#geodetic — Public Fediverse posts

1918 Geographic Center Of The [contiguous] Lower 48 States [CONUS] - Lebanon, Kansas
--
https://clui.org/ludb/site/geographic-center-lower-48-united-states <-- shared technical article
--
https://www.ngs.noaa.gov/PUBS_LIB/GeoCenter_USA1.pdf <-- shared 1959 NOAA technical article
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https://www.smithsonianmag.com/smart-news/many-centers-united-states-180955253/ <-- shared 2015 technical article
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https://www.atlasobscura.com/articles/journey-to-the-center-of-the-united-states <-- shared technical media article
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In 1918, the US Coast and Geodetic Survey attempted to find the center of what was then the United States’ (lower) 48 states. Because they lacked the computing power to process the complex geometry of an irregular, 3D landmass, they placed a carefully scaled map of the 48 conterminous states onto a uniform piece of cardboard. After cutting it out, they determined the geographic center by finding the exact point at which the map balanced perfectly on a pin.
--
#spatial #mapping #USA #Lower48th #center #centre #Lebanon #Kansas #geodetic #geodesy #geography #spatialanalysis #cartography #PinAndCardboard #history #tourism #americana
@NOAA | @USGS | @us Coast and Geodetic Survey

1918 Geographic Center Of The [contiguous] Lower 48 States [CONUS] - Lebanon, Kansas
--
https://clui.org/ludb/site/geographic-center-lower-48-united-states <-- shared technical article
--
https://www.ngs.noaa.gov/PUBS_LIB/GeoCenter_USA1.pdf <-- shared 1959 NOAA technical article
--
https://www.smithsonianmag.com/smart-news/many-centers-united-states-180955253/ <-- shared 2015 technical article
--
https://www.atlasobscura.com/articles/journey-to-the-center-of-the-united-states <-- shared technical media article
--
In 1918, the US Coast and Geodetic Survey attempted to find the center of what was then the United States’ (lower) 48 states. Because they lacked the computing power to process the complex geometry of an irregular, 3D landmass, they placed a carefully scaled map of the 48 conterminous states onto a uniform piece of cardboard. After cutting it out, they determined the geographic center by finding the exact point at which the map balanced perfectly on a pin.
--
#spatial #mapping #USA #Lower48th #center #centre #Lebanon #Kansas #geodetic #geodesy #geography #spatialanalysis #cartography #PinAndCardboard #history #tourism #americana
@NOAA | @USGS | @us Coast and Geodetic Survey

Multidecadal Reconstruction Of Terrestrial Water Storage Changes By Combining Pre-GRACE Satellite Observations And Climate Data
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https://doi.org/10.5194/essd-18-1747-2026 <-- shared paper
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https://doi.org/10.5281/zenodo.15827789 <-- reconstructed fields and corresponding uncertainty datasets
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https://doi.org/10.5281/zenodo.16643628 <-- corresponding time series datasets
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#GIS #spatial #mapping #remotesensing #earthobservation #GRACE #GRACEFO #water #hydrology #hydrography #waterresources #waterstorage #planning #monitoring #spatialanalysis #spatiotemporal #climatemodel #climatechange #extremeweather #regression #AI #machinelearning #rainfall #precipitation #remperatures #parameters #gravity #geodetic #satellite #orbitography #geomorphometry #DORIS #global #reconstruction #limitations #usecase

Multidecadal Reconstruction Of Terrestrial Water Storage Changes By Combining Pre-GRACE Satellite Observations And Climate Data
--
https://doi.org/10.5194/essd-18-1747-2026 <-- shared paper
--
https://doi.org/10.5281/zenodo.15827789 <-- reconstructed fields and corresponding uncertainty datasets
--
https://doi.org/10.5281/zenodo.16643628 <-- corresponding time series datasets
--
#GIS #spatial #mapping #remotesensing #earthobservation #GRACE #GRACEFO #water #hydrology #hydrography #waterresources #waterstorage #planning #monitoring #spatialanalysis #spatiotemporal #climatemodel #climatechange #extremeweather #regression #AI #machinelearning #rainfall #precipitation #remperatures #parameters #gravity #geodetic #satellite #orbitography #geomorphometry #DORIS #global #reconstruction #limitations #usecase

