[Qgis-user] Projection / Custom CRS help [SEC=UNCLASSIFIED]

[Bruce Bannerman]

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 <qgis-user-bounces at lists.osgeo.org> on behalf of Phil (The Geek) Wyatt <phil at wyatt-family.com>
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:qgis-user-bounces at lists.osgeo.org] 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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