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Importing Rinex data from Ordnance Survey in the UK

  • 1.  Importing Rinex data from Ordnance Survey in the UK

    Posted 10-16-2022 07:28
    Recently the OS has changed the way it formats Rinex data.
    It now supplies it in 1 hour segments per base.
    When you drag the Rinex data into a job it hangs up unless you strip the .rnx files from the Rinex zip file.
    Once you have stripped the zip file and dragged it onto the project it works.
    However once it gets past the initial screen of showing what it is importing it takes an age to import the data.
    I have had to wait almost an hour to import it into a project containing 7000 points taken with an R10 receiver.
    Anybody have any ideas why the import and application of the Rinex zip file is taking so long ???
    Any help would be appreciated

    ------------------------------
    Mark Atkinson
    ------------------------------


  • 2.  RE: Importing Rinex data from Ordnance Survey in the UK

    Posted 10-20-2022 02:21
    Hello Mark,

    The OS zip download contains data in both RINEX version 2 and version 3 format (.rnx extension). You can use either type with more recent versions of TBC, so you have to pick which file type you wish to use.  if you have an older copy of TBC it may not support the newer .rnx file type.   

    Although you can bring zip files into TBC, I prefer unzipping first and then dragging in only the files required. 

    The data processing time must be down to the process you are applying and the PC specification. More info would be need on that in order to provide any advice.

    From the OS web site:

    RINEX file naming conventions

    RINEX 2 format files

    nnnnDDDS.YYt[.cmp]
    where:
    nnnn = 4 character station ID
    DDD = 3 digit day of year (inc. leading zeros) of first epoch of data in the file
    S = Hourly session ID letter corresponding to first epoch of data in the file.
    "a" = 00:00:00 - 00:59:59 (GPS time); "b" = 01:00:00 - 01:59:59; …. ;
    "x" = 23:00:00 - 23:59:59
    YY = 2 digit year (inc. leading zero) of first epoch of data in the file
    t = File contents indicator. "o" = observations; "d" = Hatanaka compacted observations;
    "n" = GPS orbits; "g" = GLONASS orbits
    cmp = [Optional] Compression method. E.g. "zip", "gz"

    RINEX 3 format files

    nnnnMRCCC_S_YYYYDDDHHMM_PPU_FFU_CT.fmt[.cmp]
    where:
    nnnn = 4 character station ID
    M = Monument number. Currently only zero (0) is used
    R = Receiver number. Currently only zero (0) is used
    CCC = ISO country code (GBR)
    S = Data source. "R" = receiver; "S" = stream; "U" = unknown
    YYYY = 4 digit year of first epoch of data in the file
    DDD = 3 digit day of year (inc. leading zeros) of first epoch of data in the file
    HH = 2 digit hour (inc. leading zero) of first epoch of data in the file (GPS Time)
    MM = 2 digit minute (inc. leading zero) of first epoch of data in the file (GPS Time)
    PP = 2 digit file period (inc. leading zero)
    U = Units of period PP. "M" = min; "H" = hour, "D" = day; "Y" = years;
    "U" = unspecified
    FF = 2 digit frequency of the observations (inc. leading zero)
    U = Units of frequency FF. "C" = 100Hz; "Z" = Hz; "S" = sec; "M" = min;
    "H" = hour; "D" = day; "U" = unspecified
    NB - _FFU is omitted for files containing navigation data
    C = Constellation indicator. "M" = mixed; "G" = GPS; "E" = Galileo;
    "R" = GLONASS; "C" = Beidou; "J" = QZSS; "I" = IRNSS; "S" = SBAS
    T = Data type indicator. "O" = observations; "N" = navigation;
    "M" = meteo (no associated constellation so MM)
    fmt = File format indicator. "rnx" = RINEX; "crx" = Hatanaka compacted RINEX
    cmp = [Optional] Compression method. E.g. "zip", "gz"

    Example
    One hour of data from station LEED, 29th July 2021 (DoY 210), starting 09:00 (GPS time), 30 second data rate,
    mixed constellation, zip compressed.]

    RINEX 2 filename = LEED210j.21o.zip
    RINEX 3 filename = LEED00GBR_S_20212100900_01H_30S_MO.rnx.zip


    ------------------------------
    Richard Selby
    ------------------------------



  • 3.  RE: Importing Rinex data from Ordnance Survey in the UK

    Posted 10-20-2022 03:02
    Thanks for the update.
    We are deleting the .rnx files from the zip file prior to dragging it across to the job. 
    We are running the version 5.70 of tbc on a decent spec computer.
    Prior to the OS changing the format after dropping the zip file onto the job it would perhaps take 5 minutes or so to apply it to the job on a job of 5000 points or so. Now it can take anywhere up to an hour.
    I appreciate the format from the os is different now but it shouldn't contain any more data. 

    Regards
    Mark Atkinson
    (Quality Manager for Academy Geomatics)





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