Hopefully humorous related topic xkcd cartoon (xkcd.com) Enjoy.?ÿ Now if only everyone could think like an NGS-er...

While likely a troll attempting to generate interest in himself, I will add to Norman Oklahomaƒ??s comments. JT50ƒ??s apocryphal ƒ??least squares adju...

@am95405 I appreciate your aggravation with paying so much for a text that has not been throughly checked. I do not know whether there is an errata w...

@john-hamilton I recollect discussions about the use of the crosshairs on digital levels. Basically the argument was that they were used for pointing ...

@jalbrz The way things work nowadays is that federal agencies are not given enough resources to do what they are mandated to do. Instead they either ƒ...

I recollect projects (not individual submissions like GPSonBM) where offsets from vertically set disks were used. ?ÿ The NGS Instrumentation and Metho...

@john-hamilton While I would always argue for more data, I agree that GPS observed on vertical angle heights does not contribute to the hybrid model....

@rover83 Thanks for the link to the changes document. Good resource. I agree that many are not sufficiently interested in the details of the data sho...

@john-hamilton Am I incorrect in my recollection that the NAVD88 value reported by OPUS and its variants is merely the the ellipsoid height determine...

I just downloaded the datasheet and find many of your issues addressed. See annotated screen capture below: ?ÿ ?ÿ I am curious why the datasheet for a...

Looking at the map of differences between GEOID12B and GEOID18 (see SPMPLSƒ??s post for URL), raises some questions in some limited areas. Whatƒ??s th...

Looking at the NGS Geoid page, I cannot find a reference to which model is considered ƒ??official.ƒ? Both the 12B and 18 values are shown on NGS data...

I am surprised to see how many former employees of Geo/Hydro are on this board. I heard some interesting stories from an old colleague who went to wor...

For photos of the Macrometer see the previous thread:/p> Closest I ever came to one of these was at NGS HQ. ?ÿ

Prompted by this thread, I did a little reminiscing about early equipment. I was surprised to see an advertisement for an Allen Osborne Associates Tur...