File:Moreton Bay, Survey Baseline, Robert Dixon, 1839 map.svg
Original file (SVG file, nominally 1,052 × 744 pixels, file size: 443 KB)
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Summary
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| Description |
English: A map showing the location of the baseline for the trigonometrical survey of Moreton Bay, Queensland, led by Robert Dixon which began in 1839. The baseline was measured on what was named Normanby Plains, now known as Harrisville which is 20km south of Ipswich and lies near Warrill Creek. This survey led to the first accurate map of the region. (Datum: WGS 84) Landmarks in the region, such as the two peaks shown, were selected as trig points to create a network of triangles. Triangulation of the network from the 3 mile baseline with the angles measured between the trig points was calculated using the law of sines and logarithm tables. The surveyors also employed celestial observations, including lunar distances, tying the survey to latitude and longitude and as check on accuracy. This control network provided a framework for larger scale surveys and maps. |
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| Source |
Own work Base map derived from: GEODATA TOPO 250K Series 3 (Geoscience Australia, Creative Commons — Attribution 3.0 Australia) Historical features derived from: Copy of a despatch from Sir G. Gipps, Governor of New South Wales, to the Secretary of State for the Colonies, transmitting a report of the progressive discovery and occupation of that colony during the period of his administration of the government (1841), A trigonometrical survey of the country at Moreton Bay, by Robert Dixon, pp. 35-36 |
| Author | Brass razoo |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:12, 24 September 2013 | | 1,052 × 744 (443 KB) | Brass razoo (talk | contribs) | include network between baseline and 2 primary trig stations |
| 01:10, 24 August 2013 |  | 1,052 × 744 (431 KB) | Brass razoo (talk | contribs) | User created page with UploadWizard |
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