Provided by: gmt_4.5.11-1build1_amd64 bug

NAME

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

SYNOPSIS

       grdinfo  grdfiles  [  -C  ]  [  -F ] [ -I[dx[/dy]] ][ -L[0|1|2] ] [ -M ] [ -Tdz ] [ -V ] [
       -f[i|o]colinfo ]

DESCRIPTION

       grdinfo reads a 2-D binary grid file and reports various statistics for the  (x,y,z)  data
       in the grid file(s).  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  [optionally]  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 grid files.  (See GRID FILE FORMATS below.)

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 output only if the corresponding options -M, -L1, -L2, and  -M
              are  used, respectively.  If the -I option is used, the output format is instead NF
              w e s n z0 z1, where NF is the total number of grids read and w e s n  are  rounded
              off (see -I).

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

       -I     Report the min/max of the region to the nearest multiple of dx and dy,  and  output
              this  in  the form -Rw/e/s/n (unless -C is set).  To report the actual grid region,
              select -I-.  If no argument is given then we report the grid increment in the  form
              -Ixinc/yinc.

       -L0    Report  range  of  z  after actually scanning the data, not just reporting what the
              header says.

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

       -L2    Report mean, standard deviation, and rms 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.

       -T     Determine min and max z-value, round off to multiples of dz, and report as the text
              string -Tzmin/zmax/dz for use by makecpt.

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

       -f     Special formatting of input and/or output  columns  (time  or  geographical  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
              (absolute 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).

GRID FILE FORMATS

       GMT  is  able  to  recognize  many  of the commonly used grid file formats, as well as the
       precision, scale and offset of the values contained in the grid file.  When  GMT  needs  a
       little help with that, you can add the suffix =id[/scale/offset[/nan]], where id is a two-
       letter identifier of the grid type and precision, and scale and offset are optional  scale
       factor  and offset to be applied to all grid values, and nan is the value used to indicate
       missing data.  See grdreformat(1) and Section 4.17 of  the  GMT  Technical  Reference  and
       Cookbook for more information.

       When  reading  a  netCDF file that contains multiple grids, GMT will read, by default, the
       first 2-dimensional grid that can find in that file. To  coax  GMT  into  reading  another
       multi-dimensional  variable  in  the  grid  file,  append ?varname to the file name, where
       varname is the name of the variable. Note that you may need to escape the special  meaning
       of  ?  in  your  shell  program  by  putting a backslash in front of it, or by placing the
       filename and suffix between quotes or double quotes.  See grdreformat(1) and Section  4.18
       of  the  GMT Technical Reference and Cookbook for more information, particularly on how to
       read splices of 3-, 4-, or 5-dimensional grids.

EXAMPLES

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

       grdinfo -L1 -L2 -M hawaii_topo.grd

SEE ALSO

       GMT(1), grd2cpt(1), grd2xyz(1), grdedit(1)