This article relates to datum information that is required to be included in a CSD under rule 9.2.
Horizontal datum information
A CSD Plan must identify the horizontal datum and projection used [r 9.2(a)].
No reference is required in a CSD to coordinate values or an origin of horizontal coordinates.
Vertical datum information
Where a reduced level is used to mathematically describe a stratum boundary, the CSD Plan must include the vertical datum [r 9.2(b)].
Where a reduced level is used, the CSD must include information on the origin of the heights [r 8.1(f)].
- height datum
- heighted non-boundary marks with their reduced levels (they may have been noted as bench marks)
- reduced levels of the stratum boundary.