#Geodesy is an active hashtag on Bluesky. In the last 30 days, 7 people shared 22 posts with it — around 1 a day. Activity is down 50% versus the previous week, peaking on Jul 27 with 4 posts.

Posts with #Geodesy

Admirable Women

@admirablewomen.bsky.social

11 days ago

Fischer was the first woman at her agency to win the Distinguished Civilian Service Award. Her structural equations laid the foundation for the World Geodetic System, which engineers later used to build the satellite network powering modern smartphone GPS. Born #OTD in 1907. #WomenInSTEM #geodesy

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Alisa Bokulich

@alisabokulich.bsky.social

over 1 year ago

Recordings of talks from the conference Pragmatism & the Philosophy of Science held at Rotman Institute at Western U Sept 2024 are now on Youtube! Here's my talk on "The Geodetic & Metrological Roots of C.S. Peirce’s Pragmatism" if you're interested... #HPS #pragmatism #Peirce #geodesy #metrology

youtu.be

Pragmatism & The Philosophy of Science: Fall 2024 Conference - Alisa Bokulich

YouTube video by Rotman Institute of Philosophy

4 20 82

Julie Elliott

@julieelliott.bsky.social

9 months ago

West was also manager for the radar altimetry data processing project for Seasat, the first satellite designed to collect oceanographic data. #geodesy ⚒️🧪

History of Geology @historyofgeology.bsky.social

October 27, 1930, birthday of American mathematician and computer programmer Gladys Mae West. She created an accurate model of the Earth's shape, and her work on satellite geodesic modelling laid the foundations for GPS technology 🛰️🌐 en.wikipedia.org/wiki/Gladys_...

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Hugh Pumphrey

@hughpumphrey.bsky.social

over 1 year ago

For #BenchmarkMonday an example which is normally very hard to see on account of the texture of the stonework, but which becomes clearly visible when the sun is at just the right angle. ( #geodesy ). (It is this one: www.bench-marks.org.uk/bm120710 )

Rough-textured sandstone surface with a benchmark (horizontal line and arrow pointing upwards at it). Sunlight from left makes the benchmark more visible than usual.

1 4 41

Dr Joanne Williams

@jowilliams.bsky.social

8 months ago

XKCD is straying into #geodesy again. Assuming you knew the mass and dimensions of the boat, the force on the line and the water density, how accurately could you estimate g and hence planetary mass? It's absurd. But so are the GRACE satellites! Geodesists are good at absurd. xkcd.com/3179

Beret Guy fishing has hooked rock at the bottom of the water. He says "It feels like a big one! At least 10 to the power 24 kilograms!" (ie the mass of Earth). Cartoon from xkcd.com

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Julie Elliott

@julieelliott.bsky.social

11 months ago

A tribute to the toughness and longevity of Trimble Zephyr Geodetic GPS/GNSS antennas: 18 years after the goat incident mentioned below, I just used the same antenna to set up a campaign survey site in another part of Alaska. Still tracks satellites just fine! #geodesy ⚒️🧪

A photo of a campaign GPS/GNSS site. A yellow and black tripod takes up the lower part of the picutre. A green tribrach and gray optical plummet (for leveling) are attached to the top of the tripod. A white circular antenna is attached to the optical plummet. The edge of the antenna facing the camera says "Trimble" in blue letters. Just above the words are two bite marks made by a very curious and naughty mountain goat years earlier.

Julie Elliott @julieelliott.bsky.social

#FieldworkFriday #fieldphotofriday This photo was taken during my PhD when I returned to a campaign GPS site to find that a mountain goat had knocked the tripod over and taken a bite out of the antenna. The guilty party left behind clumps of white hair and hoof prints as incriminating evidence.

A white disc shaped GPS antenna with a bite taken out of the edge thanks to a truly obnoxious mountain goat.

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Julie Elliott

@julieelliott.bsky.social

10 months ago

For #FieldworkFriday, some of the benchmarks I've surveyed over the past few weeks. Some are more challenging to use than others, but they're all interesting. #geodesy ⚒️🧪

Brass disk with a circle in the center. Inside the circle is a line with a punchmark/divot in the center. In concentric circles around the center circle are inscriptions: "4240T 2000 For Info Contact Director Washington DC National Ocean Service Bench Mark".

Brass disk recessed into paving. A layer of mud and moss had to be removed to find it. There is a circle in the center of the disk with two lines dividing the circle into quarters. Around the outer edge of the benchmark are the words "Z22A 1994 National Ocean Service".

A brass disk sites in rock. In the middle of the disk is a triangle with a center divot. At the top of the Triangle, it says TSINA EASTBASE. At the bottom, it gives the year as 1941. Around the edge of the benchmark are the words U.S. Coast & Geodetic Survey Triangulation Station.

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Roelof Rietbroek 🌍 👀

@drstrawpants.wobbly.earth

over 1 year ago

“Changing sea level, changing shorelines: integration of remote-sensing observations at the Terschelling barrier island” by my PhD student Bene Aschenneller is now online in its final version doi.org/10.5194/nhes... What did he show in this meticulous study? #geodesy #sealevel #altimetry #scisky 🧪

doi.org

Changing sea level, changing shorelines: integration of remote-sensing observations at the Terschelling barrier island

Abstract. Sea level rise is associated with increased coastal erosion and inundation. However, the effects of sea level change on the shoreline can be enhanced or counteracted by vertical land motion ...

2 10 27

Seismological Society of America

@seismosocam.bsky.social

about 1 year ago

🎉Thank you National Science Foundation, for all the #NSFfunded #seismological science you support, including the SAGE and GAGE facilities operated by @earthscope.org. Our current understanding of #earthquakes, #volcanoes and #geodesy research would not be possible without you. ⚒️ 🧪

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Patrick Marques

@pmarques35.bsky.social

5 months ago

[1/8] Étienne Ghys, mathématicien au CNRS et à l’ENS de Lyon, retrace l’histoire de la mesure de la Terre. Il montre comment la détermination de sa forme mêle sciences, expéditions et rivalités politiques entre France et Royaume-Uni. #geography #geodesy #scientifichistory #earthshape

theconversation.com

Déterminer la forme de la Terre : une aventure scientifique et politique entre la France et le Royaume-Uni

Quelle est la forme exacte de la Terre ? Est-elle aplatie ou plutôt allongée aux pôles ? La question a agité les milieux scientifiques anglais et français pendant plusieurs siècles.

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Hugh Pumphrey

@hughpumphrey.bsky.social

over 1 year ago

My contribution to #BenchmarkMonday ( #geodesy ) is this splendid mark on St. Giles Cathedral, #Edinburgh (www.bench-marks.org.uk/bm33499).

A small bit of a stone church with some steps and columns, and a splendid benchmark.

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Kristine M. Larson

@funwithgps.bsky.social

over 1 year ago

So nice to see another John Wahr early career award winner. I am sure John would be so happy to see what is possible now with the expansion of modern GNSS tools. #geodesy

Gareth Funning @gfun.earth

Day 2 of #AGU24, and I'm in the Geodesy awardees session. Here, John Wahr Early Career Award winner, Hilary Martens, is giving a short talk on her work in surface loading. Here she shows loading changes from atmospheric rivers. 1 m of water storage change in one wet winter, detected with GNSS!