#geoid — Public Fediverse posts

"We like to think of our home as a nice, smooth sphere. But mapping the Earth’s gravitational field provides a different view of the planet."

https://www.wired.com/story/nasas-new-3d-model-shows-lumpy-earth/

Interactive 3D model: https://svs.gsfc.nasa.gov/5660

#news #science #earth #geoid #GravitationalField #gravity #NASA

Unter der Antarktis liegt ein Schwerkraft-Tief. Warum das von internen Einflüssen erzeugte Schwerefeld am Südpol so schwach ist. #Schwerefeld #Schwerkraft #Antarktis #Erdmantel #Geowissen #Geoid
https://www.scinexx.de/news/geowissen/unter-der-antarktis-liegt-ein-schwerkraft-tief/

#DerStandard:
"
Gladys West: Die "unerkannte" Forscherin hinter dem GPS-System ist tot
"
"Die afroamerikanische Wissenschaftlerin entwickelte das Schwerkraftmodell der Erde, auf dem das Ortungssystem aufbaut. Sie starb am 17. Jänner"

https://www.derstandard.at/story/3000000304865/gladys-west-die-unerkannte-forscherin-hinter-dem-gps-system-ist-tot

20.1.2026

#Erdmodell #Geoid #GladysWest #GNSS #GPS #Mathematik #Navigation #Satellitennavigation #Raumfahrt #Schwerkraftfeld #SpaceFlight #Transit #VirginiaTech

Giant ‘Gravity Hole’ in the Ocean May Be the Ghost of an Ancient Sea
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https://www.scientificamerican.com/article/giant-gravity-hole-in-the-ocean-may-be-the-ghost-of-an-ancient-sea1/ <-- shared technical media article
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https://doi.org/10.1029/2022GL102694 <-- shared 2023 paper
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https://oceanservice.noaa.gov/facts/geoid.html <-- technical description of a geoid
--
[theories abound]
"... KEY POINTS
• Employing time dependent global mantle convection models since the Cretaceous. [the authors] simulate the origin of the enigmatic Indian Ocean geoid low
• Plumes forming along the edges of the African Large Low Shear Velocity province (LLSVP) control the regional geoid in the Indian Ocean
• These plumes, in turn are generated by lower mantle Tethyan slabs that perturb the African LLSVP…”
#GIS #spatial #mapping #geoid #gravity #mapping #global #remotesensing #plume #ocean #ancientocean #gravityhole #geophysics #IndianOcean #geology #structuralgeology #crust #mantle #core #high #low #potsdamgravitypotato #IOGL #tomography #model #modeling #plate #tectonicplate #Tethys #slab #mantleplume #LLSVP #AfricanLargeLowShearVelocity

One day One map: Earth's shape

Source: Mad Maps, 2019
#geoid #cartography #maps

We continue our collaboration with #Gigafact, another non-profit with a specialized mission: provide impoverished newsrooms with brief, plain language #ClimateMythDebunkings ready to drop into news coverage.

Here's the latest output, covering #SeaLevelRise.

Sea level is fairly easy fodder for creating confusion; the behavior of sea level varies broadly depending on where on our #geoid one measures. A noisy signal but with a clear broad trend.

https://skepticalscience.com/fact-brief-sealevel.html?utm-source=,mastodon&utm-campaign=socialnetworks&utm-term=sks

Our Very Strange Search for ‘Sea Level’
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https://www.newyorker.com/magazine/2024/08/26/our-very-strange-search-for-sea-level <-- shared media/technical article
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#GIS #spatial #mapping #elevation #vertical #geoid #datum #verticaldatum #sealevel #risingsealevel #RSL #climatechange #survey #change #geology #isostaticrebound #glaciation #groundwater #subsidence #remotesensing #GPS #LiDAR #altimetry #change #spatialanalysis #model #modeling #spatiotemporal #sealrock #meansealevel #NGVD29 #NAVD88

@BKG
Wieder was gelernt.
Aber nicht ganz verstanden: liegt's am #Geoid, daß der mittlere #Meeresspiegel der Adria (Pegel Triest) so unterschiedlich ist?
Und: werden mit steigendem Meeresspiegel die Berge immer "niedriger" (abgesehen von Eriosion und Tektonik)?

Moving Mountains - Reevaluating The Elevations Of Colorado Mountain Summits Using Modern Geodetic Techniques
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https://doi.org/10.1007/s00190-024-01831-8 <-- shared paper
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#GIS #spatial #mapping #NAVD88 #NAPGD2022 #Fourteeners #Colorado #elevation #3dep #geoid #mountains #mountain #orthometric #gnss #model #modeling #3dmodeling #numericmodeling #geostatistics #LiDAR #ellipsoidal #gravity #geopotential
@USGS @ngs

Genesis - A Flying Observatory To Measure Earth Down To The Millimetre [earth observation satellite]
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https://www.esa.int/Applications/Satellite_navigation/Genesis <-- Genesis home page
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https://doi.org/10.1186/s40623-022-01752-w <-- white paper
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#GIS #spatial #mapping #GNSS #earthobservation #satellite #remotesensing #precision #accuracy #genesis #millimetre #earthobservatory #geodetic #InternationalTerrestrialReferenceFrame #ITRF #planning #spacecraft #Galileo #GPS #usecase #appliedscience #infrastructure #positioning #navigation #earthscience #satnav #referencesystem #geoid #coordinatesystem
@ESA

Wo wir messen. Rot & gelb schraffierte Flächen sind bestehende & gepl. #Windparks, kl. rote Flächen #Offshore-Plattformen. Hier sieht man den Bedarf für exakten Höhenbezug i. d. #Nordsee. Wir messen g, um das #Geoid als #Höhenbezugsfläche wie an Land cm-genau berechnen zu können.

How The Indian Ocean Geoid Low Was Formed
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https://doi.org/10.1029/2022GL102694 <-- shared paper
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#GIS #spatial #mapping #remotesensing #gravity #geoid #geodesy #IndianOcean #formation #IOGL #model #modeling #geophysics #structuralgeology #crustal #mantle #convection #Tethyan #sea #ocean #subsidence #anomaly #spatialanalysis #spatiotemporal #tomography #density #rock #geology #tectonics #platetectonics

AgStack: Linux Foundation Project Will Bring Farms Online - The New Stack https://thenewstack.io/agstack-linux-foundation-project-will-bring-farms-online/ #LinuxFoundation #Agriculture #GreenEconomy #GeoID

Gladys West Modelled the Earth So That We Can Have GPS - The name Gladys West is probably unfamiliar, but she was part of creating somethin... - https://hackaday.com/2021/08/03/gladys-west-modelled-the-earth-so-that-we-can-have-gps/ #satellitenavigation #originalart #measurement #biography #featured #gpshacks #geoid #navy #gps