Abstract
The Canadian Trilateration Survey, initiated in 1949 and completed in 1957, covers an area of 2,500,000 square miles. The Shoran net consists of 143 stations (18 fixed) with 502 measured interlacing lines, of which the longest is 367 miles. Through the Shoran trilateration Canada now has a complete coverage of the area north of the present triangulation system. The Arctic islands are integrated with the mainland, and all results are upon a uniform datum. The standard of accuracy in length is assessed as 1 in 56,000, and this value has been confirmed by a limited number of Shoran stations since incorporated in the triangulation net. Variations in position of some magnitude are bound to be revealed, because, although length is maintained on the average to a high degree, random mismeasurement does occur and has remained undetected during the operation. The effect of mispositioning a station is to introduce a local twist or swing in the net, and this, in turn, is imposed on the succeeding work. Owing to the location of the 18 basic triangulation stations, the distortion in position cannot be removed now, but it cannot exceed certain limits because of the confinement of the work by these stations. An improvement in positioning and general accuracy will be obtained through the projection of firstorder triangulation northward, and the geodetic value of the trilateration will then be correspondingly increased.
Published Version
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