I observe sets of angles and distances on a Leica TCA2003, store them as GSI. Residuals are computed for every observation. The beauty of RDE is that you can enter every vertical distance, slope distance and horizontal distance, not just an average. I often have over 20 setups each with four sets to as many as 15 target stations up to 1000 m distant with a height range of up to 100 m. Terramodel is able to handle large complex networks. RDE Least Squares Adjustment interacts between raw data, residuals and computed positions, and has an excellent report tool. I was reasonably proficient in Terramodel from managing 600 km of railway construction survey in Thailand but it wasn’t until my current appointment in 2004 that I harnessed the power of one of Terramodel’s less well understood options, RDE Least Squares Adjustment.Īs Project Surveyor of the Dam Safety Branch, I am responsible for dam wall movement monitoring for the 23 dams of the Sydney Catchment Authority.Īt each dam, I observe local but dense 3D networks of angles and distances to check surrounding control pillars and on-dam marks to better than 2mm within 95% confidence.
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