Government surveyors conduct surveys for the Investigation Survey Plans series from 1986-1988. They covered many suburbs in the Canberra Central District. The purposes of these surveys were:
- to connect the survey control network (CRMs and SRs) into the cadastre,
- to resolve cadastral definition issues in known problem areas, and
- to upgrade the digital cadastral database to SG/AG coordinates.
The information on the Investigation Survey Plans series helps to find cadastral reference marks. Use extreme care when using these plans to redefine the cadastre, because:
- they're based on the survey control mark network azimuth that uses SG/AG coordinates. Whereas the Canberra Central District uses radial survey coordinates based on the original radial survey. These aren't mathematically compatible and have small differences in orientation and adjustments,
- not all reference marks and cadastral monuments were found during the surveys, and
- the series Investigation Survey Plans did not undergo plan examination.
Example: INV C20900-60450
