GRB

AJAX progress indicator
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  • g

  • Geometric Accuracy
    Within surveys (regardless of survey techniques) it refers to the geometry of the network as it can greatly affect accuracy of the data.
  • Geometric Correction
    Procedures aims to compensate the systematic and essentially random or unpredictable distortions caused by sensors's factors, terrain factors and atmospheric factors.
  • Geometric Dilution of Precision
    See definition on Dilution of Precision.
  • Geometric Transformation
    Conversion/Rectification of coordinates between coordinate systems based on control points and transformation equations.
  • Geopotential Surface
    Surface where gravity potential is constant.
  • Geoprocessing
    GIS operations to manipulation data (e.g., overlay, selection ,data conversion, etc…).
  • GEOREF
    Geospatial Reference
  • Georeferencing
    Process of assigning spatial coordinates to a point with reference to a pre-existing coordinate system.
  • Georegistration
    See definition on Georeferencing.
  • Georelational Data Model
    Interrelated spatial data model that stores spatial data and attribute data in separately
  • Geostationary Orbit
    A special type of Geosynchronous Orbit with a circular orbit above equator at approximately 35,786 km with orbital period approximate to Earth's rotational period thus appears to be in a fixed position in the sky.
  • Geostatistics
    Class of statistics focusing on spatial and/or spatiotemporal data.
  • Geosynchronous Orbit
    Orbit of satellite around Earth with a period matchin Earth's sidereal rotation period (approx. 23hrs 56mins 2secs), satellite will return to same position in the sky every twenty-four hours.
  • Geotechnic
    Application of scientific and engineering principles to the interpretation, understanding, use of knowledge of Earth's crust and sub-surface material.
  • Geovisualization
    Tools and techniques for visualizing spatial data.
  • GeoWall
    3D stereoscopic prjection system to allow for an immersive environment.
  • Gestalt Principles
    Rule of organization and perception of groups of images/shapes. Laws of Grouping: 1) Proximity 2) Similarity 3) Closure 4) Symmetry 5) Common Fate 6) Continuity 7) Good Gestalt 8) Past Experience
  • GI
    Geological Investigation
  • GIS
    Geospatial Information System
  • GIS Modelling
    Data model (e.g., map, chart, diagram) for representing spatial objects to better understand phenomenon/system.
  • Global Datum
    Positional data on reference system best fitted globally, often using WS84 reference system.
  • Global Interpolation
    Interpolation method using all points in the system to estimate unknown value.
  • Global Land Cover Characterization
    Produced a 1-km resolution global land cover database for the usage in a wide ragne of environmental study and modeling.
  • Global Navigation Satellite System
    Russian satellite-based system, available for civillian use to, to provide positional information to compatible device.
  • Global outlook
    Global perspective, including global and regional development trend and achievement in study area.
  • GLONASS
    GLObal NAvigation Satellite System (Russia)
  • GML
    Geography Markup Language
  • GNDVI
    Green Normalized Difference Vegetation Index
  • Gnomonic Projection
    Non-conformal map projection technique that displays all Great Circles as straight lines.
  • GNSS
    Global Navigation Satellite System
  • Good
    It exceeds the intended subject learning outcomes in some regards.
  • GPR
    Ground Penetrating Radar
  • GPS
    Global Positioning Satellite
  • GPS Biases
    Systematic Error that affects all GPS measurements, derived coordiantes and baseline. Type: 1) Satellite Dependent: Ephemeris Uncertainties, Satellite Clock Uncertainties, Selective Availability Effects 2) Receiver Dependent: Receiver Clock Uncertainties, Reference Station Coordinate(...)
  • GPS Constellation
    Makes up Space Segment of GNSS, consists of a system of satellites in orbit (e.g. GPS, GALILEO, GLONASS, BeiDou)
  • GPS Errors
    Type: 1) Unmodelled, Residual Biases 2) Carrier Phase Cycle Slips 3) Multipath 4) Antenna Phase Centre Offset 5) Random Observation Error (Noise)
  • GPS Time
    Time given by all Control Stations and satellite clocks, it is regulated by UTC when GPS time was set at zeor on 6-JAN-1980 00:00.
  • Gradient
    Physical feature of landscape defined by the Tangential angle of the horizontal, can be expressed in degrees, percentage or meters depending on circumstances and use.
  • Graph Theory
    The study of graphs, used to present relations between objects by mathematical structures.
  • Grasp of…
    Developing firm and sound understanding of overview of theology, knowledge and disciplines, including their functions and their scope of applications.
  • Graticule
    Visible horizontal and vertical reference lines on a telescope.
  • Gravel
    Loose rock material.
  • Graybody
    The object has an less than 1 but constant emmisivity at any wavelengths.
  • Graytone Symbols
    Symbols expressed in different tones of gray.
  • Great Circle
    Circle on the surface of a sphere that passes through the center of the sphere, it often represents the shortest distance between two points on the sphere and the preferred route for shipping or aircraft.
  • Green Normalized Difference Vegetation Index
    Green normalized difference vegetation index, is identical in form to the NDVI and expected that the green band is substituted for the red band.
  • Grid Bearing
    Type of Bearing, defined by the grid meridian and dependent on the projection coordinate system in use.
  • Grid Coordinate System
    Coordinates based on an Origin (O), located at the extreme south and west of the area, with the denotation of Easting (E) and Northing (N).
  • Grid Factor
    The ration by which ground measurements and grid measurements varies, calculated by the scale factor and elevation factor.
  • Grid Lines
    Lines with set coordinates at each grid's corner.