AUSPOS coordinate conversions

www.ngs.noaa.gov

Look for "HTDP" at Lee's link. What you are wanting to do is to convert your ITRF2008 positions to NAD83(2011). But far better, and probably much easier, would be to send the raw data that was once sent to AUSPOS into OPUS to get an new resolution reported in the appropriate zone.

TBC has a transformation from ITRF - NAD83 but I don't know how good it is. I thought NGS had one in their Geodetic Toolkit but if they do it's not immediately obvious.

Why are you sending data from Vermont to AUSPOS? OPUS and Trimble's RTX-PP will both return values in both ITRF and NAD83; if you just want a comparison between the results obtained from the different services you can compare the ITRF values.

If you want to e-mail me the data I'll run it through TBC for you.

I had deleted the link but it's http://www.ngs.noaa.gov&apos ;">www.ngs.noaa.gov

I couldn't remember which program did it and none of them state it in the description.

Edit: This link will take you straight to the tool:

http://www.ngs.noaa.gov/TOOLS/Htdp/Htdp_transform.html

I did run the points through OPUS but I wanted to try AUSPOS since I was surprised at the misclosure when I traversed between the gps pairs (I also had a pair of intermediate gps points and I cant get anything to work out very well regardless of what I hold). It looks like AUSPOS will process multiple points together like OPUS Projects so that's why I tried that way. I'm getting ready to take the OPUS Projects training in a few weeks. I did use an NGS Geodetic tool to go from IGS 08 to VTSPCS NAD 83 but I wasn't sure if that was an accurate method or if it's similar to CORPSCON.

Lee D, I'll be sending you an email shortly, thanks!

Gregg

Here is a link to a worked example:

http://www.amerisurv.com/PDF/TheAmericanSurveyor_Silver-GeodeticPreppers_March2015.pdf&apos ;">Geodetic Preppers

You can use the Online toolkit which will make it a bit easier.

M