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Forrest Geodetic / Lake Moore Baseline


The project will perform a re-survey of the Lake Moore baseline.The area itself was first explored around 1846 to find areas suitable for farming and pastoral land. The baseline itself along with SSM’s were established after John Forrest explored the area in 1869 and found that Mount Singleton was suitable for a major survey mark.

A baseline was established on the lake and was used to create a network using the method of triangulation, the distance along the baseline was chained during that time and every few years we need to re-observe the baseline because in time the points may move due to geological processes and need to be re-calibrated.




  • To re-observe the triangulation network at Lake Moore using the original baseline and re-calculate the coordinates of each of the existing stations in the triangulation network.

  • Compare the results of this new survey to the original survey conducted between 1869 and 1900.

  • Establish connections to existing survey stations using GPS and Total stations.

  • Research the history of the area and determine the historical importance of the Lake Moore baseline.

  • Determine how the existing baseline can be used to establish an accurate SSM network for this area.

  • Determine the importance of this baseline in relation to the existing pastoral lease boundary.

  • Research the impact of native title on this area and how it helps protect this historical area.




  • Research the history of the area

  • Acquire search for the area (DP’s, Field Books).

  • Establish coordinate list from the given SSM’s in the area.

  • Use coordinate list with GPS to find existing marks.

  • Transform geodetic coordinates (Latitude, Longitude) to MGA Coordinates

  • Re-establish Baseline and Network using the method of triangulation with contempory surveying equipment such as current GPS and Total Stations.

  • Compute the triangulation network using trigonometry.

  • Use Least squares software to adjust coordinates.

  • Compare measurements and results with existing data.

  • Prepare a full report on what was done and how it was done

  • Prepare presentation on the lake Moore Baseline

Some History


In the period of 1874 to 1880 Alexander Forrest and John Forrest took teams to explore and map the area of Western Australia we call the Murchison. The area is known for its high mountains and rock plateaus, which made some areas the perfect place to establish trigonometric stations. Alexander Forrest took the first expedition in 1871 and began surveying the area at Tinderlong Hill and its surrounding areas where the Shire of Yalgoo and the Shire of Mullewa are today. The area covered includes Yuan Station, Woolgorong Station, and Gabyon Station where many of the trigonometric stations had been established.


Forrest Trig Report

Jeremy McEntee
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