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- Spatial Data InfrastructureData infrastructure implementation framework for geographical (spatial) data, metadata, user and tools.
- Spatial Data Organization InformationMetadata category, information about representation and structure of dataset (e.g., raster, vector).
- Spatial Data Transfer StandardNeutral Format for transfer of spatial data, uses 'profiles' to transfer data. Type: 1) Topological Vector Profile (TVP) 2) Raster Profile and Extensions (RPE) 3) Transportation Network Profile (TNP) 4) Point Profile 5) Computer Aided Design and Drafting Profile (CADD)
- Spatial DependenceSpatial relationship between variables, where values are dependent on the location/postion.
- Spatial EffectFactors which cause the same types of features at a known point in time to create various characteristics at different geographic locations.
- Spatial FeatureGenerally refers to spatial objects' instantaneous geometric feature and relationship.
- Spatial FilterA tool used to mphasize or deemphasize image data of different spatial frequencies.
- Spatial FilteringAn image operation using a function of the intensities of pixels in a neighbor to change each pixel value I(u,v).
- Spatial FrequencyThe roughness of the tonal variations in the image.
- Spatial HeterogeneityRefers to the uneven distribution of different concentrations of each species in a specific area.
- Spatial JoinAn operation where fields from a particular layer's attribute table are appended (added) onto another layer's attribute table
- Spatial QueryA special type of database query operation provided by geospatial databases.
- Spatial ReferenceSee definition on Georeferencing.
- Spatial Reference InformationMetadata category, information about frame of reference for dataset (e.g., coordinate system, projection, map parameters, etc…).
- Spatial RelationshipRefers to the situation that an object is located in space related to other reference objects.
- Spatial ResolutionThe size of smallest object can be detected.
- Spatial SamplingCollection of a limited set of data that measures a particular phenomena that can be used to predict the same phenomena at another geographical location with similar characteristics.
- Spatio-temporal CorrelationIndicates the trend or correlation of phenomena and objects by the consideration of spatio as well as temporal factors.
- Spatio-temporal PhenomenaThe phenomena happened simultaneously because of spatiao and temporal reasons.
- SPCSState Plane Coordinate System
- Spectral ClassesClusters of data of similar reflectance value.
- Spectral RatioingEnhanced iamge resulting from the division of DN values in two spectral band.
- Spectral ReflectanceThe way which objects can reflect and/or absorb radiation.
- Spectral Reflectance CurveA graph of the spectral reflectance of an object as a function of wavelength.
- Spectral SensitivityThe relative efficiency of detection of radiation as a function of frequency or wavelength.
- Spectral SignatureA pattern which is absolute and unique of an objectand measured by remote sensors
- SphereA perfectly round geometrical and circular object in three-dimensional space which is like a completely round ball.
- Spherical AberrationDefects caused be the lens in telescope preventing the focusing of light rays.
- Spherical Coordinate SystemCoordinate system for 3D space specified by three numbers: radial distance from point of origin, polar angle measured from zenith, azimuth angle at orthogonal projection (r, θ, ϕ).
- Spherical Error ProbableMeasure of 3D precision.
- Spiral CurveUsed to provide a gradual change in curvature and superelevation between tangent and curved section.
- SplinePolynomial function to approximate smooth curve.
- Spline TextText string aligned with line feature.
- SplitGIS operation to divide the input layer into multiple layers.
- Split RouteA single route subdividing into multiple routes.
- SPOTSystem Pour d'Observation de la Terre
- Spot HeightsHeight/altitude of a point as shown on a map.
- Spread SpectrumA signal that has been deliberately spread over a bad wider than than the minimum requried for carrying information, it gives higher resistance to signal jamming and multipath.
- Spreading LossWhere loss can be an effect of the nature of the target, that energy loss is an effect of wave spread.
- Spring TideTide that occurs in New and Full Moon, resulting in a higher tide.
- SPSStandard Positioning Service
- SputnikRadio navigation system based on Earth-orbiting satellite.
- SQLStructured Query Language
- SquatThe settlement of the boat into a lower profile in the water as it increase its velocity, can cause error in depth measurement.
- Squat TestTest to determine the relationship between boat speed and transducer height.
- SSADMStructured Systems Analysis and Design Methodology
- SSMSoft Systems Methodology
- Stadia MarkMarks set at a specific distant apart (Stadia Constant) on the telescope.
- StakeholdersParties/People with vested interest in the project/location.
- Standard DeviationA measure used to quantify the amount of variation or distribution of a set of data values.