MROTATE

NAME

mRotate - Rotate a FITS image by an arbitrary angle

SYNOPSIS

mRotate [-d level] [-s statusfile] [-r rotang] in.fits out.fits [ra dec xsize [ysize]]

DESCRIPTION

Rotates a FITS image by an arbitrary angle. This module is meant for quick-look only; it is not flux conserving.

OPTIONS

-d level

Print out additional debugging information (level can be 1-3)

-s statusfile

Output and errors are written to statusfile instead of stdout.

-r rotang

Provide an angle (in degrees) to rotate the image.

ARGUMENTS

in.fits

Input FITS image.

out.fits

Path to output (rotated) FITS image.

ra dec xsize

Center location and width (in degrees) of output image - optional. By default, entire input image area will be included in output image.

ysize

Height (in degrees) of output image, if a new center location and width are provided. Optional - defaults to xsize.

RESULT

[struct stat="OK"]

Output file will contain the same image as the input file, but rotated by rotang degrees. If a new center location and width were provided, the output image will be the "subimage" covering that area.

MESSAGES

	OK		[struct stat="OK"]
	ERROR		No status file name given
	ERROR		Cannot open status file: statusfile
	ERROR		No rotation angle given
	ERROR		Rotation angle string is invalid: ’rotang’
	ERROR		No debug level given
	ERROR		Debug level string is invalid: ’level’
	ERROR		Debug level value cannot be negative
	ERROR		Invalid input file ’in.fits’
	ERROR		Invalid output file ’out.fits’
	ERROR		Center RA string (ra) cannot be interpreted as a real number
	ERROR		Center Dec string (dec) cannot be interpreted as a real number
	ERROR		X size string (xsize) cannot be interpreted as a real number
	ERROR		Y size string (ysize) cannot be interpreted as a real number
	ERROR		Invalid ’x’ size
	ERROR		Invalid ’y’ size
	ERROR		Location is off image
	ERROR		No pixels match output area
	ERROR		No pixels match input area
	ERROR		wcsinit() failed
	ERROR		Image file in.fits missing or invalid FITS
	ERROR		FITS library error

EXAMPLES

$ mRotate -r 90 in.fits out.fits

[struct stat="OK"]

BUGS

The drizzle algorithm has been implemented but has not been tested in this release.

If a header template contains carriage returns (i.e., created/modified on a Windows machine), the cfitsio library will be unable to read it properly, resulting in the error: [struct stat="ERROR", status=207, msg="illegal character in keyword"]

It is best for the background correction algorithms if the area described in the header template completely encloses all of the input images in their entirety. If parts of input images are "chopped off" by the header template, the background correction will be affected. We recommend you use an expanded header for the reprojection and background modeling steps, returning to the originally desired header size for the final coaddition. The default background matching assumes that there are no non-linear background variations in the individual images (and therefore in the overlap differences). If there is any uncertainty in this regard, it is safer to turn on the "level only" background matching (the "-l" flag in mBgModel.

COPYRIGHT

2001-2015 California Institute of Technology, Pasadena, California

If your research uses Montage, please include the following acknowledgement: "This research made use of Montage. It is funded by the National Science Foundation under Grant Number ACI-1440620, and was previously funded by the National Aeronautics and Space Administration’s Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology."

The Montage distribution includes an adaptation of the MOPEX algorithm developed at the Spitzer Science Center.