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  • f

  • Field
    Part of database structure, location within table (column) for storage of attribute to a feature.
  • Field of Study
    Branch of knowledge taught and researched.
  • Field of View
    The angular size of the cone in space which the sensor can detect.
  • Field Verification Data
    Reference data.
  • Figure-Ground Relationship
    Perception of importance between objects (figure) to background (ground).
  • File Structure
    Organization of files, can be refered as file format.
  • Filled DEM
    DEM without depression/sinks.
  • Filter
    Instrument to block a certain type of light(e.g. blue light) and let other light(e.g. infrared light) pass through to the camera.
  • Filter Factor
    To express the number of times by which an exposure should be increased to compensate for radiation absorption for a provided filter.
  • Finite Difference Frequency Domain
    Method of modelling for electromagnetic-based problems similar to FDTD, based on the discritization of computational space into 2D squares or 3D cubes.
  • Finite-Difference Time Domain
    Modelling technique for signal processing of electormagnetic wave propagation problems.
  • Fishnet Map
    Wireframe diagram depicting surfaces.
  • Fix
    Vessel position at a particular instance.
  • Fixed Solution
    Where ambiguity parameters are fixed at integer values, with positioning accuracies at centimeter level (integer value levels).
  • Flagging
    Technique to mark location/station.
  • Flat File Database
    Database without structure or structural relationships, where all data are stored within a single file.
  • Flattening Ratio
    Measure of compression of circle/sphere along a diameter to form an ellipse/ellipsoid.
  • Flight Line
    The aircraft's flight path, to produce a succession of overlapping photo of complete coverage of the area.
  • Flight Planning
    For better interpretation and ideal aerial photography, flight planning need to take some parameters into consideration,liek the focal length of the camera, the film format size, the photo scale, the coverage area, the average elevation,the desired overlapping and teh gournd speed of the aircraft.
  • FLIR
    Forward-Looking Infrared System
  • Float Line Method
    A means for horizontal fixing, where parallel lines run perpendicular from baseline, with known coordinates and heights on end points, on the coast.
  • Float Solution
    Where ambiguity parameters could not be fixed at integer values, with positioning accuracies are at decimeter or submeter level.
  • Floating Mark Principle
    Floating mark is used to conduct quantitative measurements on stereo photographs. To shift the relative positions of the half marks,the left mark and the right mark, along the flight line until they visually fuse together and form a single mark which ""float"" in teh stereomodel.
  • Floating-Point Numbers
    Where there are no fixed number of digits before or after decimal point.
  • Floating-Point Rasters
    Raster containing cells of continuous values.
  • Flora and Fauna
    Plants and animals.
  • Flow Accumulation Raster
    Raster composed of cells with values specifying the number of cell that flows into it.
  • Flow Control
    Process of managing rate of data transmission.
  • Flow Conveyance
    Movement/transportation of liquid.
  • Flow Direction Raster
    Raster showing direction of water flow between cells.
  • FMCW
    Frequency Modulated Continuous Wave
  • FOC
    Full Operational Capability
  • Focal Length
    The distance from a lens to its focus.
  • Focus
    A point of convergence of light rays
  • Foreign Key
    Used to ensure integrity of data and for table joining, they are attributes that can uniquely identify an entry/record in the table, it may be referred to Primary Key in the join table.
  • Foresight
    Final observed height measurement on the level run in a single setup.
  • Formwork
    Temporary moldings/structures for materials to be set into (e.g. pouring of concrete).
  • Forward-Looking Infrared System
    Forward-looking infrared system, used to votain oblique views of the landscape in front of an aircraft with the similar principles of an across-track line scanning system.
  • Fourier Analysis
    An expression of waveform as a series of sinusoidal functions.
  • Fourier Spectrum
    A two-dimensional scatter plot resulting from Fourier transform.
  • FOV
    Field of View
  • Fractional Initial Phase
    Occurs at the receiver at the first instant of the lock-on, when it starts tracking the incoming phase from the satellite.
  • Frame Buffer
    Portion of RAM containing bitmap for the display of image so that the image can be displayed on screen from memory.
  • Free Network Adjustment
    Adjustment on overall geometry of network, to test for quality of network and identify blunders.
  • Free-space Transmission Loss
    Loss of power in radio waves due to geometric spreading.
  • Frequency
    Wave Property. Measured in Hertz (Hz), it measures how many cycles are completed within one second.
  • Frequency Curve
    A smooth curve indicates the limiting case of a histogram computed for a frequency distribution of a continuous distribution when the number of data points becomes very large.
  • Frequency Division Multiple Access
    Channel access technique using multiple access protocols, common for satellite communication.
  • Frequency Harmonic
    Component frequency of signal, the integer multiple of the fundamental frequency.
  • Frequency Modulated Continuous Wave
    A Radar system where radio signals are modulated to adjust bandwidth and range resolution.