@dave-karoly?ÿ Same here except problem exists on other threads (E.g. GEOID12B v Geoid 18). ?ÿ

@wspek UTM zones are NOT time zones. Expanding outward from Prea, I see Fortaleza (a well known site in international geodesy). It is in UTM Zone 30S....

Is this anywhere near your site? Forgot how big Brazil is.

contact the surveyors and ask for geodetic coordinates (latitude/longitude) in SIRGAS 2000. My best guess was that they were UTM coordinates because ...

On the question of which model of ellipsoid-geoid separation, I always recommend the most recent be used. In any event, the choice of which model to u...

The NGS provides a tool to solve the forward problem: solving for an unknown pointƒ??s given starting geographic coordinates, geodetic azimuths and el...

I assume, perhaps unrealistically, that a licensed surveyor would know how to transform a geodetic to a plane azimuth especially since the convergence...

FWIW, ?ÿ I agree with other posters who encouraged you to provide more information. I copy below extracts for a CT classically positioned monument for...

@loyal There is always:    

The Mason-Dixon Line Preservation Partnership has a nice site here: There was some controversy, years ago, when the ƒ??preservationistsƒ? were aghas...

@john-nolton As I indicated, I was merely quibbling. That said, those interested in the history of geodetic surveys by the USC&GS should enjoy Jo...

I would argue (pedantically) that Geodesy in the 1800s was hardly a ƒ??young science.ƒ? As a science centered on the ƒ??size and shape of the Earthƒ?...

?ÿ

Why do the Chinese hate Argentina? Iƒ??m joking. No experience with Beidou, just curious about how its data is used in combination with other signals....

To supplement MightyMoeƒ??s information, I copied segments of the NGS datasheet for a point in Maryland. Note that at the top of each datasheet is a s...