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  • Geodetics - NASA Earthdata
    Geodetics, or geodesy, is the science of studying Earth’s shape, gravity and its effect on phenomena such as polar motion, waterbody tides, and tectonic motion in three-dimensional space over time
  • Space Geodesy Techniques - NASA Earthdata
    Data provided by space geodesy techniques are used to support scientific and societal applications in areas such as Earth observations, positioning, navigation, and timing
  • Global Navigation Satellite System (GNSS) Satellite Data from NASA . . .
    Concept ID C1000000024-CDDIS Data State ACTIVE Number of Files Granules 0 Processing Level 1 Published 2002-01-01 Updated 2012-06-14 Science Keywords Geodetics, GNSS (Global Navigation Satellite Systems) Ground-Based Global Navigation Satellite System (GNSS) Satellite data
  • Visible Infrared Imaging Radiometer Suite | NASA Earthdata
    NASA's Visible Infrared Imaging Radiometer Suite (VIIRS) collects visible and infrared imagery along with global observations of Earth’s land, atmosphere, cryosphere, and ocean
  • Physical Oceanography DAAC | NASA Earthdata
    NASA's Physical Oceanography Distributed Active Archive Center manages and provides tools and services for NASA's oceanographic and hydrologic data
  • Global Navigation Satellite Systems (GNSS) Ultra-Rapid . . . - Earthdata
    Precise satellite orbits derived from analysis of Global Navigation Satellite System (GNSS) data Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce precise orbits identifying the position and velocity of the GNSS satellites These orbits are determined sub-daily (ultra-rapid generation), daily (rapid generation), and weekly (final
  • Daily 30-second Combined GPS Broadcast Ephemeris data
    Description This dataset consists of ground-based Global Navigation Satellite System (GNSS) GPS Combined Broadcast Ephemeris Data (daily files of all distinct navigation messages received in one day) from the NASA Crustal Dynamics Data Information System (CDDIS) GNSS satellites provide autonomous geo-spatial positioning with global coverage GNSS data sets from ground receivers at the CDDIS
  • Very Long Baseline Interferometry (VLBI) data from NASA CDDIS
    Description Very Long Baseline Interferometry (VLBI) is a geometric technique: it measures the time difference between the arrival at two Earth-based antennas of a radio wavefront emitted by a distant quasar VLBI precisely locates points on Earth by comparing radio signals from a quasar radio source located in deep space received at different times at different Earth ground stations This
  • Doppler Orbitography and Radiopositioning Integrated by Satellite . . .
    Description The Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) was developed by the Centre National d'Etudes Spatiales (CNES) with cooperation from other French government agencies The system was developed to provide precise orbit determination and high accuracy location of ground beacons for point positioning DORIS is a dual-frequency Doppler system that has been
  • Earth Orientation Parameters (EOP) products from the International . . .
    The IERS Rapid Service Prediction Center is the product center of the International Earth Rotation and Reference Systems Service responsible for providing Earth orientation parameters (EOPs) on a rapid turnaround basis This service is primarily intended for real-time users and others needing the highest quality EOP information sooner than is available in the IERS final series (Bulletin B





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