Local Tie Technical Report 9 Summary

The local tie survey at the Mt Stromlo Satellite Laser Ranging (SLR) station was initially performed in June 1999. This survey was completed for the purpose of determining the connection between the SLR reference point and the Global Positioning System (GPS) reference point. It also determined the relationship between the SLR reference point (the telescope invariant point), the four SLR calibration pillars and the surrounding survey monuments. Monuments were connected to include the fundamental survey pillar (AU045), the west pillar (AU054), Mt Stromlo Trig (the original geodetic survey mark) and benchmark SR1526. The results from this survey can be found in Geodetic Technical Report number 3 at www.ga.gov.au/geodesy/reports/localties/

A Leica TC2003 total station was used for all horizontal angles, slope distances and zenith angles. Where zenith angles were used for heightening, the Rueger method was used to determine the height of the trunnion axis of the total station above the station mark. Simplistically, the Rueger method consists of observing a levelling staff over a known point with the vertical circle of the total station set to 90 degrees (horizontal). Using the known height differences of the two survey marks and the observed staff reading, a height of instrument can be easily and accurately derived.

• See the complete Technical Report 9 [PDF_256k]

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