Reference datum (RD)

• Concept

  • A construct with position-space analytic representation and object-space geometric representation
  • Category:
    • Point
    • Directed curve
    • Oriented surface
  • Expressed as implicit or explicit function of position-space
  • Method of orientation (except point)
  • Method of binding to object is application domain specific and is outside of SRM scope

• Standardized set

  • Label, code, definition
  • set of Ellipsoid RD associated to celestial objects

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