grdreformat(1) [debian man page]

GRDREFORMAT(l)															    GRDREFORMAT(l)

NAME

       grdreformat - Converting between different grdfile formats.

SYNOPSIS

       grdreformat ingrdfile[=id[/scale/offset[/NaNvalue]]] outgrdfile[=id[/scale/offset[/NaNvalue]]] [ -Rwest/east/south/north[r] ] [ -V ]

DESCRIPTION

       grdreformat  reads a grdfile in one format and writes it out using another format. As an option the user may select a subset of the data to
       be written and to specify scaling, translation, and NaN-value.

       ingrdfile
	      The grdfile to be read. Append format =id number if not a standard GMT netcdf-based grdfile.  If	id  is	set,  you  may	optionally
	      append  scale and offset to scale the data and then add an offset. If scale and offset are supplied you may also append a value that
	      represent 'not-a-number' (for floating-point grids this is unneccesary since the IEEE NaN is used; however  short  integers  need  a
	      value which means no data available.)

       outgrdfile
	      The  grdfile  to	be written. Append format =id number if not a standard GMT netcdf-based grdfile.  If id is set, you may optionally
	      append scale and offset to scale the data and then add an offset. If scale and offset are supplied you may also append a value  that
	      represent  'not-a-number'  (for  floating-point  grids this is unneccesary since the IEEE NaN is used; however short integers need a
	      value which means no data available.)  For format =id > 0 the size of the GMT grdheader block is hsize = 896 bytes,  and	the  total
	      size  of	the  file  is  hsize  + nx * ny * item_size, where item_size is the size in bytes of each element (1, 2, 4). Bit grids are
	      stored using 4-byte integers, each holding 32 bits, so for these files the size equation is modified by using ceil (nx  /  32)  *  4
	      instead of nx. For header and grid details, see Appendix B.

OPTIONS

       -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.

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

EXAMPLES

       To create a 4-byte raw floating point grid from the netcdf file data.grd, try

       grdreformat data.grd ras_data.b4=1 -V

       To make a 2-byte short integer file, scale it by 10, subtract 32000, setting NaNs to -9999, do

       grdreformat values.grd shorts.i2=2/10/-32000/-9999 -V

       To create a Sun standard 8-bit rasterfile for a subset of the data file image.grd, assuming the range in  image.grd  is	0-1  and  we  need
       0-255, try

       grdreformat image.grd -R-60/-40/-40/-30 image.ras8=3/255/0 -V

SEE ALSO

       gmt(1gmt), grdmath(1gmt)

								    1 Jan 2004							    GRDREFORMAT(l)

Check Out this Related Man Page

GRDEDIT(l)																GRDEDIT(l)

NAME

       grdedit - Modifying the header in a 2-D grdfile

SYNOPSIS

       grdedit grdfile [ -A ] [ -Dxunit/yunit/zunit/scale/offset/title/remark ] [ -Rwest/east/south/north[r] ] [ -S ] [ -V ]

DESCRIPTION

       grdedit	reads  the  header  information  in a binary 2-D grdfile and replaces the information with values provided on the command line [if
       any]. As an option, global, geographical grids (with 360 degrees longitude range) can be rotated in the east-west direction.  grdedit  only
       operates on files containing a grdheader.
	       No space between the option flag and the associated arguments. Use upper case for the option flags and lower case for modifiers.

       grdfile
	      Name of the 2-D grdfile to modify

OPTIONS

       -A     If necessary, adjust the file's x_inc, y_inc to be compatible with its domain (or a new domain set with -R).  Older gridfiles (i.e.,
	      created prior to GMT 3.1) often had excessive slop in' x_inc, y_inc and an adjustment is necessary. Newer  files	are  created  cor-
	      rectly.

       -D     Give  new values for xunit, yunit, zunit, scale, offset, title, and remark.  To leave some of the values untouched, specify = as the
	      new value.

       -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.  The new w/e/s/n values will
	      replace those in the grid, and the x_inc, y_inc values are adjusted, if necessary.

       -S     For global, geographical grids only. Grid values will be shifted laterally according to the new borders given in -R.

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

EXAMPLES

       Let us assume the file data.grd covers the area 300/310/10/30. We want to change the boundaries from geodetic longitudes to geographic  and
       put a new title in the header. We accomplish this by

       grdedit data.grd -R-60/-50/10/30 -D=/=/=/=/=/"Gravity Anomalies"/=

       The grid world.grd has the limits 0/360/-72/72. To shift the data so that the limits would be -180/180/-72/72, use

       grdedit world.grd -R-180/180/-72/72 -S

       The file junk.grd was created prior to GMT 3.1 with incompatible -R and -I arguments. To reset the x- and y-increments we run

       grdedit junk.grd -A

SEE ALSO

       gmt(1gmt), grd2xyz(1gmt), xyz2grd(1gmt)

								    1 Jan 2004								GRDEDIT(l)

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grdreformat(1) [debian man page]

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