Survey of New Brunswick
This transformation is an executable module within the application NBGeocalc. It is an adaptation of the ESTPM program developed by Geodetic Survey of Canada.
The transformation makes use of a residual file for each Canadian maritime province. The process of residual interpolation accounts for local variations in the coordinate reference system and provides a transformation accuracy of +/- 5 cm. By using a second residual file, the transformation may be reversed. Only one residual file is in use by the method during any given execution.