Satellite Captures The First Detailed Look At A Massive Tsunami
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https://www.earth.com/news/satellite-captures-the-first-detailed-look-at-a-giant-tsunami/ <-- shared technical article
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https://doi.org/10.1785/0320250037 <-- shared paper
--
#GIS #spatial #mapping #satellite #remotesensing #earthobservation #geology #tectonics #Kuril #Kamchatka #Russia #Pacific #tsunami #NASA #SWOT #energy #dissipation #risk #hazard #model #modeling #DART #buoy #observation #instrumentation #waveforms #propogation #geodetic #spatialanalysis #spatiotemporal #marine #wave #megathrust #rupture #mechanics #altimetry #forecasting #hydrodynamic

Satellite Captures The First Detailed Look At A Massive Tsunami
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https://www.earth.com/news/satellite-captures-the-first-detailed-look-at-a-giant-tsunami/ <-- shared technical article
--
https://doi.org/10.1785/0320250037 <-- shared paper
--
#GIS #spatial #mapping #satellite #remotesensing #earthobservation #geology #tectonics #Kuril #Kamchatka #Russia #Pacific #tsunami #NASA #SWOT #energy #dissipation #risk #hazard #model #modeling #DART #buoy #observation #instrumentation #waveforms #propogation #geodetic #spatialanalysis #spatiotemporal #marine #wave #megathrust #rupture #mechanics #altimetry #forecasting #hydrodynamic

Atmospheric refraction, due to the different temperature/altitude profile in the atmosphere at different times of day...makes distant mountains appear taller or shorter.

The attached photo is a comparison of what I shot yesterday afternoon and this morning. The camera was set up within inches of the same location for both shots, and those mountains are between 50 and 120 miles away...so I'm saying that any parallax effect from camera location is essentially zero.

I have annotated with arrows where it's easy to make a comparison of how the near and far ridge lines overlap differently in the two photos.

This is a follow up to:
https://universeodon.com/@KrajciTom/115673789231444526

Imagine the care that was needed to conduct surveys before the GPS/GNSS era:
https://explorersweb.com/the-five-men-who-measured-mount-everest/

"The Great Theodolite built by Troughton & Simms in London stood nearly 1.5m high, had a horizontal circle one meter in diameter, and could read angles to a single second of arc. Moving it required 30 porters and sometimes elephants."

"The reduction of Nicolson’s observations was a colossal task. Each ray from each station had to be corrected for instrumental error, for temperature and pressure, and for the curvature of the Earth. Above all, they needed to correct for atmospheric refraction, which at those distances could amount to six or seven minutes of arc and change from hour to hour."

#Atmosphere #Refraction #Physics #Math #GIS #Datum #Survey #Geodetic #Map #Optics #Science #Parallax #Cool #NewMexico #Theodolite

Atmospheric refraction, due to the different temperature/altitude profile in the atmosphere at different times of day...makes distant mountains appear taller or shorter.

The attached photo is a comparison of what I shot yesterday afternoon and this morning. The camera was set up within inches of the same location for both shots, and those mountains are between 50 and 120 miles away...so I'm saying that any parallax effect from camera location is essentially zero.

I have annotated with arrows where it's easy to make a comparison of how the near and far ridge lines overlap differently in the two photos.

This is a follow up to:
https://universeodon.com/@KrajciTom/115673789231444526

Imagine the care that was needed to conduct surveys before the GPS/GNSS era:
https://explorersweb.com/the-five-men-who-measured-mount-everest/

"The Great Theodolite built by Troughton & Simms in London stood nearly 1.5m high, had a horizontal circle one meter in diameter, and could read angles to a single second of arc. Moving it required 30 porters and sometimes elephants."

"The reduction of Nicolson’s observations was a colossal task. Each ray from each station had to be corrected for instrumental error, for temperature and pressure, and for the curvature of the Earth. Above all, they needed to correct for atmospheric refraction, which at those distances could amount to six or seven minutes of arc and change from hour to hour."

