Which grid shift files are included with FME?

FME supports conversions between coordinate systems using different datums. Many datum transformations are not mathematically definable and require the use of a grid of shifts. If you attempt to make a datum transformation of this kind without the appropriate grid shift file in place, FME will abort the translation. (In older versions of FME, the translation would continue but the FME log file would alert you that the transformation was not done correctly.)

NOTE: The downloaded versions of FME do not include many of the grid shift files.

Installing FME from the CD will ensure that the grid shift files provided by Safe Software are installed in the correct location.

If you install FME from the CD:

If you install FME from the CD, Safe Software automatically installs grid shift files for the following datum transformations:

AGD66 <-> GDA94 (Australia)

AGD84 <-> GDA94 (Australia)

ED50 <-> ETRF89 (Spain)

NAD27 <-> NAD83 (Canada)

NAD27 <-> NAD83 (USA)

Note: Adding support for NAD83 <-> NAD27 Datum Shifts: When you install FME, one of the installation panels determines which NAD83 <-> NAD27 datum shifts will take precedence in FME. If you choose "Yes" FME will give precedence to the Canadian method in areas near the Canada-U.S. border. If you choose "No" FME will give precedence to the U.S. (NADCON) method in areas near the Canada-U.S. border. You can always change the precedence of these files later; for example, if you work with both Canadian and U.S. data. See Maintaining Grid Shift Files.

NTF <-> RGF93 (France)

NZGD49 <-> NZGD2K (New Zealand)

OSGB <-> OSTN97 (Great Britain)

To use the OSTN97transformation if you are running a downloaded version of FME, you will have to obtain the OSTN97.TXT data file from the Ordnance Survey and place it in the FME Reproject directory. If you have installed FME from the CD, the OSTN97.TXT file will already be included in the FME Reproject directory.

Users should not normally have to use this projection to define their own systems FME ships with the OSGB-GPS coordinate system, which is based on this projection. For further information, visit:

http://www.ps.ucl.ac.uk/fig5_5/FIGLocalInfoSheetUK.htm

OSGB <-> OSTN02 (Great Britain)

To use the OSTN02transformation if you are running a beta version of FME, you will have to obtain the OSTN02_OSGM02_GB.txt  data file from the Ordnance Survey and place it in the FME Reproject directory. If you install from  a current release of the FME CD, the OSTN97.TXT file will already be included in the FME Reproject directory.

Users should not normally have to use this projection to define their own systems FME ships with the OSGB-GPS-2002 coordinate system, which is based on this projection.

 

Which OSTN shift files does FME include?

These text files will be included in the FME Reproject directory when you install FME from CD:

OSTN02

To use the OSTN02transformation if you are running a beta version of FME, you will have to obtain the OSTN02_OSGM02_GB.txt  data file from the Ordnance Survey and place it in the FME Reproject directory. If you install from  a current release of the FME CD, the OSTN97.TXT file will already be included in the FME Reproject directory.

Users should not normally have to use this projection to define their own systems FME ships with the OSGB-GPS-2002 coordinate system, which is based on this projection.

OSTN97

To use the OSTN97transformation if you are running a downloaded version of FME, you will have to obtain the OSTN97.TXT data file from the Ordnance Survey and place it in the FME Reproject directory. If you have installed FME from the CD, the OSTN97.TXT file will already be included in the FME Reproject directory.

Users should not normally have to use this projection to define their own systems FME ships with the OSGB-GPS coordinate system, which is based on this projection. For further information, visit:

http://www.ps.ucl.ac.uk/fig5_5/FIGLocalInfoSheetUK.htm

 

 

If you installed a beta or downloaded version of FME, you can add these files with the Grid Shift File Installer available on the Datum Transformations and Grid Shift Files page on our website.

If you download FME from Safe Software's website or ftp site:

If you download and install FME, Safe Software provides grid shift files for the following datum transformations:

If your translation is failing or producing warnings because of missing grid shift files, you can install many of them using the Grid Shift File Installer available on the Datum Transformations and Grid Shift Files page on our website. This installer runs automatically if you install FME from CD.

Which files do you have to obtain separately?

Safe Software cannot provide grid shift files for the transformations listed below. In these cases, is it necessary to contact the appropriate jurisdiction to obtain the required files.

For detailed information on most of these files, select Tools > Browse Coordinate Systems, and press the F1 key.

USE Data Transformation Approximations

For more information on individual grid shift files, see USE Data Transformation Approximations.