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How to add the new OSTN02 NTV2 Transformation to ArcReader 10.0

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03-15-2011 11:50 AM
JimSibbald
by Esri Contributor
Esri Contributor
‎03-15-2011 11:50 AM
Ordnance Survey working with Defence Geographic Centre have produced an NTV2 version of their OSTN02 transformation. Information about the transformation and the NTV2 file itself can be found at http://www.ordnancesurvey.co.uk/oswebsite/gps/osnetfreeservices/furtherinfo/ostn02_ntv2.html

The attached PDF shows how to add this to ArcGIS Desktop 10.0 but it is the same process for ArcReader. I have also included my GEOGTRAN file which needs the .txt extension removed to work. Enjoy!
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GEOGTRAN.txt.zip
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2 Replies
JimSibbald
by Esri Contributor
Esri Contributor
‎06-01-2011 01:47 AM
With the OSTN02 NTv2 Transformation being adopted by EPSG, I have changed the names of the transformations to reflect those of EPSG.  The CUSTOM transformation code must be in the range 208000 and so I have ensured that they reflect the EPSG code of 5338 and 5339 by using 208338 and 208339 respectively.


http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:coordinateOperation:EPSG::...

http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:coordinateOperation:EPSG::...


New GEOGTRAN file attached.
GEOGTRAN.txt.zip
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by Anonymous User
Not applicable
‎08-22-2011 02:46 AM
Original User: abdb2

Thanks for posting this - potentially very useful.  I put this into ArcGIS 9.3.1 and it seems to work fine but on transforming some sample points from BNG to WGS84 in Scotland using the OSGB_1936_To_WGS_1984_7 transform and the 'Project' tool they seem about 70m out from the lat/longs given by OS GridInQuest which is strange (as both should be using OSTN02).  The 'Petroleum' transform is about 5m out.
I realise you are not in a position to provide support but if any thoughts come immediately to mind on why this should be I'd be interested to hear.

Cheers
Duncan
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