#Atmosphere #Refraction #Physics #Math #GIS #Datum #Survey #Geodetic #Map #Optics #Science #Parallax #Cool #NewMexico #Theodolite

"The absence of #Canadian #geodetic observatories has direct consequences for its own space program. #RADARSAT, once a symbol of Canadian leadership in space, is today the only major commercial synthetic aperture radar mission not supported by the International Laser Ranging Service." - Anusuya Datta

"The absence of #Canadian #geodetic observatories has direct consequences for its own space program. #RADARSAT, once a symbol of Canadian leadership in space, is today the only major commercial synthetic aperture radar mission not supported by the International Laser Ranging Service." - Anusuya Datta

" #Canada’s failure to invest in modern #geodetic infrastructure has left it dependent on foreign systems...on the key networks of Very Long Baseline Interferometry (VLBI) and Satellite Laser Ranging (SLR) — the backbone of the world’s geodetic infrastructure — Canada looks no different from Africa..." https://gogeomatics.ca/canadas-geodesy-void-and-the-hidden-risks-to-economy-defence-and-sovereignty/

" #Canada’s failure to invest in modern #geodetic infrastructure has left it dependent on foreign systems...on the key networks of Very Long Baseline Interferometry (VLBI) and Satellite Laser Ranging (SLR) — the backbone of the world’s geodetic infrastructure — Canada looks no different from Africa..." https://gogeomatics.ca/canadas-geodesy-void-and-the-hidden-risks-to-economy-defence-and-sovereignty/

#FYI #NASA #CERES #Geodetic #oceanHeat

Original article (paywalled, log in to your local university library to read)

Cheng et al. 04 April 2024, Nat Rev Earth Environ 5, 232–234

Ocean heat content in 2023

https://doi.org/10.1038/s43017-024-00539-9

#climate #ClimateScience #climatechange #ClimateEmergency #ClimateCrisis #ClimateBreakdown #ClimateDisruption #globalWarming #globalHeating #ExtremeWeather #EcosystemCollapse #systemcollapse #ecocide #fossilfuels #Co2 #Co2Emissions #methane #GreenhouseGases

#FYI #NASA #CERES #Geodetic #oceanHeat

Original article (paywalled, log in to your local university library to read)

Cheng et al. 04 April 2024, Nat Rev Earth Environ 5, 232–234

Ocean heat content in 2023

https://doi.org/10.1038/s43017-024-00539-9

#climate #ClimateScience #climatechange #ClimateEmergency #ClimateCrisis #ClimateBreakdown #ClimateDisruption #globalWarming #globalHeating #ExtremeWeather #EcosystemCollapse #systemcollapse #ecocide #fossilfuels #Co2 #Co2Emissions #methane #GreenhouseGases

#FYI #NASA #CERES #Geodetic #oceanHeat

via #‪LeonSimons‬ ‪@leonsimons.bsky.social‬

To cite Ronny Chieng: It goes up! Even if you flip the chart upside down, it still goes UP!

"the near-term forcing increase might be much higher than models suggest"

https://bsky.app/profile/leonsimons.bsky.social/post/3lxyrfucmhk2y

#climate #ClimateScience #climatechange #ClimateEmergency #ClimateDisruption #ExtremeWeather #polycrisis #EcosystemCollapse #systemcollapse #ecocide #fossilfuels #Co2Emissions #methane #GreenhouseGases #KeepitInTheGround

#FYI #NASA #CERES #Geodetic #oceanHeat

via #‪LeonSimons‬ ‪@leonsimons.bsky.social‬

To cite Ronny Chieng: It goes up! Even if you flip the chart upside down, it still goes UP!

"the near-term forcing increase might be much higher than models suggest"

https://bsky.app/profile/leonsimons.bsky.social/post/3lxyrfucmhk2y

#climate #ClimateScience #climatechange #ClimateEmergency #ClimateDisruption #ExtremeWeather #polycrisis #EcosystemCollapse #systemcollapse #ecocide #fossilfuels #Co2Emissions #methane #GreenhouseGases #KeepitInTheGround

Researchers employ advanced #geodetic techniques to understand the river #Isar‘s behavior, #sediment transport, and the impact of human activities on this unique #ecosystem: http://go.tum.de/846800

#geodesy

📷S.Höcht

Researchers employ advanced #geodetic techniques to understand the river #Isar‘s behavior, #sediment transport, and the impact of human activities on this unique #ecosystem: http://go.tum.de/846800

#geodesy

📷S.Höcht

As A USGS Employee Working In Spatial Data: hehehehehehehehe
--
https://xkcd.com/2920/ <-- link to XKCD cartoon
--
"The standard North American NAD83 coordinate system is misaligned from the actual Earth, off-centre by about 7 feet. Someone knows where I am, and I'm in the wrong place."
#GIS #spatial #mapping #humour #humor #datums #coordinatesystems #NAD83 #NAVD88 #mappymeme #survey #USGS #NGS #benchmark #surveymarker #NorthAmerica #geodetic #geodesy
@XKCD

