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X2SYS_LIST(1) Generic Mapping Tools X2SYS_LIST(1)
NAME
x2sys_list - Output a subset of crossovers from data base
SYNOPSIS
x2sys_list -Ccolumn -TTAG [ coedbase.txt ] [ -Aasymm_max ] [
-FacdhiInNtTvwxyz ] [ -I[list] ] [ -L[corrtable] ] [ -Nnx_min ] [ -Qe|i
] [ -Rwest/east/south/north[r] ] [ -S[*]track ] [ -V ] [ -W[list] ] [
-bo[s|S|d|D[ncol]|c[var1/...]] ] [ -m[flag] ]
DESCRIPTION
x2sys_list will read the crossover ASCII data base coedbase.txt (or
stdin) and extract a subset of the crossovers based on the other
arguments. The output may be ASCII or binary.
-C Specify which data column you want to process. Crossovers
related to this column name must be present in the crossover
data base.
-T Specify the x2sys TAG which tracks the attributes of this data
type.
OPTIONS
No space between the option flag and the associated arguments.
coedbase.txt
The name of the input ASCII crossover error data base as
produced by x2sys_cross. If not given we read standard input
instead.
-A Specifies maximum asymmetry in the distribution of crossovers
relative to the mid point in time (or distance, if time is not
available). Asymmetry is computed as (n_right -
n_left)/(n_right + n_left), referring the the number of
crossovers that falls in the left or right half of the range.
Symmetric distributions will have values close to zero. If
specified, we exclude tracks whose asymmetry exceeds the specify
cutoff in absolute value [1, i.e., include all].
-F Specify your desired output using any combination of
acdhiInNtTvwxyz, in any order. Do not use space between the
letters, and note your selection is case-sensitive. The output
will be ASCII (or binary, see -bo) columns of values.
Description of codes: a is the angle (< 90) defined by the
crossing tracks, c is crossover value of chosen observation (see
-C), d is distance along track, h is heading along track, i is
the signed time interval between the visit at the crossover of
the two tracks involved, I is same as i but is unsigned, n is
the names of the two tracks, N is the id numbers of the two
tracks, t is time along track in dateTclock format (NaN if not
available), T is elapsed time since start of track along track
(NaN if not available), v is speed along track, w is the
composite weight, x is x-coordinate (or longitude), y is
y-coordinate (or latitude), and z is observed value (see -C)
along track. If -S is not specified then d,h,n,N,t,T,v results
in two output columns each: first for track one and next for
track two (in lexical order of track names); otherwise, they
refer to the specified track only (except for n,N which then
refers to the other track). The sign convention for c,i is
track one minus track two (lexically sorted). Time intervals
will be returned according to the TIME_UNIT GMT defaults
setting.
-I Name of ASCII file with a list of track names (one per record)
that should be excluded from consideration [Default includes all
tracks].
-L Apply optimal corrections to the chosen observable. Append the
correction table to use [Default uses the correction table
TAG_corrections.txt which is expected to reside in the
$X2SYS_HOME/TAG directory]. For the format of this file, see
x2sys_solve.
-N Only report data from pairs that generated at least nx_min
crossovers between them [use all pairs].
-Q Append e for external crossovers or i for internal crossovers
only [Default is all crossovers].
-R west, east, south, and north specify the Region of interest, and
you may specify them in decimal degrees or in
[+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r if lower left and
upper right map coordinates are given instead of w/e/s/n. The
two shorthands -Rg and -Rd stand for global domain (0/360 and
-180/+180 in longitude respectively, with -90/+90 in latitude).
Alternatively, specify the name of an existing grid file and the
-R settings (and grid spacing, if applicable) are copied from
the grid. For Cartesian data just give xmin/xmax/ymin/ymax.
This option limits the COEs to those that fall inside the
specified domain.
-S Name of a single track. If given we restrict output to those
crossovers involving this track [Default output is crossovers
involving any track pair]. Prepend a '+' to make it print info
relative to both tracks [Default is selected track]. This
applies only to common information such as distance, time,
heading (see -F for details).
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-W Name of ASCII file with a list of track names and their relative
weights (one track per record) that should be used to calculate
the composite crossover weight (output code w above). [Default
sets weights to 1].
-bo Selects binary output. Append s for single precision [Default
is d (double)]. Uppercase S or D will force byte-swapping.
Optionally, append ncol, the number of desired columns in your
binary output file.
-m Multiple segment output format. Segments with crossovers for a
single track pair are separated by a record whose first
character is flag and contains the two track names. [Default is
'>'].
EXAMPLES
To find all the magnetic crossovers associated with the tag MGD77 from
the file COE_data.txt, restricted to occupy a certain region in the
south Pacific, and return location, time, and crossover value, try
x2sys_list COE_data.txt -V -T MGD77 -R 180/240/-60/-30 -C mag -F xytz >
mag_coe.txt
To find all the faa crossovers globally that involves track 12345678
and output time since start of the year, using a binary double
precision format, try
x2sys_list COE_data.txt -V -T MGD77 -C faa -S 12345678 -F Tz -bod >
faa_coe.b
SEE ALSO
x2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_get(1),
x2sys_init(1), x2sys_put(1), x2sys_report(1), x2sys_solve(1)
GMT 4.5.14 1 Nov 2015 X2SYS_LIST(1)