NC2XY(1) Generic Mapping Tools NC2XY(1)NAMEnc2xy - Converting netCDF column file(s) to ASCII xy data
SYNOPSISnc2xy files [ -Fvar1/var2/... ] [ -S[r] ] [ -V ] [ -fcolinfo ] [ -bo ]
DESCRIPTIONnc2xy reads one or more netCDF files with column data and writes out
those columns in ASCII format to standard output, so that they can be
used by psxy, psxyz, or xyz2grd. Modify the precision of the ASCII
output format by editing the D_FORMAT parameter in your .gmtdefaults4
file or use --D_FORMAT=value on the command line.
files Names of netCDF files to be converted.
OPTIONS-F Specify up to 10 names of the variables (separated by slashes)
to be printed out. All variables to be 1-dimensional and be of
equal length. When omited, the first two variables in the netCDF
file will be printed.
-S Suppress output for records with one or more NaN values [Default
outputs all nodes]. Append r to reverse the suppression, i.e.,
only output the records with at least one NaN value.
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-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.
-f Special formatting of input and/or output columns (time or geo‐
graphical data). Specify i or o to make this apply only to
input or output [Default applies to both]. Give one or more
columns (or column ranges) separated by commas. Append T (abso‐
lute calendar time), t (relative time in chosen TIME_UNIT since
TIME_EPOCH), x (longitude), y (latitude), or f (floating point)
to each column or column range item. Shorthand -f[i|o]g means
-f[i|o]0x,1y (geographic coordinates). See also TIME COORDI‐
NATES below.
TIME COORDINATES
Time coordinates in netCDF files will be recognized as such. The vari‐
able's unit attribute is parsed to determine the unit and epoch of the
time coordinate in the grid. Values are then converted to the internal
time system specified by TIME_UNIT and TIME_EPOCH in the .gmtdefaults
file or on the command line. The default output is relative time in
that time system, or absolute time when using the option -f0T, -f1T,
etc.
EXAMPLES
To print out latitude, longitude and height in a netCDF file as ASCII
records, while suppressing all NaN values:
nc2xy-F lat/lon/height -S trackfile.nc > trackfile.xy
SEE ALSOgmtdefaults(1), GMT(1), psxy(1), psxyz(1), xyz2grd(1)GMT 4.5.14 1 Nov 2015 NC2XY(1)
