Hi Matt, It is possible that the data is based on the Australian National Grid using Clarke 1858. See:
http://www.ga.gov.au/scientific-topics/positioning-navigation/geodesy/geodetic-datums/historical-datums-of-australia/australian-national-grid Bruce ________________________________ From: Qgis-user <[email protected]> on behalf of Phil (The Geek) Wyatt <[email protected]> Sent: Monday, 9 May 2016 4:01:01 PM To: 'Matt Boyd'; 'qgis-user' Subject: Re: [Qgis-user] Projection / Custom CRS help Here is a good place to start for information on older datums. http://www.ga.gov.au/scientific-topics/positioning-navigation/geodesy/geodetic-datums/historical-datums-of-australia/australian-map-grid http://www.ga.gov.au/scientific-topics/positioning-navigation/geodesy/geodetic-datums/historical-datums-of-australia But I would be trying AGD66 first as the most likely contender at that time. Cheers - Phil From: Qgis-user [mailto:[email protected]] On Behalf Of Matt Boyd Sent: Monday, 9 May 2016 2:07 PM To: qgis-user Subject: [Qgis-user] Projection / Custom CRS help Hi QGISer's, I've got some data acquired in Australia in 1967. The acquisition reports mention a false easting and northing and a TM projection. I'm assuming TM means Transverse Mercator. It's early 1967 data and doesn't mention AGD66 anywhere. However a some of the reference docs mention measurements in yards and feet. All of the historical analysis of the data that I can find dates back to the early 1980's and late 1970's and these all assume AGD66. I would like to be able to create a custom CRS that I can load the original data into (or a smaller portion of it) to confirm that the data has been transformed over the years correctly. Is anyone familiar with pre-AGD66 projections in Australia and any idea how I'd go down this road? Thanks Matt
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