“Valid” Coordinates

Coordinates, and operations on coordinates, are characterized as being of three types:

• Exact, in which the coordinate falls within the well-defined extents of a SRF
• Extended, in which the coordinate falls outside of the well-defined extents of a SRF, but falls within a well-defined “extended bound” for which GDT errors have been well-defined
  • Extended coordinates are supported by the SRM implementation, however a warning will be issued each time one is input or output
• Invalid, in which the coordinate falls outside of the “extended bound”
  • Invalid coordinates will not be supported by the SRM “checked” implementation – either as input coordinates or as output coordinates. The exact extents of invalid are specified for each SRF

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