Provided by: ncl-ncarg_6.5.0-2_amd64 bug

NAME

       Rascat - concatenate, convert raster files

SYNOPSIS

       rascat  [  -help ] [ -ifmt format ] [ -ira algorithm ] [ -ofmt format ] [ -output file ] [
       -resolution resolution ] [ -rgbscale scale-factor ] [ -scale scale-factor ] [ -verbose ] [
       -Version ] [ -window nx ny x y ] [ -pal palette_file ] [ -|file...  ]

DESCRIPTION

       rascat  reads  each  file  in  sequence  and  copies  its  contents to the standard output
       performing any format conversion and data massaging necessary as specified by the  command
       line  options.   By default, rascat determines the format of a file by looking at the file
       name extension.  If there are multiple files input into rascat with varying  file  formats
       rascat will perform format conversion such that the resulting concatenated file will be in
       the format of the first file processed.

       Input files must all have the same spatial resolution and have the same depth;  8-bit  and
       24-bit files may not be intermixed. Furthermore, if an input file contains multiple images
       each image in that file must have the same spatial resolution and be of the same depth.

       Currently, only 8-bit-indexed and 24-bit-direct color encodings are supported.

       See ras_formats(5NCARG) for a list of supported image formats.

OPTIONS

       -help  Print a usage message and exit.

       -ifmt format
              Specify the input file format.  format is one of the file name extensions discussed
              in ras_formats(5NCARG) (without the ".", e.g.  xwd).  When this option is specified
              file name extensions are not necessary and are ignored if present.  All input files
              must have the same format.

       -ira algorithm
              Specify  the  image  resampling  algorithm to be used when either the -scale or the
              -resolution command line option is used.  algorithm may be either NN, indicating  a
              "nearest   neighbor"   algorithm,  or  BL,  indicating  a  "bilinear  interplation"
              algorithm. The default is to do "nearest neighbor" interpolation.

       -ofmt format
              Specify the output file format.  format is one  of  the  aforementioned  file  name
              extensions.  If  used  in  conjunction with the -output option the output file name
              requires no name extension and is ignored if present.

       -output file
              Specify an ouput file name and possibly  an  implicit  output  format.  By  default
              rascat writes to the standard output. When this option is used output is written to
              file.  If the -ofmt option is not specified file must have a  file  name  extension
              recognized  by  rascat.   In  which case the file name extension will determine the
              output format.

       -resolution resolution
              Resample the spatial resolution of input imagery to resolution, where resolution is
              the  number  of pixels in the x direction, followed by an x, followed by the number
              of pixels in the y direction, with no intervening  spaces.  For  example,  512x512,
              specifies a 512 by 512 pixel resolution.

              Warning:  Aspect ratios are not preserved by this option. If the resolution of your
              input imagery has a different aspect ratio then that specified  by  resolution  the
              resultant image will be distorted.

       -rgbscale scale-factor
              Specify  a  floating  point  scaling factor, scale-factor, to be applied to all the
              color intensities contained  in  the  input  files.   This  option  may  be  fairly
              computationally expensive with 24-bit-direct encoded imagery.

       -scale scale-factor
              Specify  a  uniform,  floating-point  scaling  factor  to be applied to the spatial
              resolution of the input files. Unlike the -resolution option this option guarantees
              to  preserve the aspect ratio of your imagery. For example, setting scale-factor to
              0.5 causes your imagery to be resampled to  one  fourth  of  its  original  spatial
              resolution. If its original resolution was 1024x1024 the resultant resolution would
              be 512x512.

       -verbose
              Tells rascat to operate in verbose mode.

       -Version
              Print rascat's version number and then exit.

       -window nx ny x y
              Specify a subregion of the input imagery to be  extracted.  The  area  outside  the
              rectangular subregion defined by nx, ny, x and y is discarded.  x and y specify the
              position of the upper-left  corner  of  the  rectangle.   nx  and  ny  specify  the
              rectangle's width and height, respectively.

       -pal palette_file
              Set  the palette for the output rasterfile from palettefile, which can be either an
              HDF-type palette with an  extension  of  ".pal",  or  a  textual  palette  with  an
              extension of ".txt". See ras_palette(5NCARG) for documentation on the formats. This
              option applies to indexed-color imagery only.

ENVIRONMENT

       NCARG_TMP
              If set, this environment  variable  contains  a  directory  path  to  be  used  for
              temporary  files. On most systems the default is /tmp.  On some systems the default
              is /usr/tmp.

EXAMPLES

       In the following example a NRIF file, a  Sun  raster  image  file,  and  a  XWD  file  are
       concatenated and converted into a single NRIF file:

              % rascat file1.nrif file2.sun file3.xwd > file123.nrif

       In this example the same files are converted and concatenated into a sun file:

              % rascat -ofmt sun file1.nrif file2.sun file3.xwd > file123.sun

       The  -ofmt option is necessary in this example because the first file rascat encounters is
       an NRIF file.

       Finally, in this example the upper left 512 by  512  rectangle  of  the  file  foo.sun  is
       extracted and written to the file foo.512x512.sun:

              % rascat -window 512 512 0 0 foo.sun > foo.512x512.sun

SEE ALSO

       rasgetpal(1NCARG),  rasls(1NCARG), rassplit(1NCARG), rasview(1NCARG), ras_formats(5NCARG),
       ras_palette(5NCARG)

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

CAVEATS

       Aspect ratios are not preserved by the -resolution option.

       Not all formats support both 8-bit and 24-bit encodings.

       Indexed and direct color encodings cannot be mixed.

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.