Link to our Data Products Page:
Quick Links to Data Products:
The plates frames are defined using Euler rotation poles found in the supplement of
Kreemer et al., 2014. The table is also separately available
at this link.
The format of the file is latitude(deg), longitude(deg), magnitude (deg/Myr), plate ID. To be entirely consisent with the assumed kinematic model, plate velocity at any latitude and longitude can then be computed using the formulas (B1) and (B2) in Kreemer et al., 2014, where Earth’s radius R = 6371 km.
Each station is associated with one or more tectonic plates, as defined by
Bird, 2002. Every station is on at least one plate, but some stations can have more than one plate associated with them if the second plate is close.
For every station there is at least one large plate in the set assigned to it (the large plates being PA, NA, SA, EU, AF, AN, AU).
A text file that lists the plates associated with each station is available
HERE.
- MIDAS rates in legacy reference frames:
- In NA12 Reference Frame
- In IGS08 Reference Frame
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- More Information:
- MIDAS velocity file format README
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- Download the MIDAS code and examples
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- MIDAS software release notes
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Vertical Land Motion (VLM) Using GPS Imaging:
- Global VLM page, with focus on tide gauges
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- File with GPS constraints at tide gagues (text)
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Downloadable Lists of GPS Data Holdings:
- Download list of GPS station latitude, longitude, and heights
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- Download list of GPS stations sorted (in reverse order) by date added to NGL system (yyyy_ddd)
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- Stations with 24 hour sample rate solutions, final orbits, 2 week latency.
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- Stations with 24 sample rate solutions, rapid orbits, 24 hour latency.
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- Stations with 5 minute sample rate solutions, rapid orbits, 24 hour latency.
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- Stations with 5 minute sample rate solutions, ultra rapid orbints, 1.5 hour latency.
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The linked text files above are updated daily and include: Station Name, Latitude, Longitude, Height, XYZ coordinates, data begin and end dates, number of solutions and station operator original site name.
Database of Potential Step Discontinuities
- Link to master steps database.
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- README for steps database.
Decimal Year Convention:
- Explanation and translation file
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Monuments
For about half of all GPS stations processed at NGL we have been able to extract and tabulate information about the station monuments from the IGS log files.
This information includes description of the monument, its foundation construction, height, depth, and geologic enviroment when available.
This information can be used to assess the factors contributing to station stability, error checking and tracking down issues in the time series, studies of noise characteristics, etc.
This information is now posted in the: Monument Table.
System Status Notes
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(1) Rapid solutions may be degraded starting 2022-11-28 owing to a change in Rapid orbit and clock models from JPL which are now in the IERS 2010/ITRF2020 framework. This causes a slight mismatch with current NGL processing models which will be rectified in mid-2023. Final products are unaffected and remain in the IERS 2010/ITRF2014 framework.
(2) We expect that in 2023 JPL will have computed new Final orbits and clocks, and at that time
we will undertake complete reprocessing of Final products in the IERS 2020/ITRF2020 framework.
New NGL Final products will then be computed and are expected to be complete by early 2024.
Employment Opportunities
Graduate Student Opportunities
We are always interested in hearing from students or potential students in the fields of geodesy, tectonics, geophysics, geomatics, and mathematics who are interested in carrying out research in geodesy while studying for an M.S. or Ph.D in Geophysics at UNR.
Postdoctoral Opportunities
There are currently no advertised openings at the NGL, but we anticipate opening several postdoc positions in the near future.
For further information see:
International Students also see:
