GRB

AJAX progress indicator
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  • p

  • Prismoidal Rule
    Rule for calculating volume within a prismoid.
  • PRN Codes
    PseudoRandom Noise Code
  • Probability Density Function
    Computing the probability of the pixel value belonging to each category for unidentified pixel classification.
  • Probability Distribution
    See description on Binomial Distribution.
  • Probing
    Manual (and/or mechanically/hydraulically assisted) investigation of subsurface materials.
  • Process Model
    Predictive and Dynamic model for integrating knowledge of existing environmental processes with equations for quantifying these processes.
  • Professional Knowledge
    Professional, technical and systematic knowledge in a specified area, differing from general knowledge which has no specific characteristics and skillsets.
  • Professional Liability
    Legal obligation rising from the professionals' action (or inaction).
  • Proficient
    Extremely familiar with the knowledge and able to operate equipment and software without instructions
  • Program Evaluation and Review Technique
    Project management tool to evaluate and visualize project paths and critical paths.
  • Progressive Sampling
    A analysis approach that starting with a small sample of data and increasing the size progressively until the accuracy cannot be improved.
  • Projected Coordinates
    Measurement of location expressed in 2D system, which is based on a geographic coordinate system.
  • Projection Aspect
    The relationship of the placement of the developable surface (projection) and the Earth's surface.
  • Projections
    Presentation of an image and/or object onto another medium, generally of another order (e.g., 3D image onto 2D map) or system (e.g. onto a coordinate system).
  • Projective Transformation
    Transformation of coordiates digitized directly from aerial photographs of terrain, assuming there is no distortion on the photographs.
  • Prompt Correlator
    Correlator used for tracking phase and correlation peak of signal, it is when the replica signal generated from the receiver aligns perfectly with the incoming signal.
  • Propagation Delay
    Elapse time between when the signal was transmitted and when the signal was received, a measurement for length in GPS surveying.
  • Property
    Attribute/characteristic of an Object.
  • Proportional Symbol Mapping
    Scaling the size of geometric symbols proportionally to the data value at a particular location.
  • Prototyping
    Building of a product for test of concept/process, an early release to try out design.
  • Proximity
    Spatial query of features based on distance from of selected feature.
  • Proximity Analysis
    An analytical technique used to determine the relationship between a selected point and its neighbors
  • PRS Code
    Public Regulated Service Code
  • PSD
    Power Spectrum Diagrams
  • Pseudo Node
    Where two line features share the same end point, can be a node with no reason for existence as line features share the same value.
  • Pseudocolour
    Colour rendering techinique used to display images in false colours to analyze/eccentuate certain features/phenomena.
  • Pseudoconical Projection
    Map Projection with equal-area properties with parallels at equal spaced arcs centered on a Pole. Type: 1) Bonne Projection 2) Werner Cordiform
  • Pseudocylindrical Projection
    Map projection where central meridian is represented as a straight line and other meridians are longer, bowing outwards from central meridian. Type: 1) Sinusoidal Projection 2) Goode Homolosine Projection 3) Eckert Projection 4) Mollweide Projection
  • Pseudokinematic Positioning
    Combination of Static and Kinematic methods, where one reciever is kept at a known station whilst another moves to survey other stations, similar to Stop-and-Go positioning/survey but the loss of satellite lock is permissible during the transportation of roving stations between points/stations.
  • Pseudolite
    Ground-based differential GPS receiver that transmits signals similar to GPS satellites, can be used for ranging and feasible in circumstances where no satellite signals are observable.
  • Pseudorandom Noise Code
    Binary signals with noise-like qualities modulated on GPS carrier waves, they are elemtns of the CDMA based satellite navigation system.
  • Pseudorange
    Pseudo distance between satellite and reciever based on tiem measurements.
  • Pseudorange Code
    Observables within GPS, code modulated on the carrier.
  • Pseudoscopic Effect
    Optical illusion where a hill can look like a valley due to projection of shadows.
  • Pseudostatic Positioning
    See definition on Pseudokinemtaic Positioning/Survey.
  • PSI
    Pound Per Square Inch
  • PTW
    Permit-To-Work
  • Push-broom Scanning
    Scaaners record multispectral image data along a swath beneath an aircraft.
  • Pyramiding
    Tehnique for building layers of rasters for display, resampling is required for building a pyramid.
  • Pythagoras Theorem
    A relation in Euclidean geometry among the three sides of a right triangle,a2 + b2 = c2 ,where c represents the length of the hypotenuse and a,b represent the lengths of the triangle's other two sides.
  • PZ-90
    Coordinate system used by GLONASS satellite network.
  • PZS Triangle
    Pole-zenith-star triangle, a spherical triangle which lies on the celestial sphere and its vertices are the pole, the zenith, and thecelestial body involved.
  • q

  • QA
    Quality Assurance
  • QC
    Quality Control
  • QPSK
    Quad Phase Shift Key
  • QQ Plots
    Graphical method for displaying probability distribution of two datasets, allows comparison of data collection and/or theoretical distribution.
  • Quad Phase Shift Key
    Modulation scheme, where phases of the carrier wave is modulated to encode bits of data (two bits per symbol) in each phase change.
  • Quad Tree
    Structure of dividing raster into quadrants, continuous division of raster into quadrant until it is reduced to a single-cell level (node).
  • Quadrangles
    A flat shape with four straight sides and each vertices of four are connected by the straight line.
  • Quadrantal Bearing
    Type of Bearing, defined as an angle between 0ᵒ to 90ᵒ from North/South direction (line of reference/reference meridian).