I rarely bring attention to my own published articles, but I feel this one is worth reading to get a better understanding of how NGS was able to bring historical data from a separate agency into their own database and get extremely close with modern positions for monuments that they never occupied or had any idea if they even still existed. Near the end of the story I also bring attention to the error (if that is what you want to call it) in the precise triangulation stations established by USC&GS (NGS) in the 1930's when compared to positions on these points obtained today with OPUS. Dave Doyle was very gracious to lend a lot of input on this story even though he has been retired. He is far from being done with surveying.
http://www.amerisurv.com/PDF/TheAmericanSurveyor_Penry-ComparingTwoBrickkilns_July2016.pdf
When I first read the title of you post I though it was about cars -- I saw "Comparing Two Bricklins." A hazy memory tells me that a Bricklin was some kind of kit car from back in the '70s.
Hey, the memory worked for once, sort of. It wasn't a kit car, but at least I had the decade right. Bricklin
I was excited to see this article. In some ways it helps answer questions I was looking into in prior threads. Dave's information quoted by Jerry lines up well with my measurements of the offset in my area, tens of miles from the nearest station having both classical triangulation and GPS data.
https://surveyorconnect.com/community/threads/nad83-harn-to-nad83-2011.326594/
https://surveyorconnect.com/community/threads/understanding-datum-realizations.326677/
