I hope this will help - a bit long but good history. First as john-putnam noted the HARNs were just different realizations of the original adjustment...

"ultimately the data is WGS84, one of two flavors". Careful there! First of all there have been eight versions of WGS 84, the most current is WGS 84...

Yes, he and I are old friends.

Check with Dave Ingram -- [email protected], I believe he has one for sale.

A historical note, all geodetic control published by U.S. Coast & Geodetic Survey/National Geodetic Survey was referenced to south until the publi...

Get ready the new datums will go live next summer. Big changes coming.

At the heart of any counties system should be the fundamental definitions of the horizontal (geometric) and vertical datums and possibly tidal datums ...

Contact Dave Ingram -- [email protected], Dave has quite a collection of old instruments and may have what your looking for.

The days of NGS having any meaningful field force have been gone for decades due to the development of GPS technology. What they use to do at the loc...

MightyMoe is right on – we will all likely be dust and long forgotten before FEMA does anything systematic about updating the maps. Regrettably the a...

As previously stated if possible always use the passive bench marks published by NGS to do your work. If not realistic and you use OPUS please make s...

See NGS 2010 Bench Mark Reset Procedures --/p> Pages 12-17

If this is a project in NAD 83 (2011) and it's in a state that is legislatively defined by the U.S. Survey Foot then it should still be in USSF. The ...

1. Current measuring equipment provides greater positional accuracy than state plane coordinate systems are capable of reproducing. Please explain yo...

Should be fun - livers are bad and must be punished.

We'll be there. Looking forward to seeing everyone.