Portal:Geodesy

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The Geodesy Portal

GPS Block II-F satellite in Earth orbit
GPS Block II-F satellite in Earth orbit

astronomical bodies, such as planets or circumplanetary systems
.

control networks, applying space geodesy and terrestrial geodetic techniques, and relying on datums and coordinate systems. The job titles are geodesist and geodetic surveyor. (Full article...
)

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Selected images

  • Image 1A map of recent volcanic activity and ridge spreading. The areas where NASA GRACE measured gravity to be stronger than the theoretical gravity have a strong correlation with the positions of the volcanic activity and ridge spreading. (from Gravity of Earth)
    A map of recent volcanic activity and ridge spreading. The areas where NASA GRACE measured gravity to be stronger than the theoretical gravity have a strong correlation with the positions of the volcanic activity and ridge spreading. (from Gravity of Earth)
  • Image 2Mapping can be done with GPS and laser rangefinder directly in the field. Image shows mapping of forest structure (position of trees, dead wood and canopy). (from Cartography)
    Mapping can be done with
    GPS and laser rangefinder directly in the field. Image shows mapping of forest structure (position of trees, dead wood and canopy). (from Cartography
    )
  • Image 3Illustrated map (from Cartography)
    Illustrated map (from Cartography)
  • Image 4Earth's gravity measured by NASA GRACE mission, showing deviations from the theoretical gravity of an idealized, smooth Earth, the so-called Earth ellipsoid. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker (Animated version). (from Gravity of Earth)
    Earth's gravity measured by NASA
    GRACE mission, showing deviations from the theoretical gravity of an idealized, smooth Earth, the so-called Earth ellipsoid. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker (Animated version). (from Gravity of Earth
    )
  • Image 5Axial tilt (or Obliquity), rotation axis, plane of orbit, celestial equator and ecliptic. Earth is shown as viewed from the Sun; the orbit direction is counter-clockwise (to the left). (from Geodesy)
    Axial tilt (or
    Obliquity), rotation axis, plane of orbit, celestial equator and ecliptic. Earth is shown as viewed from the Sun; the orbit direction is counter-clockwise (to the left). (from Geodesy
    )
  • Image 6Datum shift between NAD27 and NAD83, in metres (from Geodesy)
    Datum shift between
    NAD83, in metres (from Geodesy
    )
  • Image 7Europa regina in Sebastian Münster's "Cosmographia", 1570 (from Cartography)
    Europa regina in Sebastian Münster's "Cosmographia", 1570 (from Cartography)
  • Image 8Gravity measurement devices, pendulum (left) and absolute gravimeter (right) (from Geodesy)
    Gravity measurement devices, pendulum (left) and absolute gravimeter (right) (from Geodesy)
  • Image 9A 14th-century Byzantine map of the British Isles from a manuscript of Ptolemy's Geography, using Greek numerals for its graticule: 52–63°N of the equator and 6–33°E from Ptolemy's Prime Meridian at the Fortunate Isles. (from Cartography)
    A 14th-century
    Prime Meridian at the Fortunate Isles. (from Cartography
    )
  • Image 10Starry circles arc around the south celestial pole, seen overhead at ESO's La Silla Observatory. (from Earth's rotation)
    Starry circles arc around the south celestial pole, seen overhead at
    ESO's La Silla Observatory. (from Earth's rotation
    )
  • Image 11Areal distortion caused by Mercator projection (from Cartography)
    Areal distortion caused by Mercator projection (from Cartography)
  • Image 12Global plate tectonic movement using GPS (from Geodesy)
    Global plate tectonic movement using GPS (from Geodesy)
  • Image 13A modern instrument for geodetic measurements using satellites (from Geodesy)
    A modern instrument for geodetic
    satellites (from Geodesy
    )
  • Image 14The Bedolina Map and its tracing, 6th–4th century BCE (from Cartography)
    The Bedolina Map and its tracing, 6th–4th century BCE (from Cartography)
  • Image 15On a prograde planet like Earth, the stellar day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360 degrees and the distant star is overhead again but the Sun is not (1→2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). (from Earth's rotation)
    On a
