The national transformation for converting between NAD27 and NAD83 in Canada

The National Transformation to convert coordinate data between the NAD27 and NAD83 reference systems in Canada is described in this paper. Background concerning many complex processes and the data used to model the differences between the two systems is provided, with some analysis of the accuracy. The resulting model is implemented by means of a simple, automated software package to enable most users to handle their own data conversion processing. Suitability of the National Transformation for various applications is also discussed.

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