Last seen: May 28, 2026 2:28 pm
In USVI OPUS returns heights that are related to VIVD09.
FrancisH - I never made any reference to the leveled vertical network in Indonesia - my response was about the lack of realization of the WGS 84 refer...
Since the U.S. National Geospatial-Intelligence Agency (NGA), who are responsible for the definition and maintenance of World Geodetic System 1984 (WG...
If you have WGS 84 ellipsoid heights and transform them to a different datum (e.g. NAD 83) you still have ellipsoid heights which have nothing to do w...
"Here's something: In Oklahoma, Published NGS Benchmarks are notoriously inconsistent with the results we get from the CORS. I'm talking 0.3 foot or s...
I hate those exploding coordinates - I can't afford to lose any more digits.
Your estimate for Seattle is good but It's more like 47 m around Miami. I corrected Wikipedia to reflect that value.
Unfortunately the full capability of these additional constellations won't be realized until several things happen. The National Geodetic Survey need...
Paul,Not sure what you're point is. The beta xGEOID16 model used GRAV-D data collected up to Dec of 2015 to predict what heights will be with respect...
We used the Macrometers for the first network GPS survey ever performed which was Summit Co., Ohio in 1983. The process was as John Hamilton describe...
GEOCON/GEOCON11 work very well, regrettably NGS has done almost nothing to market these tools to the user community. Not to mention that fact that th...
Get use to it. NGS is currently in the analysis stage of what they reference as REPRO2016 . They haven't released any specifics yet but the three-di...
The mark you found is AU1060 for bench mark K 168, however it was originally set as New Orleans Longitude - an astronomic station.set to help control ...
I attended the recent NSPS/MAPPS meeting where Dr. Dru Smith from NGS talked about all things NGS. He specifically noted that NGS intends that OPUS, ...
The old booklets for computing the relationship for Lat/Long to/from SPC for NAD 27 were commonly called Blue Books before NGS used the same name to d...
John, you are most correct that their is now as USSD to NAD 83 (1986) transformation in NADCON. It gives the same values that I computed without pro...
As previously pointed out, the U.S. Standard Datum/North American Datum is not NAD 27. In reviewing the control in the NGS database I find there are ...