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#geodetic β€” Public Fediverse posts

Live and recent posts from across the Fediverse tagged #geodetic, aggregated by home.social.

  1. 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:
    universeodon.com/@KrajciTom/11

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

    "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

  2. 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:
    universeodon.com/@KrajciTom/11

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

    "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

  3. 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:
    universeodon.com/@KrajciTom/11

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

    "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

  4. 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:
    universeodon.com/@KrajciTom/11

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

    "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

  5. 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:
    universeodon.com/@KrajciTom/11

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

    "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

  6. "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

  7. "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

  8. "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

  9. "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

  10. "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

  11. " #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) β€” the backbone of the world’s geodetic infrastructure β€” Canada looks no different from Africa..." gogeomatics.ca/canadas-geodesy

  12. " #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) β€” the backbone of the world’s geodetic infrastructure β€” Canada looks no different from Africa..." gogeomatics.ca/canadas-geodesy

  13. " #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) β€” the backbone of the world’s geodetic infrastructure β€” Canada looks no different from Africa..." gogeomatics.ca/canadas-geodesy

  14. " #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) β€” the backbone of the world’s geodetic infrastructure β€” Canada looks no different from Africa..." gogeomatics.ca/canadas-geodesy

  15. " #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) β€” the backbone of the world’s geodetic infrastructure β€” Canada looks no different from Africa..." gogeomatics.ca/canadas-geodesy

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

    #geodesy

    πŸ“·S.HΓΆcht

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

    #geodesy

    πŸ“·S.HΓΆcht

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

    #geodesy

    πŸ“·S.HΓΆcht

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

    #geodesy

    πŸ“·S.HΓΆcht

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

    #geodesy

    πŸ“·S.HΓΆcht

  21. As A USGS Employee Working In Spatial Data: hehehehehehehehe
    --
    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

  22. As A USGS Employee Working In Spatial Data: hehehehehehehehe
    --
    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

  23. As A USGS Employee Working In Spatial Data: hehehehehehehehe
    --
    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

  24. As A USGS Employee Working In Spatial Data: hehehehehehehehe
    --
    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

  25. As A USGS Employee Working In Spatial Data: hehehehehehehehe
    --
    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."

    @XKCD

  26. 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: doi.org/10.26443/seismica.v3i1

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

  27. 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: doi.org/10.26443/seismica.v3i1

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

  28. 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: doi.org/10.26443/seismica.v3i1

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

  29. 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: doi.org/10.26443/seismica.v3i1

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

  30. 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: doi.org/10.26443/seismica.v3i1

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