BeiDou Interface Control Document available here:

Lee D, post: 329267, member: 7971 wrote: Stupid question time... I thought that the current IGS08, ITRF, and WGS84 datums were pretty much aligned wit...

The HTDP tool incorporates officially adopted transformation parameters. You can sort through the source file (a FORTRAN file included in the download...

I do not know how the orthometric height is to be determined in OPUS Projects. That said, the process described in the NGS Orthometric height determin...

Unfortunately, it appears that there were no candidates for the advertised position. If anyone is able to drop everything to take advantage of this op...

States using International foot plus conversion factorsMea culpa.1. By definition one inch = 2.54 cm2. Since twelve inches = one foot, 12 * 2.54 cm = ...

States using International foot plus conversion factorsBy my count eight states use the international survey foot. They are: OR, MT, ND, UT, AZ, AR, M...

WGS 84 geoid heightsCountries like the US and Canada are working to base their national height systems on GPS-derived ellipsoid heights and a high-res...

WGS 84 geoid heightsAt the bottom of this note are links to two web-based geoid height calculators for use with WGS 84 coordinates.Without excessive c...

As I said I was not trying to be a jerk. I was looking to provide a nudge in the event your situation would allow it.Good luck. DMM

Not trying to be a jerk but have you looked at your signature? When I was younger and free of encumberances, I did not take advantage of some opportun...

Just curious, what were the respective fixed /total integer ratios and rms of fit?As most of the other automated positioning tools: AUSPOS, SCOUT, etc...

Doubt NGS can/would initiate legal proceedingsComments and suggestions from a non Lawyer:I am pretty certain that NGS has no authority to levy fines. ...

FWIW,I recognize the appeal of those marks in the ground. They represent a tangible link to a height system. Unfortunately, their reliability is quest...

Howdy,As you know, the NGS Data Base includes monuments established by other agencies. I expect this was set by the USGS. The designation indicates "E...