NAME

       grd2xyz - Converting a grdfile to an ASCII or binary table

SYNOPSIS

       grd2xyz  grdfile  [  -H[nrec]  ]  [  -L  ]  [  -Rwest/east/south/north[r] [ -S[r ] [ -V ] [ -Z[flags] ] [
       -bo[s][n] ]

DESCRIPTION

       grd2xyz reads a binary 2-D grdfile and writes out xyz-triplets in ASCII [or binary]  format  to  standard
       output.   Modify  the  precision  of  the  ASCII  output format by editing the D_FORMAT parameter in your
       .gmtdefaults file, or choose binary output using single or double precision storage. As an option you may
       output z-values without the (x,y) in a number of formats, see -Z below.

       grdfile
              The 2-D binary file to be converted.

OPTIONS

       -H     Output 1 header record based on information in the grdfile header.  Ignored if  binary  output  is
              selected. [Default is no header].

       -L     Indicates that the x values are longitudes (necessary for -: to work).

       -R     west,  east, south, and north specify the Region of interest. To specify boundaries in degrees and
              minutes [and seconds], use the dd:mm[:ss] format. Append r if  lower  left  and  upper  right  map
              coordinates are given instead of wesn.

       -S     Suppress  output  for  nodes  whose  z-value  equals NaN [Default outputs all nodes].  Append r to
              reverse the suppression, i.e., only output the nodes whose z-value equals NaN.

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

       -Z     Write a 1-column ASCII [or binary] table. Output will be  organized  according  to  the  specified
              ordering  convention contained in flags.  If data should be written by rows, make flags start with
              T(op) if first row is y = ymax or B(ottom) if first row is y =  ymin.  Then,  append  L  or  R  to
              indicate that first element should start at left or right end of row. Likewise for column formats:
              start  with L or R to position first column, and then append T or B to position first element in a
              row.  For gridline registered grids: If grid is periodic in x but the outcoming  data  should  not
              contain  the  (redundant)  column  at x = xmax, append x. For grid periodic in y, skip writing the
              redundant row at y = ymax by appending y. If the byte-order needs to be swapped, append w.  Select
              one of several data types (all binary except a):

                      a ASCII representation
                      c signed 1-byte character
                      u unsigned 1-byte character
                      h short 2-byte integer
                      i 4-byte integer
                      l long (4- or 8-byte) integer
                      f 4-byte floating point single precision
                      d 8-byte floating point double precision

              Default  format  is  scanline  orientation  of ASCII numbers: -ZTLa.  Note that -Z only applies to
              1-column output.

       -bo    Selects binary output. Append s for single  precision  [Default  is  double].   This  option  only
              applies to xyz output; see -Z for z table output.

EXAMPLES

       To edit individual values in the 5' by 5' hawaii_grv.grd file, try

       grd2xyz hawaii_grv.grd > hawaii_grv.xyz

       To  write a single precision binary file without the x,y positions from the file raw_data.grd file, using
       scanline orientation, try

       grd2xyz raw_data.grd -ZTLf > hawaii_grv.b

SEE ALSO

       gmtdefaults(1gmt), gmt(1gmt), grdedit(1gmt), xyz2grd(1gmt)

                                                   1 Jan 2004                                         GRD2XYZ(l)