NAME

       Warp - warp (transform) input dataset

SYNOPSIS

       astwarp [OPTION...] ASTRdata

DESCRIPTION

       Warp  is  part  of  GNU Astronomy Utilities 0.19.  Warp will resample the pixel grid of an
       input image. By default (if no special linear warping is requested),  it  will  align  the
       image  to  the  WCS  coordinates  in anyand remove any possible distortion. Linear warping
       (like '--rotate' or '--scale') should be explicitly requested with the options  under  the
       "Linear warps" group below.

       For  more  information, please run any of the following commands. In particular the second
       contains a  very  comprehensive  explanation  of  Warp's  invocation:  expected  input(s),
       output(s), and a full description of all the options.

       All options and their values:
              $ astwarp -P

       Inputs/Outputs and options:
              $ info astwarp

       Full section in manual/book:
              $ info Warp

       Full Gnuastro manual/book:
              $ info gnuastro

       If  you  couldn't find your answer in the manual, you can get direct help from experienced
       Gnuastro users and developers. For more information, please run:

              $ info help-gnuastro

       Warp options:

              Input:

       --hendwcs=INT
              Header keyword number to end reading WCS.

       --hstartwcs=INT
              Header keyword number to start reading WCS.

       -h, --hdu=STR/INT
              Extension name or number of input data.

              Output:

       -C, --coveredfrac=FLT
              Acceptable fraction of output pixel covered.

       -D, --dontdelete
              Don't delete output if it exists.

       -k, --keepwcs
              Do not apply warp to input's WCS

       -K, --keepinputdir
              Keep input directory for automatic output.

       -o, --output=STR
              Output file name.

       -T, --type=STR
              Type of output: e.g., int16, float32, etc...

       --wcslinearmatrix=STR
              WCS linear matrix of output ('pc' or 'cd').

              Align with WCS coordinates (correcting distortion, default mode)

       --checkmaxfrac
              Moire pattern: Max.frac. input pixels on output.

       --ctype=STR[,STR]
              FITS standard CTYPE value (e.g., 'RA---TAN').

       -c, --center=FLT,FLT
              Center coordinate of the output image in RA,DEC.

       --edgesampling=INT
              Number of extra samplings in pixel sides.

       -G, --gridfile=FITS
              File to use for output grid.

       -H, --gridhdu=STR
              HDU/extension to use for output grid.

       --widthinpix           --width is in pixels, not in WCS coordinates.

       -w, --width=INT,INT
              Output image size in both dimensions.

       -x, --cdelt=FLT[,FLT]
              Pixel scale of output (usually degrees/pixel).

              Linear warps (must be called explicitly on command-line)

       --centeroncorner
              Center of coordinates on first pixel corner.

       -e, --shear=FLT[,FLT]
              Shear along the given axis(es).

       -f, --flip=INT[,INT]
              Flip along the given axis(es).

       -m, --matrix=STR
              Raw transformation matrix, highest priority.

       -p, --project=FLT[,FLT]
              Project along the given axis(es).

       -r, --rotate=FLT
              Rotate by the given angle in degrees.

       -s, --scale=FLT[,FLT]
              Scale along the given axis(es).

       -t, --translate=FLT[,FLT]
              Translate along the given axis(es).

              Operating modes:

       -?, --help
              give this help list

       --checkconfig
              List all config files and variables read.

       --cite BibTeX citation for this program.

       --config=STR
              Read configuration file STR immediately.

       --lastconfig
              Do not parse any more configuration files.

       --log  Information about output(s) in a log file.

       --minmapsize=INT
              Min. bytes to avoid RAM automatically.

       -N, --numthreads=INT
              Number of CPU threads to use.

       --onlyversion=STR
              Only run if the program version is STR.

       -P, --printparams
              Print parameter values to be used and abort.

       --quietmmap
              Don't print mmap'd file's name and size.

       -q, --quiet
              Only report errors, remain quiet about steps.

       -S, --setdirconf
              Set default values for this directory and abort.

       --usage
              give a short usage message

       -U, --setusrconf
              Set default values for this user and abort.

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory  or  optional  for  any
       corresponding short options.

       GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

REPORTING BUGS

       Report bugs to bug-gnuastro@gnu.org.

COPYRIGHT

       Copyright  ©  2015-2022 Free Software Foundation, Inc.  License GPLv3+: GNU General public
       license version 3 or later.
       This is free software: you are free to change and redistribute it.  There is NO  WARRANTY,
       to the extent permitted by law.

       Written/developed by Mohammad Akhlaghi and Pedram Ashofteh-Ardakani

SEE ALSO

       The  full  documentation for Warp is maintained as a Texinfo manual.  If the info and Warp
       programs are properly installed at your site, the command

              info Warp

       should give you access to the complete manual.