WASHINGTON
Station summaryUSN3
| IGS-type acronym : | USN3 |
| Latitude : | 38.92056472 |
| Longitude : | -77.06627389 |
| Installed date : | 2004-06-28 |
| Decommissioned date : | 2014-11-19 |
| Country : | U.S.A. |
| City: | WASHINGTON |
| Station status : | Decommissioned (white and red cross) |
| Distance to Tide Gauge (m) : | 6525 |
| Domes Nr.: | 40451S007 |
| Station operator: | (USNO) - U.S. Naval Observatory |
| IGS-like station form : |
GPS position times seriesUSN3
(Reference epoch: )
| M | Material change or malfunction |
| E | Earthquake |
| RF | Reference Frame change |
| U | Unknown |
| NA | Not available |
| Position discontinuity | |
| Velocity discontinuity |
Data available at SONELUSN3
Quality plots on RINEX filesUSN3
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Plots generated using software developed with the EPN team at ROB |
| Observations & tracking performance | Satellite tracking |
(this operation may take 20 to 45s)
The satellite tracking graph has been calculated for all stations for the first day of each month. If you wish to have a graph for another date, choose the 'Calculate a specific date' option.
Comparison with satellite altimetry data
- Link to Sea Level Differences (Satellite altimetry minus tide gauge data).
Co-located instrumentsUSN3
- GPS : WASHINGTON (USNO)
- Tide gauge : WASHINGTON DC (WASTG)
- GPS : Washington D.C 3 (WDC3)
- GPS : Washington D.C 4 (WDC4)
- GPS : U.S. Naval Research Laboratory (NRL1)
- GPS : U.S. Naval Observatory Time Service (USN7)
- GPS : USNO NGA colocated 5 (WDC5)
- GPS : USNO NGA colocated 6 (WDC6)
- GPS : U.S. Naval Observatory Time Service (USN9)
- GPS : U.S. Naval Observatory Time Service (USN8)
History of the stationUSN3
USN3 renamed USN7 in nov 2014
Log bookUSN3
[IGSSTATION-6287] - 2015-08-24 (24/08/2015)
Back in November 2014 the antenna mount for USN3/USN4/USN5 was raised 1.5m. At that time USN3 was renamed to USN7. USN4/USN5 should have also been renamed at the same time since all three share the same antenna. The replacement station names for USN4/USN5 are USN8/USN9.
[IGSSTATION-6030] - 2014-11-20 (25/11/2014)
Urgent: USN3 antenna type and location (height) has been significantly changed.
At least one daily 30s file from Nov 18 was unintentionally published
which did not include necessary changes in metadata (RINEX header).
Processing will result in a position that is ~5 -feet- higher than nominal.
Suggest not using any subsequent USN3 data until further notice.
IGS Data centers should remove these erroneous files.
Data will be backfilled with appropriate headers as soon as the entire
scope of the change is fully documented.
