astwarp1

Usage

Overview

Warp is part of GNU Astronomy Utilities 0.23. 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.

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.

--outfitsnocommit

No Git commit in 0-th HDU of output FITS.

--outfitsnoconfig

No metadata in 0-th HDU of output FITS.

--outfitsnodate

No 'DATE' in 0-th HDU of output FITS.

--outfitsnoversions

No versions in 0-th HDU of output FITS.

-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.

--config-prefix=STR

Custom prefix of option names config files.

--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/