GGP Repair Codes - updated 6 September 2011

 

The following information is extracted from Newsletter #5 ggpnews5.pdf 10 September 1997

 

An update concerning hourly files is extracted from Newsletter #19a ggpnews19a.pdf 22 May 2009

 

A GGP filename is of the form xxyymmcc.ggp, where

 

xx = station name (e.g. ST)

yy = year (e.g. 07)

mm = month (e.g. 03)

cc = repair code (e.g. 00)

 

The repair code is used to specify what has happened to the data. It generally means one of 3 things:

Code   

 significance

 

00   

raw data (as recorded), decimated to 1 min

no repair prior to decimation (GGP STANDARD). As of September 2008, it was agreed that very short gaps or spikes shorter than about 10 sec can be filled by linear interpolation between good data points on the raw data (full signal), prior to decimation. This will avoid unnecessary spreading of minor problems through the filtering and decimation procedure to 1 minute data. Data (gravity and pressure) processed in this way can still be given the '00' code.

01    

gaps and disturbances filled with synthetic signal

repair done on raw data, before decimation to 1 min

02 

as 01 + offsets adjusted

as above...

11

gaps and disturbances filled with synthetic signal

repair done by station operator on data after decimation to 1 min

12

as 11 + offsets adjusted

as above ...

21

gaps and disturbances filled with synthetic signal

repair done by staff at ICET*, prior to tidal analysis

22

as 21 + offsets adjusted

as above ...

h1

data processed by user

one hour data decimated from 1 min

h2

data processed by ICET*

as above, but done by staff at ICET*

 

*International Center for Earth Tides. Note the data is already multiplied by the appropriate calibration factors.

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