In this directory, there are preliminary GPS time series data for March 11, 2011 M9 Japanese earthquake
Provided by the ARIA team at JPL and Caltech. These files are kinematic precise point positioning solutions using JPL's
GIPSY-OASIS software, including single station bias fixing method, and JPL's orbit and clock products. 


In your use of these time series, please use the following accreditation:
 
"Preliminary GPS time series provided by the ARIA team at JPL and Caltech.
All original GEONET RINEX data provided to Caltech by the Geospatial
Information Authority (GSI) of Japan."


Explanation of name convention for tar files
------------------------

The name of the file gives the Julian Day (e.g. "070"), the solution interval
(e.g., "30min"), and the type of orbits used ("rapid" means JPL Rapid
orbits, "final" is the JPL FLINN final orbits, and "Pfinal" are preliminary
'final' orbits)

Each tar file contains a set of "llh_cal" files for each GEONET site we processed

Explanation of llh_cal files
------------------------

Each file contains set of 3 rows for each solution epoch. They are same solution, in different formats

1st row - lat, lon, height (m), sigma (m)
2nd row ("nev") - north, east, up, sigma in meters (relative to first epoch solution)
3rd row ("est") - north, east, up, sigma in meters (relative to a priori position value)

Columns are:

Year Month Day Hour Min Sec "J2000 seconds"  obs1 obs2 obs3 Sigma Site "row name"

Time tags are in GPS Time (offset from UTC since GPS time is not perturbed by
leap seconds, which meant GPS time was 16 seconds ahead of UTC time at time of
Tohoku earthquake).

For questions, contact ARIA team at aria@jpl.nasa.gov or aria@caltech.edu