    A unit of frequency equal to one billion hertz (one billion cycles per second).
    A US satellite system that lets those on the ground, on the water or in the air determine their position...
  • Global Positioning System GPS
    Refers to a constellation of GPS satellites and associated ground systems that are used for navigation.
    A US satellite system that lets those on the ground, on the water or in the air determine their position...
  • GMT
    Greenwich Mean Time
  • GMT
    Greenwich MeanTime
  • GNSS
    Global Navigation Satellite System
  • Gopher
    A menu-based system for exploring the Internet. Users locate resources by selecting resources from menus.
  • Gopher
    A tool used on the Internet which permits users to locate and retrieve information quickly throughout the Internet.
  • GPS
    Global Positioning System
  • GPWS
    Ground Proximity Warning System (warns of inadequate separation from ground and excessive sink rate close to ground)
  • GRAF
    Ground Replay and Analysis Facility
  • gravity
    The force that pushes an object. An engine works to create enough thrust to help lift the airplane and counteract...
  • Great Circle
    The intersection of a plane through the center of the Earth and the surface of the Earth. The shortest distance...
  • Greenwich Mean Time GMT
    This term has been replaced with Coordinated Universal Time (UTC).
  • grey level
    (1) A shade of grey representing a given radiometric level, or intensity, on the image. (2) A number or value...
  • gross thrust
    The thrust developed by the engine, not taking into account any presence of initial-air-mass momentum.
  • Ground
    A conducting connection between an electrical circuit and the earth or other large conducting body to serve as an earth...
  • ground control point GCP
    A geographic feature of known location that is recognizable on images and can be used to determine geometric corrections to...
  • ground data
    Supporting data collected on the ground, and information derived therefrom, as an aid to the interpretation of remotely sensed data....
  • ground resolution cell
    (1) The area of terrain that is covered by the instantaneous field of view of a detector. The altitude of...
  • ground track
    The vertical projection of the actual flight path of an aerial or space vehicle onto the surface of the...
  • ground truth ground observations
    Observations made on the ground at a site that is being imaged from space for the purpose of verifying either...
  • GRP
    Geographical Reference Points
  • GS
    Glide Slope
  • GS
    Ground Speed
  • GSFC
    Goddard Space Flight Center
  • GUI
    Graphical User Interface, which typically consists of a linked set of window-based forms (widgets) containing graphically displayed activation objects such...
  • GW
    Gross Weight

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