As A USGS Employee Working In Spatial Data: hehehehehehehehe
--
https://xkcd.com/2920/ <-- link to XKCD cartoon
--
"The standard North American NAD83 coordinate system is misaligned from the actual Earth, off-centre by about 7 feet. Someone knows where I am, and I'm in the wrong place."
#GIS #spatial #mapping #humour #humor #datums #coordinatesystems #NAD83 #NAVD88 #mappymeme #survey #USGS #NGS #benchmark #surveymarker #NorthAmerica #geodetic #geodesy
@XKCD

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

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
--
https://doi.org/10.1186/s40623-022-01752-w <-- white paper
--
#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

Geodetic Rates versus Geologic Slip Rates: Are They Equal?

Gauriau & Dolan explore the circumstances under which geologic slip rates and a geodetic slip-deficit rates may align or diverge.

Read more at: https://doi.org/10.26443/seismica.v3i1.1119

#Seismology #EarthquakeScience #peerreviewed #DiamondOpenAccess #earthquake #OpenAccess #openscience #geodetic #geology

Geodetic Rates versus Geologic Slip Rates: Are They Equal?

Gauriau & Dolan explore the circumstances under which geologic slip rates and a geodetic slip-deficit rates may align or diverge.

Read more at: https://doi.org/10.26443/seismica.v3i1.1119

#Seismology #EarthquakeScience #peerreviewed #DiamondOpenAccess #earthquake #OpenAccess #openscience #geodetic #geology

Shallow Slow Slip Events Identified Offshore The Osa Peninsula In Southern Costa Rica From GNSS Time Series [geologic faults / tectonics]
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https://doi.org/10.1029/2023GL104771 <-- shared paper
--
#GIS #spatial #mapping #GPS #survey #GNSS #costarica #earthquake #faults #faulting #tectonics #shallowslowslipevent #SSE #shallowslowslip #slowslip #geodetic #spatialanalysis #spatiotemporal #osa #OsaPeninsula #station #platetectonics #geology #megathrust #MiddleAmericanTrench #centralamerica #platemotion #model #modeling

Shallow Slow Slip Events Identified Offshore The Osa Peninsula In Southern Costa Rica From GNSS Time Series [geologic faults / tectonics]
--
https://doi.org/10.1029/2023GL104771 <-- shared paper
--
#GIS #spatial #mapping #GPS #survey #GNSS #costarica #earthquake #faults #faulting #tectonics #shallowslowslipevent #SSE #shallowslowslip #slowslip #geodetic #spatialanalysis #spatiotemporal #osa #OsaPeninsula #station #platetectonics #geology #megathrust #MiddleAmericanTrench #centralamerica #platemotion #model #modeling

@jon I have only passed through a couple of times, never spent any longer time there. The weather is nice, yes. Walked along the river and admired the bridge in the early morning the 3rd when I was going the other direction. Didn’t see the Lenin plaque but saw a couple of info posters about the #Struve #geodetic arch from 1816–1855. Which was interesting in a nerdy way.

Oh, and #Tornio has a bar called “Little Berlin”. Will have to visit that. I expect disappointment, though…

@jon I have only passed through a couple of times, never spent any longer time there. The weather is nice, yes. Walked along the river and admired the bridge in the early morning the 3rd when I was going the other direction. Didn’t see the Lenin plaque but saw a couple of info posters about the #Struve #geodetic arch from 1816–1855. Which was interesting in a nerdy way.

Oh, and #Tornio has a bar called “Little Berlin”. Will have to visit that. I expect disappointment, though…

This Day in Alaskan History-July 11th, 1921
[the_ad id="30587"]

July 11 1921

[the_ad id="37544"]
https://alaska-native-news.com/july-11th-1921/43277/
#11 #1921 #blockhouse #fortress #geodetic #july #observatory #russian #sitka #torn down

Rampant Groundwater Pumping Has Changed the Tilt of Earth’s Axis
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https://www.scientificamerican.com/article/rampant-groundwater-pumping-has-changed-the-tilt-of-earths-axis/ <-- shared technical article
--
https://doi.org/10.1029/2023GL103509 <-- shared paper
--
“ • Earth's pole has drifted toward 64.16°E at a speed of 4.36 cm/yr during 1993–2010 due to groundwater depletion and resulting sea level rise

