bionic (1) grdclip.1gmt.gz

Provided by: gmt-common_5.4.3+dfsg-1_all bug

NAME
       grdclip - Clip the range of grids


SYNOPSIS
       grdclip  ingrid   -Goutgrid [  -Rregion ] [  -Sahigh/above ] [  -Sblow/below ] [  -Silow/high/between ] [
       -Srold/new ] [  -V[level] ]

       Note: No space is allowed between the option flag and the associated arguments.


DESCRIPTION
       grdclip will set values < low to below and/or values > high to above. You can also specify  one  or  more
       intervals  where  all values should be set to IT(between), or replace individual values.  Such operations
       are useful when you want all of a continent or an ocean to fall into one color or  gray  shade  in  image
       processing,  when  clipping  of  the  range  of  data values is required, or for reclassification of data
       values.  above, below, between, old and new can be any number or even NaN (Not a Number). You must choose
       at least one of the -S options. Use -R to only extract a subset of the ingrid file.


REQUIRED ARGUMENTS
       ingrid The input 2-D binary grid file.

       -Goutgrid
              outgrid is the modified output grid file.


OPTIONAL ARGUMENTS
       -Rxmin/xmax/ymin/ymax[+r][+uunit] (more …)
              Specify  the  region  of interest. Using the -R option will select a subsection of ingrid grid. If
              this subsection exceeds the boundaries of the grid, only the common region will be extracted.

       -Sahigh/above
              Set all data[i] > high to above.

       -Sblow/below
              Set all data[i] < low to below.

       -Silow/high/between
              Set all data[i] >= low and <= high to between.  Repeat the option for as  many  intervals  as  are
              needed.

       -Srold/new
              Set  all  data[i]  ==  old  to  new.  This is mostly useful when your data are known to be integer
              values.  Repeat the option for as many replacements as are needed.

       -V[level] (more …)
              Select verbosity level [c].

       -^ or just -
              Print a short message about the syntax of the command, then exits (NOTE: on Windows just use -).

       -+ or just +
              Print an extensive usage (help) message, including the explanation of any  module-specific  option
              (but not the GMT common options), then exits.

       -? or no arguments
              Print a complete usage (help) message, including the explanation of all options, then exits.


GRID FILE FORMATS
       By  default  GMT  writes  out  grid  as single precision floats in a COARDS-complaint netCDF file format.
       However, GMT is able to produce grid files in many  other  commonly  used  grid  file  formats  and  also
       facilitates so called “packing” of grids, writing out floating point data as 1- or 2-byte integers. (more
       …)


EXAMPLES
       To set all values > 70 to NaN and all values < 0 to 0 in file data.nc:

              gmt grdclip data.nc -Gnew_data.nc -Sa70/NaN -Sb0/0 -V

       To reclassify all values in the 25-30 range to 99, those in 35-39 to 55,  exchange  17  for  11  and  all
       values < 10 to 0 in file classes.nc, try

              gmt grdclip classes.nc -Gnew_classes.nc -Si25/30/99 -Si35/39/55 -Sr17/11 -Sb10/0 -V


SEE ALSO
       gmt, grdlandmask, grdmask, grdmath, grd2xyz, xyz2grd


       2018, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe