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Pierre Sakic

@pierreskc.bsky.social

Giving coordinates to the Earth; on land, in space, and under the sea 🌍 🛰️ 🌊 🌐 Research engineer @IPGP 🌋 Quarry diving 🤿 & Sunday #urbex 🏚️ Perso. opinions here

21 Followers  |  53 Following  |  31 Posts  |  Joined: 02.02.2025  |  2.0878

Latest posts by pierreskc.bsky.social on Bluesky

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Insupportable...
A. Chaque. Putain. De. Fois. où tu dois travailler avec.

16.05.2025 08:26 — 👍 31    🔁 2    💬 6    📌 0
A crt tv with a vcr and taped next to it. On the tv is a shot from the CGI intro to an "eyewitness" documentary

A crt tv with a vcr and taped next to it. On the tv is a shot from the CGI intro to an "eyewitness" documentary

this is the equivalent of a religious pilgrimage for me

11.05.2025 00:27 — 👍 29    🔁 2    💬 2    📌 0
Row of Ukrainian and European flags flying together in center Kyïv during a May's sunset sky

Row of Ukrainian and European flags flying together in center Kyïv during a May's sunset sky

Why they fight
Why we shall stand with them

(perso. pic., Kyïv, May 2019)
#SlavaUkraini

10.05.2025 08:34 — 👍 0    🔁 0    💬 0    📌 0
Earthquake source parameters

Earthquake source parameters

Mw=6.3, TURKEY (Depth: 4 km), 2025/04/23 09:49:10 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us7000pufs

23.04.2025 10:30 — 👍 6    🔁 7    💬 0    📌 0
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Anchor Bolts xkcd.com/3078

19.04.2025 05:03 — 👍 9480    🔁 731    💬 316    📌 94
Researchers on a ship’s deck deploy a seafloor geodesy instrument into the ocean at sunset. Crew members in safety gear oversee the operation as a crane lowers the orange and white device. Similar instruments are staged on deck, ready for deployment. The ocean stretches to the horizon under a warm, glowing sky.

Researchers on a ship’s deck deploy a seafloor geodesy instrument into the ocean at sunset. Crew members in safety gear oversee the operation as a crane lowers the orange and white device. Similar instruments are staged on deck, ready for deployment. The ocean stretches to the horizon under a warm, glowing sky.

Seafloor geodesy is a cutting-edge field that tracks precise movements and deformations of Earth’s crust beneath the oceans. We’re developing FAIR-aligned archiving standards and automated processing to improve seafloor geodesy data set discovery and access.

➡️ loom.ly/i2Tk2zk

19.03.2025 17:16 — 👍 8    🔁 2    💬 0    📌 0
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Observatoires volcanologiques et sismologiques - Institut de Physique du Globe de Paris L'IPGP est en charge de la surveillance des quatre volcans actifs français situés outre-mer, ainsi que de leur sismicité régionale et des risques poten ...

🌍🌋 La FAQ des observatoires volcanologiques et sismologiques est en ligne ! 🌋🌍

Vous vous interrogez sur la surveillance des volcans et des séismes ? L’IPGP répond à toutes vos questions !

👉 www.ipgp.fr/observation/...

Informez-vous et partagez ! 📢 #IPGP #Volcans #Séismes #FAQ #Science

12.03.2025 16:59 — 👍 8    🔁 7    💬 1    📌 0

C'est du génie

12.03.2025 19:07 — 👍 0    🔁 0    💬 0    📌 0
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Water Damage xkcd.com/3059

05.03.2025 19:56 — 👍 3851    🔁 293    💬 41    📌 23
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Faces of the other.
#urbex #germany #lostplaces #soviet

05.03.2025 11:16 — 👍 17    🔁 4    💬 0    📌 0

I remember when 10 years ago as a random PhD student I attended proudly to E. M*sk's keynote at @agu.org's Fall Meeting.

The wolf was in the sheepfold... I don't think anyone in Moscone's plenary room at this moment imagined that this same guy would screw everything up a decade later.

04.03.2025 17:17 — 👍 2    🔁 0    💬 0    📌 0
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Welcome to the Bluesky account for Stand Up for Science 2025!

Keep an eye on this space for updates, event information, and ways to get involved. We can't wait to see everyone #standupforscience2025 on March 7th, both in DC and locations nationwide!

#scienceforall #sciencenotsilence

12.02.2025 17:04 — 👍 11527    🔁 5473    💬 291    📌 676
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Oh yes, Homer’s famous “Tes Thdpssssps.”