• Including groundwater depletion effects, the estimated drift of Earth's rotational pole agrees remarkably well with observations…”
--
#GIS #spatial #mapping #geodetic #geodesy #earth #water #research #earthaxis #axis #pole #gravity #remotesensing #groundwater #pumping #global #waterresources #watersecurity #watersupply #sealevelrise #subsidence #earthobservation #aquifer

Rampant Groundwater Pumping Has Changed the Tilt of Earth’s Axis
--
https://www.scientificamerican.com/article/rampant-groundwater-pumping-has-changed-the-tilt-of-earths-axis/ <-- shared technical article
--
https://doi.org/10.1029/2023GL103509 <-- shared paper
--
“ • Earth's pole has drifted toward 64.16°E at a speed of 4.36 cm/yr during 1993–2010 due to groundwater depletion and resulting sea level rise

• Including groundwater depletion effects, the estimated drift of Earth's rotational pole agrees remarkably well with observations…”
--
#GIS #spatial #mapping #geodetic #geodesy #earth #water #research #earthaxis #axis #pole #gravity #remotesensing #groundwater #pumping #global #waterresources #watersecurity #watersupply #sealevelrise #subsidence #earthobservation #aquifer

Hidden Vulnerability Of US Atlantic Coast To Sea-Level Rise Due To Vertical Land Motion
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https://doi.org/10.1038/s41467-023-37853-7 <-- shared paper
--
#GIS #spatial #mapping #climatechange #sealevelrise #SLR #data #AtlanticCoast #risk #hazard #elevation #subsidence #rates #land #remotesensing #geodesy #geodetic #satellite #coast #coastal #landcover #vulnerability #marshes #coastalmarshes #wetlands #environmental #risk #hazard #vulnerability #vulnerabilitymanagement #mitigation #spatialanalysis #spatiotemporal #model #modeling #vertical #land #motion

Hidden Vulnerability Of US Atlantic Coast To Sea-Level Rise Due To Vertical Land Motion
--
https://doi.org/10.1038/s41467-023-37853-7 <-- shared paper
--
#GIS #spatial #mapping #climatechange #sealevelrise #SLR #data #AtlanticCoast #risk #hazard #elevation #subsidence #rates #land #remotesensing #geodesy #geodetic #satellite #coast #coastal #landcover #vulnerability #marshes #coastalmarshes #wetlands #environmental #risk #hazard #vulnerability #vulnerabilitymanagement #mitigation #spatialanalysis #spatiotemporal #model #modeling #vertical #land #motion

Orogeny update: Experimenting with adding some lat/long grids to the inset map. I like how it emphasizes the properties of the different projections, but I'm not sure it's worth it.

But time for bed now.

#cartography #geodetic #tectonics #gamedev

Orogeny update: Experimenting with adding some lat/long grids to the inset map. I like how it emphasizes the properties of the different projections, but I'm not sure it's worth it.

But time for bed now.

#cartography #geodetic #tectonics #gamedev

A New Coordinate System for Constructing Spherical Grid Systems
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https://doi.org/10.3390/app10020655 <-- shared paper
--
[the math is way above my skills, but a fascinating paper regardless]
#GIS #spatial #mapping #spatialgrids #spherical #framework #sphericalframework #areacoordinates #spatialdata #coordinate #coordinatesystem #projection #mapprojection #singularity #mapprojection #gridsystems #cartography #grid #mapgrid #geodesy #geodetic

A New Coordinate System for Constructing Spherical Grid Systems
--
https://doi.org/10.3390/app10020655 <-- shared paper
--
[the math is way above my skills, but a fascinating paper regardless]
#GIS #spatial #mapping #spatialgrids #spherical #framework #sphericalframework #areacoordinates #spatialdata #coordinate #coordinatesystem #projection #mapprojection #singularity #mapprojection #gridsystems #cartography #grid #mapgrid #geodesy #geodetic

A post got me thinking of this and I’d read that the longest possible unbroken #geodetic sea-going trip was from #Pakistan to #Siberia and probably not in the way you’d perhaps think.

https://www.cntraveler.com/stories/2014-04-07/twenty-thousand-mile-great-circle-sail-maphead