GRB

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  • s

  • SDI
    Spatial Data Infrastructure
  • SDK
    Software Development Kit
  • SDLC
    Software Development Life Cycle
  • SDSS
    Spatial Decision Support System
  • SDTS
    Spatial Data Transfer Standard
  • Seabed
    Ground under the sea.
  • Seasonality
    The objects or statistics data exhibit cyclic variation, which can be semi-regular
  • Secant
    A line that intersects two points of the curve and cut the curve.
  • Secant Projection
    Map Projection that intersects the surface of Earth, distortion is not present at the intersection.
  • Secondary Data
    Data collected by externally, by another source that is not the user.
  • Section
    Line features, or portions of line features, used to define a route.
  • Sedimentary Rock
    Rock formed from deposits of materials within water bodies.
  • Sediments
    Materials settled at the bottom of the liquid (e.g. Soild Sediments)
  • Segmentation
    Map Generalization technique, to split/divide (segment) large area into smaller representative groups/regions.
  • Seismic Wave
    Generally produced using technologies that can generate a single pulse or a continuous sweep of energy, the signal has both reflective and refractive qualities and can trave through mediums such as water and/or layers of rocks.
  • Selection
    Map Generalization technique, choosing particular elements of the map that are representative of concept/thought, to reduce clutter on map.
  • Selective Availability
    The intentional degredation of public (civilian) GPS signals for national security purposes.
  • Semivariance
    Measure of degree of spatial indepence of points used in kriging.
  • Semivariogram
    A diagram that indicates the spatial autocorrelation of the measured sample points, relating the semivariance and the distance of points used in kriging .
  • SEP
    Spherical Error Probability
  • Server
    Computers/Machines in the network that provides services/processes/data, a single Server can have many Clients.
  • Session
    Period of time when receivers simultaneously collect and store data from same constellation of satellites at one specific point.
  • Setting-Out Survey
    Jsurvey used to set out exact position of structures within the legal boundary of land/plot/parcel/property, mainly used in construction of new buildings.
  • Sewer Outfalls
    Sewage discharge point.
  • Sexagesimal System
    Numerical system based on sixty (60).
  • Sextant
    Instrument with graduated arc with sighting mechanism used for measuring angular distances between objects. Type: 1) Nautical Sextant 2) Box Sextant
  • Shaded Relief
    Raster image of change in elevation using light and shadows.
  • Shape
    The outline of an object
  • Shapefiles
    Data format used in ESRI products.
  • Ship Dynamics
    Way in which ship/boat moves and interacts on water. Type: 1) Pitch 2) Roll 3) Yaw 4) Heave 5) Sway 6) Surge
  • Shoal
    Shallow body of water.
  • SHORAN
    Short Range Navigation
  • Shore Control
    Control of survey location through the use of shore beacons, locations with established positions via land survey.
  • Shoreline
    Boundary where water meets the land.
  • Short Range Navigation
    Type of terrestrial positioning based on towers using EM signals.
  • Shortest Path
    A path between two vertices (or nodes) in a graph that the sum of the weights of its constituent edges is minimized.
  • Shortest Path Analysis
    Network analysis to find the path with the minimum cumulative cost.
  • Shrinkage
    Decrease in volume of earthworks after deposition and compaction.
  • SI
    Système International d'Unités
  • SIA
    Social Impact Assessment
  • Side Scan Sonar
    Tilts broad-beam echosounder to one side to produce a series of acoustic return signal to have more coverage of the seabed.
  • Side-Looking Airborne Radar
    Side-Looking radar (SLR) is the airborne and spaceborne radar remote sensing system equiped with an antenna which is fixed below the aircraft and pointed to the side.
  • Signal Clamping
    Transmitter is connected to the target to provide the primary current, the flow of current would have to be sustained between the target and the ground, transmitter is not grounded.
  • Signal Deterioration
    Loss of quality on an electronic signal.
  • Signal Squaring
    It relies on carrie phase observables and is dependent on the creation of an intermediate/beat frequencing through multiplying the incoming carrier by itself.
  • Signal-to-Noise Ratio
    Quantifying the comparison between desired signal and background noise.
  • Significant Figure
    The significant figures are meaningful digits contributing to the precision of a number.
  • Sill
    Value in semivariance or covariance model where semivariance starts to level.
  • Silt
    Deposits carried by running water.
  • Simple Route
    Route following in one direction without looping on itself or branching.