    prograde planet like Earth, the stellar day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360 degrees and the distant star is overhead again but the Sun is not (1→2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). (from Earth's rotation
    )
  • Image 16The definition of latitude (φ) and longitude (λ) on an ellipsoid of revolution (or spheroid). The graticule spacing is 10 degrees. The latitude is defined as the angle between the normal to the ellipsoid and the equatorial plane. (from Geodesy)
    The definition of latitude (φ) and longitude (λ) on an ellipsoid of revolution (or spheroid). The graticule spacing is 10 degrees. The latitude is defined as the angle between the normal to the ellipsoid and the equatorial plane. (from Geodesy)
  • Image 17Equatorial (a), polar (b) and mean Earth radii as defined in the 1984 World Geodetic System (from Geodesy)
    Equatorial (a), polar (b) and mean Earth radii as defined in the 1984 World Geodetic System (from Geodesy)
  • Image 18Ellipsoid - a mathematical representation of the Earth. When mapping in geodetic coordinates, a latitude circle forms a truncated cone. (from Geodesy)
    Ellipsoid - a mathematical representation of the Earth. When mapping in geodetic coordinates, a latitude circle forms a truncated cone. (from Geodesy)
  • Image 19How very-long-baseline interferometry (VLBI) works (from Geodesy)
    How very-long-baseline interferometry (VLBI) works (from Geodesy)
  • Image 20A simulated history of Earth's day length, depicting a resonant-stabilizing event throughout the Precambrian era (from Earth's rotation)
    A simulated history of Earth's day length, depicting a resonant-stabilizing event throughout the Precambrian era (from Earth's rotation)
  • Image 212D grid for elliptical coordinates (from Geodesy)
    2D grid for elliptical coordinates (from Geodesy)
  • Image 22Copy (1472) of St. Isidore's TO map of the world. (from Cartography)
    Copy (1472) of
    TO map of the world. (from Cartography
    )
  • Image 23Surveyor using a total station (from Geomatics)
    Surveyor using a total station (from Geomatics)
  • Image 24This long-exposure photo of the northern night sky above the Nepali Himalayas shows the apparent paths of the stars as Earth rotates. (from Earth's rotation)
    This
    long-exposure photo of the northern night sky above the Nepali Himalayas shows the apparent paths of the stars as Earth rotates. (from Earth's rotation
    )
  • Image 25Variations in the gravity field of the Moon, from NASA (from Geodesy)
    Variations in the gravity field of the Moon, from NASA (from Geodesy)
  • Image 26Plot of latitude versus tangential speed. The dashed line shows the Kennedy Space Center example. The dot-dash line denotes typical airliner cruise speed. (from Earth's rotation)
    Plot of latitude versus tangential speed. The dashed line shows the
    cruise speed. (from Earth's rotation
    )
  • Image 27Relief map Sierra Nevada (from Cartography)
    Relief map Sierra Nevada (from Cartography)
  • Image 28A pre-Mercator nautical chart of 1571, from Portuguese cartographer Fernão Vaz Dourado (c. 1520 – c. 1580). It belongs to the so-called plane chart model, where observed latitudes and magnetic directions are plotted directly into the plane, with a constant scale, as if the Earth were a plane (Portuguese National Archives of Torre do Tombo, Lisbon). (from Cartography)
    A pre-Mercator nautical chart of 1571, from Portuguese cartographer Fernão Vaz Dourado (c. 1520 – c. 1580). It belongs to the so-called plane chart model, where observed latitudes and magnetic directions are plotted directly into the plane, with a constant scale, as if the Earth were a plane (Portuguese National Archives of Torre do Tombo, Lisbon). (from Cartography)
  • Image 29A relative gravimeter (from Geodesy)
    A relative gravimeter (from Geodesy)
  • Image 30GPS Block IIA satellite orbits over the Earth. (from Geodesy)
    GPS Block IIA satellite orbits over the Earth. (from Geodesy
    )
  • Image 31A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy's Geography and using his second map projection. The translation into Latin and dissemination of Geography in Europe, in the beginning of the 15th century, marked the rebirth of scientific cartography, after more than a millennium of stagnation. (from Cartography)
