topic Re: Transformation Parameters for ITRF 2008 - GDA94 in ArcPad Questions

Transformation Parameters for ITRF 2008 - GDA94

GeorgeRoss — Sun, 05 Aug 2012 04:00:07 GMT

Hi
As some sort of introduction I'm a geologist in Australia who works for junior exploration company.
Our company has a Hemisphere R320 DGPS that receives the Omnistar corrected signal, we use Arcpad loaded on Nautiz X7 PDA as an interface. I have been playing around with the device and checking it against known official base survey points within the local area.

I have a project with GDA94 MGA54 as the set projection and all my data files are also in this format. When I use the dgps to pickup known survey locations these are generally offset approximately 70cm east and 125cm north from the recorded locations (I have checked multiple datum points and the error is relatively consistent). I think the issue is that Arcpad is receiving lats and longs in ITRF2008 from the DGPS and there are no correct transformation parameters set. I have fiddled around with the datum configuration tool using the parameters documented in www.ga.gov.au/image_cache/GA19050.pdf however just cannot seem to get things to work!

I have spent several days trying to fix this to no avail!

Does anyone have the correct transformation file for ITRF2008 -> GDA94 or have any further suggestions??

Thankyou!

To fix this issue I have been trying to work out the best way to

Re: Transformation Parameters for ITRF 2008 - GDA94

BrettBlack1 — Mon, 06 Aug 2012 16:20:01 GMT

Are you not able to set your GPS Datum in GPS Preferences>Datum to ITRF 2008?

Re: Transformation Parameters for ITRF 2008 - GDA94

AndrewFitzpatrick — Mon, 24 Sep 2012 07:46:02 GMT

I have the same problem

There is no ITRF2008 datum in ARCPAD- has one been generated.

I'm also trying to convert ITRF2008 to GDA94 using an Omnistar HP GPS, I believe you need to specify the EPOCH date as well.

cheers

Andrew

Re: Transformation Parameters for ITRF 2008 - GDA94

BrettBlack1 — Mon, 24 Sep 2012 17:55:12 GMT

Sorry, I meant 2005. In the GPS Preferences>Datum, if utilizing SBAS (WAAS) corrections you can set your GPS Datum to ITRF2005 to to help correct for the shift.

Re: Transformation Parameters for ITRF 2008 - GDA94

AndrewFitzpatrick — Tue, 25 Sep 2012 00:17:17 GMT

Unfortunately ITRF2005 is not the same as ITRF2008, and it is ITRF2008 that the Australian Omnistar datum is using in their corrections http://www.omnistar.com/Support/Datums/AustraliaDatums.aspx

So this is still no use.