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- Frequency ModulationModulation of radio wave by frequency, where amplitude remains constant.
- Frequency-DomainWhere frequency of signal constantly varies with time.
- Fresnel RegionRegion of electromagnetic field around antenna.
- FSForesight
- Full-Spectral ColourColours in the full (light) spectrum.
- Function-Oriented DesignProgram design based on functions of the program and its interaction with the centralized shared memory.
- Fundamental KnowledgeThe middle level of understanding, where base knowledge (e.g. basic concepts, components and functions) should be mastered.
- FuzzyA logic form of many-valued logic which deals with reasoning that is approximate rather than fixed and exact
- Fuzzy ClassificationA classsification approach aims to deal with the mixed-pixel problem by applying the fuzzy logic concept.
- Fuzzy SetCollection of elements defined by degree of membership, grading members on a continuous scale that members can have partial and/or uncertainty in their membership.
- Fuzzy SetsElements in the sets have degrees of membership.
- Fuzzy ToleranceDistance tolerance between vertices, vertices within fuzzy tolerance are merged to a single common location.
g
- G-TestTest of goodness, likelihood of statistical significance, measure of variation of data from an ideal prediction.
- GainProcess of amplifying signal to match range of display.
- GalileoA European global satellite navigation system.
- GamutComplete subset of certain colours (e.g. CYMK, RGB).
- GANTT ChartsGraphical charts for project management.
- Gap Analysis ProgramA multi-level program across state,region and nataion built to offer geographic data and other infamation about natural vegetation,distribution of native vertebrate species and land ownership.
- Gap Closure ToleranceVectorization setting on GIS software, detemines the number of pixels that can be jumped over in a raster.
- Gaussian DistributionA continuous probability distribution presents the probability that any real observation will fall between any two real limits or real numbers, as the curve approaches zero on either side.
- Gaussian EliminationAn algorithm used to solve systems of linear equations
- GazetteerGeographical dictionary, containing list of geographical names and terms, used with a map.
- GBASGround-Based Augmentation System
- GCMDGlobal Change Master Directory
- GCPGround Control Point
- GDOPGeometric/General Dilution of Precision
- General Reference MapMap with the objective of showing locations (points of interests) and features (e.g., roads, coastlines, water bodies, etc…), map without a specific purpose.
- General Systems TheoryStudy of Systems in general, attempt to describe/model the real world phenomena into a set of structured processes and networks.
- GeneralizationTechnique for presenting information/data on the map in order to represent a certain concept or to make it easier to understand. Type: 1) Selection 2) Simplification 3) Displacement 4) Smoothing 5) Enhancement 6) Dissolution 7) Segmentation 8) Aggregation 9) Conversion 10)(...)
- GEOGeosynchronous Equatorial Orbit
- Geo-demographyDescription of population according to location (spatial information), analysis of demographic data by spatial attributes.
- Geocentric CoordinateEarth-centered coordinate system defined as Cartesian (X, Y, Z).
- Geocentric LatitudeLatitude with center of Earth as reference.
- Geocentric OrbitOrbits of Satellites (natural and man-made) around the Earth, classifcations of orbits can be by: Altitude, Inclination, Eccentricity, Direction, and Geosynchronous.
- GeocodeAssigning additional positional information (e.g., address) to a location/feature, enriching the description of a location.
- GeocomputationApplication of IT to spatial problems (e.g., collection, storage, visualization, modelling of spatial data).
- GeodesyScience of measuring and understanding of Earth's geometry and geometric shapes, orientation in space and positioning of points on its surface.
- Geodetic Control NetworkA network of pre-established points that are physically marked and are precisely located and documented, they form a base to which coordinates can reference into.
- Geodetic CoordinateA set of reference points used for positioning as defined by WGS84.
- Geodetic HeightSee defintion on Ellipsoidal Height.
- Geodetic LatitudeSee definition on Latitude.
- Geodetic SurveyBranch of surveying of the highest order to establish position using various means (e.g. GPS).
- Geographic Coordinate SystemOften using Latitude, Longitude and Elevation as units, it is a system to enable positioning and locating points on Earth's surface by a set of values.
- Geographic PhenomenaAn occurance observed in nature (e.g., trees, hills, rivers, etc…).
- Geographically Weighted RegressionGeographically weighted regression is a local modelling technique used to generates parameters disaggregated by the spatial units of analysis.
- GeoidA model of global mean sea level,used to measure precise surface elevations.
- Geoid UndulationThe distance between the mean sea leavel and the heitht provided by WGS84 coordinate system, which used the ellipsoid as reference.
- Geoidal HeightDifference between Geodetic Height and Orthometric Height.
- GEOINTGeospatial Intelligence
- Geological StructuresA result from tectonic forces that causes rocks to fold and break, forming mountains, valleys and faults.