Pitney Bowes MapXtreme User Manual
Page 587
Appendix H: Elements of a Coordinate System
National Transformation v. 2 (NTv2)
MapXtreme v7.1
594
Developer Guide
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New Zealand
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Germany
These files are located in the MapXtreme Common Files folder. The default location of this file is:
C:\Program Files\Common Files\MapInfo\MapXtreme\7.0.0
In addition to the algorithm and grid shift files, an XML configuration file, NTv2.xml, has been
installed to enable you to extend the NTv2 algorithm to support additional datum transformations.
You can add new grid shift files to the configuration file, or you can turn the NTv2 algorithm on or off
for particular grid shift files. The NTv2.xml file is located in the MapXtreme Common Files folder.
The NTv2 algorithm and grid shift files for Canada are protected under the following copyright:
© 1995 Her Majesty the Queen in Right of Canada, represented by the Minister of Natural
Resources.
The next sections describe the supported transformations for each country and how to use the
configuration file.
Canada
The following grid shift files are included for Canada:
NTV2_0.GSB–used for converting NAD 1927 to NAD 1983
MAY76V20.GSB–used for converting NAD 1927 (Definition 1976) to NAD 1983 for Ontario
These files convert between the NAD 1927 or NAD 1927 (Definition 1976) datums and the NAD
1983 datum. The NAD 1927 datum (Definition 1976) coordinate system is a readjustment of NAD
1927 for Ontario.
Detailed information about the algorithm, software, and grid shift files can be downloaded from the
Geodetic Survey Division of Geomatics Canada web site:
Australia
The following grid shift files are included for Australia:
A66_National.gsb–used for converting AGD 1966 to GDA94.
National_84.gsb–used for converting AGD 1984 to GDA94
The Australian grid shift files convert between either the AGD 1966 or AGD 1984 datums and the
GDA 1994 datum.
Detailed information about conversion and grid shift files can be downloaded from the
Intergovernmental Committee on Surveying and Mapping (ICSM) web site:
New Zealand
The following grid shift file is included for New Zealand:
nzgd2kgrid0005.gsb–used for converting the NZGD49 datum to the NZGD2000 datum.