👍🏻

20.02.2025 03:51 — 👍 10099    🔁 2767    💬 275    📌 716
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“Arbeiten für den Frieden” (Working for peace) – By Walter Womacka, 1960 – Eisenhüttenstadt, Germany

18.02.2025 12:56 — 👍 11    🔁 1    💬 1    📌 0
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Hipster RINEX: Recording satellite observations before it was cool

15.02.2025 12:59 — 👍 4    🔁 0    💬 0    📌 0
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Une belle #thingsMap réunionnaise (en roche volcanique en plus !) 🇷🇪
cc @JulesGrandin

03.08.2022 06:56 — 👍 0    🔁 0    💬 0    📌 0
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Just a wonderful November sky over @GFZ_Potsdam's Campus

01.11.2021 18:25 — 👍 0    🔁 0    💬 0    📌 0
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The R/V Tethys II is leaving Toulon's harbor for the #FocusG1 campaign, ready to retrieve geodetic acoustic ranging data and perform the 1st operational GNSS-Acoustic expt. in Europe off the coasts of Sicily! cc
@INSU_CNRS @IUEM_Brest @LIENSsCNRSULR/@UnivLaRochelle @GFZ_Potsdam

21.08.2021 06:26 — 👍 0    🔁 0    💬 0    📌 0

Hopefully, the CNRS was created 6 months before to avoid the waise of young gray matter 😏

x.com/fermatslibrary…

18.06.2021 23:19 — 👍 0    🔁 0    💬 0    📌 0

You know you need vacations when you write :wq in your teammate's chat window

20.05.2021 14:04 — 👍 0    🔁 0    💬 0    📌 0
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Our GNSS/A seafloor geodetic positioning protocol using an Unmanned Surface Vehicle and additional Direction-of-Arrival observations is available in @FrontEarthSci!

A collaboration between @UBO_UnivBrest/@IUEM_Brest, @UnivLaRochelle/@LIENSsCNRSULR, @ixblue, & @GFZ_Potsdam

x.com/FrontEarthSci/…

14.04.2021 09:38 — 👍 0    🔁 0    💬 1    📌 0
Combination of GNSS orbits using variance component estimation Over the past years, the International GNSS Service (IGS) has been putting efforts into extending its service towards the Multi-GNSS Experiment and Pilot Project (MGEX). Several MGEX Analysis Centers (ACs) contribute by providing solutions containing not only GPS and GLONASS but also Galileo, BeiDou, and QZSS. The MGEX orbit and clock combination is a product that is still not consolidated inside the IGS and requires studies in order to provide a consistent solution. In this contribution, we present a least-squares framework for a multi-GNSS orbit combination, where the weights used to combine the ACs' orbits are determined by least-squares variance component estimation. We introduce and compare two weighting strategies, where either AC specific weights or AC and constellation specific weights are used. Both strategies are tested using MGEX orbit solutions for a period of two and a half years. They yield similar results with an agreement with the ACs' orbits at the one centimeter level for GPS and up to a few centimeters for the other constellations. The agreement is generally slightly better with the AC and constellation weighting. A comparison of our combination approach with the official combined IGS final solution using three years of GPS, and GLONASS orbits from the regular IGS processing shows an agreement of better than 5 mm and 12 mm for GPS and GLONASS, respectively. An external validation using Satellite Laser Ranging (SLR) is performed for our combined MGEX orbit solutions with both weighting schemes.

The presentation of our new strategy for combining GNSS orbit products in a multi-constellation context is available as a preprint on EarthArXiv here:cc @IGSorg @ITRF_RefFrame

x.com/EarthArXiv/sta… doi.org/10.31223/X5MK64

23.12.2020 14:33 — 👍 0    🔁 0    💬 0    📌 0
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Der Mensch bezwingt den Kosmos
(Man conquers the cosmos)

Fritz Eisel, 1972

Rechenzentrum, Potsdam

18.10.2020 13:44 — 👍 0    🔁 0    💬 0    📌 0
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pour @JulesGrandin, un très belle #thingsMap que j'avais vu il y a quelques temps devant l'@IPGP_officiel 🌎

07.04.2020 09:36 — 👍 0    🔁 0    💬 0    📌 0

Let's continue our day tour about catastrophic misinterpretations of the ordinate axis 🤦²

x.com/MarekGierlinsk…

06.04.2020 15:33 — 👍 0    🔁 0    💬 0    📌 0

"There is a small problem in this curve... the ordinate is distorted: it goes from 200 to 500, then from 500 to 1000 with a deviation that is reduced, which artificially brings the curves closer..."

Éditorialist on the major French public radio 🤦‍♂️

x.com/HydrePrever/st…

06.04.2020 08:11 — 👍 0    🔁 0    💬 0    📌 0
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The first results of our @IGSorg multi-GNSS orbit combination strategy have been published in @copernicus_org Advances in Geosciences

adv-geosci.net/50/57/2020/

24.02.2020 12:15 — 👍 0    🔁 0    💬 0    📌 0

"GNSS for Science" Colloquium at @ObsMip next February in memory of Richard Biancale

x.com/aftopo/status/…

29.10.2019 09:55 — 👍 0    🔁 0    💬 0    📌 0

Wow, maybe the best (complete and aesthetic) accuracy/precision chart I have ever seen!

x.com/UniStuttgartNA…

17.10.2019 21:33 — 👍 0    🔁 0    💬 0    📌 0

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