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GPS TIME SERIES SCHEMA - SUPPORTED FORMATS
GPS GML Schema
Information about supported GPS data formats can be found in
http://www.scign.org
Current GML Seismicity Schema supports 3 formats
JPL Time series for all sites
SOPAC Time series for all sites
USGS Rapid analysis results
Format Specifications - Info about the columns of each catalog
Time series are given as three ascii files SITE.lat, SITE.lon, and
SITE.rad containing the time in years, estimate in cm, sigma in cm, site,
component, and date. Stacov files contain X, Y, Z estimates in m, sigmas in m,
and correlations.
Col Comment
1: time [in years]
2: estimate [in cm]
3: sigma [in cm]
4: site
5: component
6: date
[File 70DM.lat]
time in years estimate in cm sigma in cm, site component date
2001.6427 0.480731548657252E-01 0.190967658896982E+00 7ODM LAT 01AUG23
2001.6455 -0.411582988507547E-02 0.115527109363862E+00 7ODM LAT 01AUG24
2001.6482 0.618315231694152E-01 0.120494136411178E+00 7ODM LAT 01AUG25
There is metadata about the GPS sites, corresponding to the file names in ./point and ./filtered, in the files ./table.txt and ./table2.txt.
It looks like the distinction is that table.txt contains cartesian coordinates for each station, while table2.txt has this expressed in latitude
and longitude (in a particular reference frame system). (Jay W. Parker)
> 2) Are columns of .lat, .lon,.rad relative postion with respect to
> table2.txt positions in cm, then uncertainty (1-sigma uncertainty?) also
> in cm?
The columns of .lat, .lon, and .rad are relative to the position
in table2.txt which has an epoch of July 1, 2003. The positions and
velocities in table2.txt were estimated by fitting all the data for a
particular site.
>
> 3) so table2.txt has height in mm above ellipsoid (essentially like sea
> level ?) and errors (1 sigma?) are in mm for all types. What are these
> estimates and errors based on? (is this the average postition over the
> data we collected at some point, with "error" based on the error of each
> day's position over root-N?)
Yes, the height estimates are given relative to the WGS84 reference
ellipsoid. The dailt formal errors have been multiplied by 3 so that
chi^2/dof is roughly 1 for each site when doing a linear fit. #The reference frame is ITRF2000. The epoch is July 1, 2003.
#The reference ellipsoid for latitude, longitude, and height is WGS84.
#Latitude and longitude are given in degrees. Height is given in mm.
#Latitude, longitude, and height errors are given in mm.
#Velocities and their errors are given in mm/yr.
LAT LON HEIGHT
AGMT POS 34.594281903 -116.429378066 1337851.10 0.20 0.35 0.79
AGMT VEL 0.13 -18.86 4.78 0.10 0.17 0.40
AIS1 POS 55.069072287 -131.599535423 32253.80 0.84 1.09 2.58
AIS1 VEL -12.40 -14.59 1.52 0.31 0.40 0.94
AJAC POS 41.927457067 8.762614171 98769.90 0.34 0.52 1.17
ALBH POS 48.389781214 -123.487470380 31762.50 0.13 0.19 0.44
ALBH VEL -9.32 -8.27 0.80 0.02 0.04 0.09
#The reference frame is ITRF2000. The epoch is July 1, 2003.
#Positions given in mm. Velocities given in mm/yr.
X Y Z
AGMT POS -2339956268.10 -4707748827.06 3601666104.12 0.45 0.62 0.45
AGMT VEL -18.61 4.94 2.82 0.22 0.31 0.22
AIS1 POS -2430153915.65 -2737192932.49 5205816635.55 1.38 1.47 2.12
AIS1 VEL -18.24 1.43 -5.85 0.51 0.53 0.77
AJAC POS 4696989462.34 723994439.61 4239678509.31 0.93 0.53 0.78
Columns
decimal year, year, day-of-year, [x,y,z OR north,east,up (m)], [x,y,z sigma OR n,e,u sigma]
decimal year year day-of-year [x,y,z OR north,east,up (m)] [x,y,z sigma OR n,e,u sigma]
[flt.neu]2001.3055 2001 111 -0.0008 0.0246 -0.0085 0.0082 0.0082 0.0088
[unf.neu]2001.3055 2001 111 0.0007 0.0247 -0.0158 0.0082 0.0082 0.0088
[raw.neu]2001.3055 2001 111 0.0007 0.0247 -0.0158 0.0082 0.0082 0.0088
[raw.xyz]2001.3055 2001 111 -2407750.8841 -4706536.7243 3557571.3937 0.0077 0.0097 0.0076
Columns
Decimal_Year Time StampNorth_(mm)North_error_(mm) East_(mm) East_error_(mm) Up_(mm) Up_error_(mm) Double_Diff_Obs Phase Bias_Flag1 Bias_Flag2 Troposphere North_East_rhoNorth_Up_rho East_Up_rho X X_error Y Y_error Z Z_error
# NOTE: The decimal year values are calculated for each datapoint
# by dividing the decimal day by 365 (or 366 if it's a leap
# year) and adding this to the year. Zero begins at the
# beginning of the day. Positions are generally taken at
# noon each day, although newer datapoints may be subdaily.
# Site Code: AGMT
#
Decimal_Year Time Stamp North_(mm) North_error_(mm) East_(mm) East_error_(mm) Up_(mm) Up_error_(mm) Double_Diff_Obs Phase Bias_Flag1 Bias_Flag2 Troposphere North_East_rho North_Up_rho East_Up_rho X X_error Y Y_error Z Z_error
1999.970318 1999-355:03:59:00 3851017839.9000 3.0000 22319997874.5000 3.7000 1337846.0000 17.6000 -2339956199.2000 7.5000 -4707748860.1000 13.2000 3601666097.0000 10.0000
1999.970320 1999-355:04:00:00 9000.0000
1999.973057 1999-356:03:59:00 3851017841.8000 1.6000 22319997874.2000 2.9000 1337834.5000 9.5000 -2339956194.8000 4.5000 -4707748850.5000 7.1000 3601666092.0000 5.5000
1999.973059 1999-356:04:00:00 3700.0000
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