    A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy's Geography and using his second map projection. The translation into Latin and dissemination of Geography in Europe, in the beginning of the 15th century, marked the rebirth of scientific cartography, after more than a millennium of stagnation. (from Cartography)
  • Image 32A Munich archive with lithography plates of maps of Bavaria (from Geodesy)
    A Munich archive with lithography plates of maps of Bavaria (from Geodesy)
  • Image 33Visual fix by three bearings plotted on a nautical chart (from Geopositioning)
    Visual fix by three bearings plotted on a nautical chart (from Geopositioning)
  • Image 34Valcamonica rock art (I), Paspardo r. 29, topographic composition, 4th millennium BCE (from Cartography)
    Valcamonica rock art (I), Paspardo r. 29, topographic composition, 4th millennium BCE (from Cartography)
  • Image 35Principles of geolocation using GPS (from Geopositioning)
    Principles of geolocation using GPS (from Geopositioning)
  • Image 36Gravity at different internal layers of Earth (1 = continental crust, 2 = oceanic crust, 3 = upper mantle, 4 = lower mantle, 5+6 = core, A = crust-mantle boundary) (from Gravity of Earth)
    Gravity at different internal layers of Earth (1 = continental crust, 2 = oceanic crust, 3 = upper mantle, 4 = lower mantle, 5+6 = core, A = crust-mantle boundary) (from Gravity of Earth)
  • Image 37Earth's axial tilt is about 23.4°. It oscillates between 22.1° and 24.5° on a 41,000-year cycle and is currently decreasing. (from Earth's rotation)
    Earth's axial tilt is about 23.4°. It oscillates between 22.1° and 24.5° on a 41,000-year cycle and is currently decreasing. (from Earth's rotation)
  • Image 38Deviation of day length from SI-based day (from Earth's rotation)
    Deviation of day length from SI-based day (from Earth's rotation)
  • Image 39Geoid, an approximation for the shape of the Earth; shown here with vertical exaggeration (10000 vertical scaling factor). (from Geodesy)
    Geoid, an approximation for the shape of the Earth; shown here with vertical exaggeration (10000 vertical scaling factor). (from Geodesy)
  • Image 40Small section of an orienteering map (from Cartography)
    Small section of an orienteering map (from Cartography)
  • Image 41A plumb bob determines the local vertical direction (from Gravity of Earth)
    A plumb bob determines the local vertical direction (from Gravity of Earth)
  • Image 42Topographic map of Easter Island (from Cartography)
    Topographic map of Easter Island (from Cartography)
  • Image 43An artist's rendering of the protoplanetary disk (from Earth's rotation)
    An artist's rendering of the protoplanetary disk (from Earth's rotation)
  • Image 44The Tabula Rogeriana, drawn by Muhammad al-Idrisi for Roger II of Sicily in 1154. South is at the top. (from Cartography)
    The Tabula Rogeriana, drawn by Muhammad al-Idrisi for Roger II of Sicily in 1154. South is at the top. (from Cartography)
  • Image 45Global gravity anomaly animation over oceans from the NASA's GRACE (Gravity Recovery and Climate Experiment) (from Geodesy)
    Global gravity anomaly animation over oceans from the NASA's GRACE (Gravity Recovery and Climate Experiment) (from Geodesy)
  • Image 46Earth's rotation imaged by Deep Space Climate Observatory, showing axis tilt (from Earth's rotation)
    Earth's rotation imaged by Deep Space Climate Observatory, showing axis tilt (from Earth's rotation)
  • Image 47Navigation device, Apollo program (from Geodesy)
    Navigation device, Apollo program (from Geodesy
    )
  • Image 48The cartographic process (from Cartography)
    The cartographic process (from Cartography)
  • Image 49Height measurement using satellite altimetry (from Geodesy)
    Height measurement using satellite altimetry (from Geodesy)
  • Image 50Geodetic control mark (from Geodesy)
    Geodetic control mark (from Geodesy)
  • Image 51Initial acquisition of GPS signal in 2D (from Geodesy)
    Initial acquisition of GPS signal in 2D (from Geodesy)

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Geodesy
Curve fitting
Geodetic datums
Flat Earth
Frames of reference
Geodesists
Geodynamics
Geographic coordinate systems
Global Positioning System
Gravimetry
Hollow Earth
Geodesy-related lists
Surveying and geodesy markers
Meridians (geography)
Geodesy organizations
Satellite navigation systems
Geodetic satellites
Struve Geodetic Arc
Geodetic surveys
Surveying instruments
Geodesy stubs

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