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Data source: EPSG
Information source: EPSG Guidance Note 7-2, https://epsg.org
Revision date: 2025-08-24
Remarks: An epoch parameter with a value of -999 is a flag to indicate that the coordinate operation value is to be a user-defined input.
See EPSG Guidance Note 7-2 (IOGP Report 373-07-2), available at https://epsg.org under Support Documentation / Guidance notes.
See EPSG Guidance Note 7-2 (IOGP Report 373-07-2).