GSVS17 - Journal of Geodesy article now available for "free" download

Thanks GeeOddMike.

When I did a search I found the NGS web page for the GSVS-17 project. It includes four links. The first is a KML file of the official survey line, the second is to a spreadsheet containing the processed field data, the third is to the raw field data, and the fourth is to the JoG article.?ÿ The JoG link goes to a Springer web page where you can download the PDF file. 🙂

A Geoid Slope Validation Survey (2017) in the rugged terrain of Colorado, USA

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Or try this direct link https://link.springer.com/article/10.1007/s00190-020-01463-8

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@gene-kooper

i should have followed your link before posting. I usually see the graphic associated with mine. I thought it was not a direct link.

I have been reading the article and find it quite enjoyable. Among the elements new to me is the new approach to addressing refraction a particularly difficult problem in project area.?ÿ

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Lots to read and hopefully assimilate.

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i miss the gravity surveys.....

@jitterboogie

Meters have certainly improved. Shown below (from left) is a LaCoste-Romberg Model-G, a Scintrex CG-5, the Micro-g LaCoste FG5 and A10 meters and the Scintrex CG-6 meter. The Model-G and the two Scintrex are relative. The FG5 and A10 are absolute. All meters except the Model-G and CG-5 were used in the GSVS17 survey.

I have used a Model-G like the one shown (analog) and watched a FG-5 in operation. For more details see the?ÿ

http://microglacoste.com/pdf/Brochure-FG5.pdf And https://scintrexltd.com/product/cg-6-autograv-gravity-meter/ sites.?ÿ

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We used the CG-5s and several of the L&R meters.?ÿ I love that each one has it's "personality" too.

Thats an Older L&R meter with the original smaller case, and bottom leveling brass feet versus the newer top mounted thru screws and electronic levels. I got to Use G-317 a lot, and its sad I remember all of the meter numbers i used, or weird, or both.

All said, gravity directed me to land surveying, because I wasn't planning on a PhD in Geophysics.?ÿ Not the end, but definitely my limiting factor when making the decision to stop praying to the Gravity gods.?ÿ 😉

Some of my collegues went on to go work with MicroG, and they were just down the street from where I used to live in Colorado.

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My old boss knows Derek quite well, and you probably ran across each other somewhere, as the Gravity people are a very small and esoteric bunch i learned.

@jitterboogie

My involvement in gravity observation hardly made me a ƒ??gravity person.ƒ? Sorry if I left that impression. I made intermittent, limited extent relative gravity observations in support of efforts to resolve issues related to my former agencyƒ??s gravity data base.?ÿ

I confess to missing the days when the use of surveying instrumentation involved more than setting it up and pressing buttons. ?ÿ

@geeoddmike Do instrument users even need to press buttons anymore, or once set up do the instruments already know what to do? ????????

@geeoddmike

I loved the ability to watch the seimic waves in Nevada of the Pacific ocean when a storm was coming ashore in California.?ÿ It definitely opened my head to much much bigger pictures of how the universe is connected.

And then hated the earthquakes that essentially shut us down for days and about a week when those huge quakes in Banda Aceh and Tohoku hit.

Yay physics!

@jitterboogie

If you interested in a comprehensive though anecdotal history of gravity measurement, you might enjoy ƒ??The Hunt for Earth Gravityƒ? by John Milton (Springer, 2018). You may be familiar with his ƒ??Field Geophysics,ƒ? co-written with Asger Eriksen (I have the 4th Ed).?ÿ

BTW, did you know the original LaCoste meter weighed more than 40kg? The picture if from the book. The ƒ??tireƒ? is around the meter.

@geeoddmike

I'll take a look, it's the one topic i never tire of that is super heavy....?ÿ 😉