All questions relate to a geodetic study of Rland, a fictitious island. Rland is thought to be a geologically stable land mass in that there are no significant faults causing deformation between survey marks. However, the entire land mass is free to rotate and subside. Consider the geology as being similar to that of Barbados.
Problems relate to a geodetic study of Rland concerning developments of geodesy for surveying and mapping in the modern satellite era. Questions 1 to 4 require an investigation of the existing geodetic network for horizontal control in relation to modern datums while Questions 5 and 6 relate to vertical control.
QUESTION 4 [20 marks]
- On the basis of findings from the geodetic study, and from your understanding of modern geodesy, provide the government of Rland with advice on establishment of a new horizontal datum. Such advice should consider factors such as:
- Internal deformation of the network and movement of the network in ITRF
- Datum definition and realization.
- Surveyors working with traditional equipment and those tying GPS data to ITRF.
- Future operations when ITRF2014 is superseded.
The response may be in point form and must include justification for each point given.
- Comment on the applicability of the existing national map grid for mapping spatial data on the new datum and if it is not considered suitable then provide an alternative option.