This file format, described at, contains a header line, followed by data lines. For example, a particular file at this site has first three lines as follows.

181.589 20100709 140820  -85.336  25.290 N42RF GL10 14    2010-190-15:49:18
  -0.0 27.52 -9.99
  -1.5 27.52 -9.99

where the items on the header line are (1) a year-day (ignored here), (2) YYYYMMDD, (3) HHMMSS, (4) longitude, (5) latitude, (6) aircraft wing number, (7) project name, (8) AXBT channel and (9) AXBT ID. The other lines hold vertical coordinate in metres, temperature and temperature error; -9.99 is a missing-value code. (This formatting information is extracted from a file named readme.axbt that is provided with the data.)

  debug = getOption("oceDebug"),
  missingValue = -9.99,
  encoding = "latin1",



character value naming a file, or a file connection, containing the data.


a flag that turns on debugging. The value indicates the depth within the call stack to which debugging applies.


numerical value that is to be interpreted as NA


a character value that indicates the encoding to be used for this data file, if it is textual. The default value for most functions is "latin1", which seems to be suitable for files containing text written in English and French.


if provided, the action item to be stored in the log. This parameter is typically only provided for internal calls; the default that it provides is better for normal calls by a user.


An xbt object.

See also

Other things related to xbt data: [[,xbt-method, [[<-,xbt-method, as.xbt(), plot,xbt-method, read.xbt(), subset,xbt-method, summary,xbt-method, xbt, xbt-class, xbt.edf


Dan Kelley