First Geodetic Survey Station National Historic Site of Canada

First Geodetic Survey Station was designated a national historic site of Canada in 1929. It is recognized because:

• it was here that commenced the triangulation system of the Geodetic Survey of Canada, the basis of surveys for all purposes, topographical, engineering, and cadastral.

Geodesy is the scientific discipline that deals with the measurement and representation of the dimensions and shape of the Earth. When a network of geodetic points is established by “triangulation,” it is possible to define the geometric structure of the Earth by measuring triangular elements. These geodetic points are copper bolts, often located on mountaintops to ensure intervisibility over distances of up to several tens of kilometres.

In 1888, the Association of Dominion Land Surveyors increased activities aimed at setting up a geodetic service in Canada. After years of research by Director William Frederick King and others, the first geodetic surveys were carried out in Canada, beginning in June 1905 at Kingsmere, in the National Capital Region. The first geodetic point (or geodetic station), named King MTN, was installed approximately 14 kilometres from Ottawa. The point was selected because it is the most visible from the federal observatory at the Central Experimental Farm. This geodetic point would not be long used because its visibility is unsatisfactory. A second point, called an “eccentric station” was selected in September 1909. This second point is located at an elevation 64 metres (211 feet) lower than the original station, and it became the point of reference. It is located at 45º 29' 20.56787" N, 75º 51' 45.26354" W.