2011

GDC FileGrid Data File (GSB)TransformationArea
Nzgd49ToNzgd2K.gdcnzgd2kgrid9911.gsbNew ZealandNew Zealand
For more information about Australia and New Zealand coordinate systems,
go to http://www.ga.gov.au.
See also:
■
Australian Datum Transformation and Coordinate System Changes (page
110)
■
Datum Shift Issues for North American Users (page 112)
■ Coordinate System Files (page 113)
■ Overview of Grid Data Files and Datum Shift Issues (page 103)
■ Grid Data Files for the United States (page 105)
To set up a new grid data file for Australia or New Zealand
1 When you obtain a new grid data file, copy it into the appropriate folder
under the Autodesk shared coordinate system folder, by default
C:\Documents and Settings\All Users\Application Data\Autodesk\Geospatial
Coordinate Systems.
2 Open the appropriate GDC file in any text editor or word processor that
can produce an ASCII file, such as Notepad or Wordpad.
NOTE Back up GDC files before you edit them, so you can restore them to
their previous state, if necessary.
3 Edit the file to point to the name and location of your new grid data file.
4 Make other changes needed, such as rearranging or replacing grid data
files, changing the fallback datum (page 2059) definition, or adding
comments.
Australian Datum Transformation and Coordinate System
Changes
The Geocentric Datum of Australia (GDA) is the new Australian coordinate
system, replacing the Australian Geodetic Datum (AGD). GDA is part of a
110 | Chapter 2 Setting Up