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- SDISpatial Data Infrastructure
- SDKSoftware Development Kit
- SDLCSoftware Development Life Cycle
- SDSSSpatial Decision Support System
- SDTSSpatial Data Transfer Standard
- SeabedGround under the sea.
- SeasonalityThe objects or statistics data exhibit cyclic variation, which can be semi-regular
- SecantA line that intersects two points of the curve and cut the curve.
- Secant ProjectionMap Projection that intersects the surface of Earth, distortion is not present at the intersection.
- Secondary DataData collected by externally, by another source that is not the user.
- SectionLine features, or portions of line features, used to define a route.
- Sedimentary RockRock formed from deposits of materials within water bodies.
- SedimentsMaterials settled at the bottom of the liquid (e.g. Soild Sediments)
- SegmentationMap Generalization technique, to split/divide (segment) large area into smaller representative groups/regions.
- Seismic WaveGenerally 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.
- SelectionMap Generalization technique, choosing particular elements of the map that are representative of concept/thought, to reduce clutter on map.
- Selective AvailabilityThe intentional degredation of public (civilian) GPS signals for national security purposes.
- SemivarianceMeasure of degree of spatial indepence of points used in kriging.
- SemivariogramA diagram that indicates the spatial autocorrelation of the measured sample points, relating the semivariance and the distance of points used in kriging .
- SEPSpherical Error Probability
- ServerComputers/Machines in the network that provides services/processes/data, a single Server can have many Clients.
- SessionPeriod of time when receivers simultaneously collect and store data from same constellation of satellites at one specific point.
- Setting-Out SurveyJsurvey 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 OutfallsSewage discharge point.
- Sexagesimal SystemNumerical system based on sixty (60).
- SextantInstrument with graduated arc with sighting mechanism used for measuring angular distances between objects. Type: 1) Nautical Sextant 2) Box Sextant
- Shaded ReliefRaster image of change in elevation using light and shadows.
- ShapeThe outline of an object
- ShapefilesData format used in ESRI products.
- Ship DynamicsWay in which ship/boat moves and interacts on water. Type: 1) Pitch 2) Roll 3) Yaw 4) Heave 5) Sway 6) Surge
- ShoalShallow body of water.
- SHORANShort Range Navigation
- Shore ControlControl of survey location through the use of shore beacons, locations with established positions via land survey.
- ShorelineBoundary where water meets the land.
- Short Range NavigationType of terrestrial positioning based on towers using EM signals.
- Shortest PathA path between two vertices (or nodes) in a graph that the sum of the weights of its constituent edges is minimized.
- Shortest Path AnalysisNetwork analysis to find the path with the minimum cumulative cost.
- ShrinkageDecrease in volume of earthworks after deposition and compaction.
- SISystème International d'Unités
- SIASocial Impact Assessment
- Side Scan SonarTilts broad-beam echosounder to one side to produce a series of acoustic return signal to have more coverage of the seabed.
- Side-Looking Airborne RadarSide-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 ClampingTransmitter 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 DeteriorationLoss of quality on an electronic signal.
- Signal SquaringIt 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 RatioQuantifying the comparison between desired signal and background noise.
- Significant FigureThe significant figures are meaningful digits contributing to the precision of a number.
- SillValue in semivariance or covariance model where semivariance starts to level.
- SiltDeposits carried by running water.
- Simple RouteRoute following in one direction without looping on itself or branching.