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base9geodesy
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What a great day to be a surveyor.  After two years of nagging the University of Cincinnati, this morning a small group of us were finally allowed to search for the remnants of the telescope pillar of the old latitude observatory (1899-1915).  With the use of ground penetrating radar we were quickly able to identify the most likely area and the first push of a probe we knew we had it.  It's hard to describe to non-surveyors what it feels like when you've uncovered a mark not seen in 100+ years.  The Professional Land Surveyors of Ohio will work with UC to come up with an appropriate commemorative monument and host a dedication event sometime next spring. 

DSCN0706
DSCN0720

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FNG
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Good morning!

I'm helping Underground Detective who worked on this project with you on a blog post about the project.

I'm wondering if I could quote your post above within the blog.  I'd be happy to provide a backlink to any professional site you'd like me to reference.

My email address is [email protected]  Phone number: 513-521-5129.

Thank you!

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Paul in PA
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Will you be comparing record latitude observations with current GNSS observations?

Paul in PA

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base9geodesy
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While it is certainly our intention to try and perform GPS observations at the site we expect that our effort may be impacted by a rather significant tree just slightly to the southeast of the pillar.  Even if we do get good results it is always a struggle to compare a coordinate that was derived from astronomic observations with a geodetic position.  Even the best deflection of the vertical model such as DEFLEC12 is only a good approximation.  A couple of years ago I performed an analysis of 80 USC&GS astronomic stations using their published astronomic coordinates and DEFLECT12 to compute their geodetic coordinates and then comparing those stations with their published NAD 83 values - my results indicated a 2 sigma difference of 1.04" in latitude and 1.65" in longitude. 

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Wendell
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I've always said that the treasure hunt is the most fun part of surveying. Congrats and thanks for the photos! 🙂

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SPMPLS
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I have had the pleasure of visiting the Latitude Observatory in Ukiah California with our NGS Regional Geodetic Advisor.

Observatory Park

https://www.ngs.noaa.gov/web/news/NOAA_Heritage_Asset_on_Loan.shtml

I knew there had been one in Cincinnati during the early years of the project. That is very cool that your were able to locate the remnants of the pillar and that the site will be memorialized in some way. The long term viability of the Ukiah observatory really needs to be secured so that this historical site is around for many generations to come.

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SPMPLS
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GeeOddMike
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Time to break out the T3!

For those interested, here’s a link to the Manual of Geodetic Astronomy: ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/cgs_specpubs/QB275U35no2371947.pdf

Ah, the ancient arts...

I imagine the leaves will be off before long. 

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