NAME

       grdinfo - Get information about the contents of a 2-D grd file


SYNOPSIS

       grdinfo grdfiles [ -C ] [ -D ] [ -F ] [ -L1 ] [ -L2 ] [ -M ] [ -V ]


DESCRIPTION

       grdinfo  reads a 2-D binary grd file and reports various statistics for
       the (x,y,z) data in the grdfile. The output  information  contains  the
       minimum/maximum  values  for x, y, and z, where the min/max of z occur,
       the x- and y-increments, and the number of x and y nodes, and  [option-
       ally]  the  mean, standard deviation, and/or the median, L1 scale of z,
       and number of nodes set to NaN.

       grdfile
              The name of one or several 2-D grd files.



OPTIONS

       No space between the option flag and the associated arguments.

       -C     Formats the report using tab-separated fields on a single  line.
              The  output  is  w e s n z0 z1 dx dy nx ny [ x0 y0 x1 y1 ] [ med
              scale ] [ mean std rms] [n_nan].  The data in brackets are  out-
              put  only  if the corresponding options -M, -L1, -L2, and -M are
              used, respectively.

       -D     Report grid domain and x/y-increments using dd:mm:ss[.fff] nota-
              tion [Default is decimal].  Does not apply to the -C option.

       -F     Report  grid  domain  and  x/y-increments  world  mapping format
              [Default is generic].  Does not apply to the -C option.

       -L1    Report median and L1 scale of z (L1  scale  =  1.4826  *  Median
              Absolute Deviation (MAD)).

       -L2    Report mean and standard deviation of z.

       -M     Find  and report the location of min/max z-values, and count and
              report the number of nodes set to NaN, if any.

       -V     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].


EXAMPLES

       To   obtain   all   the   information   about  the  data  set  in  file
       hawaii_topo.grd, try

       grdinfo -L1 -L2 -M hawaii_topo.grd


SEE ALSO

       gmt(l), grd2cpt(l), grd2xyz(l), grdedit(l)



GMT3.4.6                          1 Jan 2005                        GRDINFO(l)

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