NASA will be performing network maintenance on Wednesday, November 20, 2024, between 11:00 AM EST and 1:00 PM EST (16:00 to 18:00 UTC). There will be two periods of about five minutes of disruption. During these peroids, the ILRS website will be unavailable during the outages. If you experience problems outside this window, contact support-cddis@nasa.gov.

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Site Information

  • The Station Table provides identifiers which have been assigned to ILRS stations. These include:
    • 4 digit CDP monument/pad ID number or system reference point
    • 4 character code (typically ends in an L for Laser)
    • Site Location Name and Country
    • Site Occupation Designators (SODs), maintained by the CDDIS
    • Directory of MERIT Sites (DOMES numbers), maintained by the IERS
    • ILRS Site and System Information Forms (Site Logs)

    Additional detail available for specific stations includes:
    • Stations currently or recently upgraded

  • Site Log Viewer - View information in individual site logs or across all site logs
  • SLR Station Coordinates (SLRF2020)
  • SLR System Eccentricities (Up, North, East and X, Y, Z), maintained by the ILRS CB and by the CDDIS
  • SLR System Configuration Files, maintained by the ILRS systems
  • Satellite-Dependent System Configuration and Center of Mass (CoM) correction files
  • Data Corrections (pre-1999, post-1999), maintained by the ILRS CB

    Definitions:

    • SOD is an eight digit code to uniquely describe an occupation of a geodetic monument.
    • DOMES is a nine character code to unambiguously identify a geodetic instrument reference point and/or geodetic marker
    • MERIT is Monitoring of Earth Rotation and Intercomparison of Techniques campaign from the early 1980s
    • SINEX file is a System Independent data Exchange format
    • System eccentricities are the offsets from the geodetic monument (if one exists) to the optical reference point.