Data Usage Guidance/RestrictionsThe operational data for this datatype is available to all registered CLASS users. Pre-operational data may be restricted to authorized users. To become an authorized user, send a request to the CLASS Help Desk. |
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Dataset NameA User Ephemeris File (UEF) contains orbit vectors that cover a 10 day time span. An updated UEF file is received each day. The UEF is the foundation for all the navigation data produced in IPD. It is utilized to create the TBUS bulletins, the equator crossing information files, the Search and Rescue (SAR) orbit ephemeris files, and level 1B instrument data files. |
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Inventory IDA unique numerical ID assigned to the data set for CLASS inventory purposes. |
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SatelliteThe satellite that acquired the UEF data.
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TemporalRefers to the time span of interest to the user. This section of the search page allows the user to define the range of dates/times of interest. |
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UTCCoordinated Universal Time (UTC) is the international time standard. It is the current term for what was referred to as Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight in Greenwich England, which lies on the zero longitudinal meridian. Universal time is based on a 24 hour clock, therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC (sixteen hours, zero minutes). |