[Qgis-user] OT: IRTF to GDA94 difference [SEC=UNCLASSIFIED]

[Bruce Bannerman]

Hi Matt,

>From a recent presentation from the Australian Intergovernmental Committee on Surveying and Mapping [1]:


“Absolute difference between GDA94 and ITRF will exceed 1.8 metres by 2020”


This presentation was referring to a proposed dynamic datum: GDA2020 (which will raise a wide range of challenging data management issues).

I suggest following up with ICSM for an authoritative answer.

Bruce

[1] http://www.icsm.gov.au/publications/PCG-SSSC_2013_Canberra.pdf



From: Matt Boyd <mattslists at gmail.com<mailto:mattslists at gmail.com>>
Date: Tuesday, 30 September 2014 14:17
To: qgis-user <qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>>
Subject: [Qgis-user] OT: IRTF to GDA94 difference

Hi fellow QGIS people,
I'd like an easy (as in if it's too hard I probably won't have time to do it) way to confirm the drift on GDA94 compared to UTM. I've done a little digging and haven't been able to find anything except "Australia is moving approximately NE at a rate of 7cm per year and in 2005 it was 77cm". Having said that, I'm a little hazy on if UTM is the worldwide reference and how it's related to IRTF.

Is there anywhere online that works this out automatically?

Thanks
Matt
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