Plug and Play For Earth Science

A Free GPS Data Processing and Data Products System

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Citation:

• Henceforth please use the following for citation of data products obtained on our web site:
• 
  
• Blewitt, G., W. C. Hammond, and C. Kreemer (2018), Harnessing the GPS data explosion for interdisciplinary science, Eos, 99, https://doi.org/10.1029/2018EO104623.

Access GPS Time Series:

• Graphical MAP BROWSE with links to station pages.

• Find links to station pages and metadata using station name lists and/or text files:

• Stations with final solutions (24 hours sample rate, ~2 week latency):  ( HTML / TXT )
• Stations with rapid solutions (24 hours sample rate, 24 hour latency):  ( HTML / TXT )
• Stations with rapid solutions (5 minute sample rate, 24 hour latency):  ( HTML / TXT )
• Stations with ultra rapid solutions (5 minute sample rate, ~2 hour latency):  ( HTML / TXT )
• All time series are provided in a global (IGS08) reference frame and in a North America frame (NA12) for stations on the North American Plate.

• Go directly to a station's page:

• http://geodesy.unr.edu/NGLStationPages/stations/<ssss>.sta
• where <ssss> is the station 4-character ID (use caps).

• Search using lat/lon, time period, data type, format, etc.: UNAVCO GSAC

• Find/Access stations and data using UNAVCO web services

• Time series files direct access:

Here <ssss> is the station 4-character ID (use caps), and <plate> is one of: AF, AN, AR, AU, BU, CA, CO, EU, IN, MA, NA, NB, NZ, OK, ON, PA, PM, PS, SA, SB, SC, SL, SO, SU, WL, which designates which plate the station is on or near.

• env format:
http://geodesy.unr.edu/gps_timeseries/tenv3/IGS14/<ssss>.tenv3
or in a tectonic plate frame:
http://geodesy.unr.edu/gps_timeseries/tenv3/plates/<plate>/<ssss>.<plate>.tenv3

• xyz format:
http://geodesy.unr.edu/gps_timeseries/txyz/IGS14/<ssss>.txyz2

• File formats: README xyz and README env

Time Series Plot Files:

• The best way to access plots of all available time series are by visiting the station pages.


• Plots can also be accessed directly if the station 4 character ID and desired and the reference frame are known, e.g.:
• For station P090 solutions in the NA reference frame are plotted at:
• http://geodesy.unr.edu/tsplots/IGS14/plates/NA/TimeSeries/P090.png
• "Cleaned" time series (outliers removed) are also available, e.g.:
• http://geodesy.unr.edu/tsplots/IGS14/plates/NA/TimeSeries_cleaned/P090.png
• For 5 minute rapid plots:
• http://geodesy.unr.edu/tsplots/rapid5min/P090.png
• And 5 minute ultra rapid plots:
• http://geodesy.unr.edu/tsplots/ultra5min/P090.png

Velocity Fields:

• MIDAS velocities are provided for all stations with over 1 year of data. Files are provided in all of the reference frames:
http://geodesy.unr.edu/velocities/midas.IGS14.txt
• NA
• IGS14
• README for MIDAS file data format
• Citation for these files available here (open access!) (Blewitt et al., 2016)

Steps Database:

• File includes known equipment change events and potential earthquake steps
• Database (large text file)
• Steps file README

Data Processing Quality Assurance Files:

Useful for assessing solution quality and debugging issues with processing
• Example: the .tar file of all QA files for site P090 is available at: http://geodesy.unr.edu/gps_timeseries/qa/P090.qa.gz
• Detailed Documentation of the QA files

Decimal Year Convention

• Translation file (text with DDMMMYY yyyy.yyyy)
• Explanation of the convention

Access Using Your Own Software and Workflow

• Most data products (e.g. time series, summary files, steps) are available as text files and are updated daily to weekly.
• In many cases files are machine readable, and can be obtained using wget/curl commands in scripts for incorporation into your local analyses.

Troposphere Products

• To make updating and transfer managable the troposphere files are packaged into yearly tar files.
• The format for the url is: http://geodesy.unr.edu/gps_timeseries/trop/<ssss>/<ssss>.<yyyy>.trop.zip
• An example link is for station QUIN's files for the year 2020: http://geodesy.unr.edu/gps_timeseries/trop/QUIN/QUIN.2020.trop.zip
• The Troposphere file format README file contains a brief explanation of these files.
• Link to IGS SINEX troposphere file format

GPS Data Processing Strategy

• Summary Description

Acknowledgements

• Plug and Play GPS is funded by NASA under project NNX14AJ52A, Plug and Play GPS for Earth Scientists: Providing Immediate Access to Low-Latency Geodetic Products for Rapid Modeling and Analysis of Natural Hazards
• Also see our Acknowledgements Page