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GIS I - GROUP D (Possible Field Types (float-single precision floating…

- - - - strict connectivity
      - recording adjacency
      - recording planarity
- - - - Nodes
      - Vertices
      - Arcs
- - - - Digital Elevation/Digital Terrain Model
  - - - OID
      - Value
      - Count:
    - - Examples include temperature, rainfall, elevation, etc
      - Reffered to as a field or surface data
- - - - secant=two lines of tangency
      - tangent=one line of tangency
      - line of tangency=line of true scale=no distortion
    - - conic
        
        Perspective Conic, Lambert conformal
      - cylindrical
        
        Mercator
      - planar
        
        Orthographic
    - - shape
      - area
      - direction
      - distance
    - - transverse: axis parallel to equator (e.g. transverse mercator)
      - oblique: other angle
      - equatorial: axis parallel to earth's rotation axis
    - - Transverse Mercator
      - Lambert conformal conic
  - - - Fused
      - Simplified
      - Displaced
      - Omitted
      - Exaggerated
  - - - On-screen
      - Hardcopy
        
        Optical Scanning
- - - - Carrier signals
        
        more accurate
        
        require more expensive receivers
        
        Two signals on different frequencies
        
        L1
        carries both P and C/A
        
        L2
        carries P only
        
        signal must be measured for longer
      - coded signals (pseudorandom noise, PRN)
        
        C/A
        
        P
      - almanac + ephemeris data?
  - - - range distance of 4 satellites = one possible location for receiver
    - - atmospheric conditions
      - multipath signals
        *due to interference from nearby objects
      - arrangement of satellites; positional dilution of precision
  - - - satellite segment
        
        21+ satellites
        
        6 orbital planes
        
        12 hour orbital period
        
        at least 4 visible at any given time
      - control segment
        
        Master Control Station in Colorado
        
        five tracking stations worldwide
- - - - edges
      - faces
      - points
- - - - Near infrared represented as red, blue as green, and green as blue
  - - - LIDAR
      - Orthophotography
      - RADAR
      - SONAR
    - - LIDAR
      - LANDSAT
- - - - X,Y & Z values of the origin
      - orientation angle for each of the three axes
      - a & b: defines the size/shape