xenial (1) mProject.1.gz

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NAME

       mProject - Re-project FITS images

SYNOPSIS

       mProject  [-z  factor] [-d level] [-s statusfile] [-h hdu] [-x scale] [-w weightfile] [-t threshold] [-X]
       [-f] in.fits out.fits hdr.template

DESCRIPTION

       mProject reprojects a single image to the scale defined in a FITS header template file (read  more  about
       header  templates here). The program produces a pair of images: the reprojected image and an "area" image
       consisting of the fraction input pixel sky  area  that  went  into  each  output  pixel.   The  "drizzle"
       algorithm  is  implemented.   The algorithm proceeds by mapping pixel corners (as adjusted by drizzle, if
       called) from the input pixel space to the output pixel space, calculating overlap area with  each  output
       pixel,  and  accumulating  an  appropriate  fraction  of the input flux into the output image pixels.  In
       addition, the appropriate fraction of the input pixel area is accumulated into  the  area  image  pixels.
       Projection  of  points from input pixel space to output pixel space is calculated in two steps: first map
       from input pixel space to sky coordinates; second map from sky coordinates to output pixel space.

       One situation that has happened often enough to warrant special note:  It is possible to  define  a  FITS
       header  with  the  reference  location  off the image.  In particular, people often reference cylindrical
       projections (e.g., CAR, CEA) to location (0.,0.) (e.g., the Galactic  center).   This  is  not  wrong  in
       itself  but  does lead to extremely large pixel offsets (e.g., in the hundreds of thousands).  Related to
       this, if you extract a header from an image with large offsets of this type, it is unlikely that you  can
       simply  change  projection types without also adjusting the reference location/offsets.  Most likely, you
       will end up with the reproject data all being off-scale.

OPTIONS

       -z factor
              Processing is done utilizing the drizzle algorithm. factor is a floating point number; recommended
              drizzle factors are from 0.5 to 1.

       -d level
              Causes additional debugging information to be printed to stdout.  Valid levels are 1-5 (for higher
              debugging levels, it is recommended to redirect the output to a file).

       -s statusfile
              Output and errors are written to statusfile instead of being written to stdout.

       -h hdu Use the specified FITS extension (default is to use the first HDU with image data)

       -x scale
              Apply a correction factor of scale to each pixel

       -w weightfile
              Path to a weight map to be used when reading values from the input image.

       -t threshold
              Pixels with weights below threshold will be treated as blank.

       -X     Makes the output region (originally defined in the header template) big enough to include  all  of
              the input images

ARGUMENTS

       in.fits
              Input FITS file to be reprojected.

       out.fits
              Path of output FITS file to be created.

       hdr.template
              FITS header template to be used in generation of output image

RESULT

       Two   files  are  created  as  output:  the  reprojected  FITS  file  (out.fits),  and  an  "area"  image
       (out_area.fits) which records the amount of coverage (in  output  pixel  space)  provided  by  the  input
       images.

MESSAGES

       OK     [struct stat="OK", time=seconds]

       ERROR  Drizzle factor string (string) cannot be interpreted as a real number

       ERROR  Weight threshold string (string) cannot be interpreted as a real number

       ERROR  Flux scale string (string) cannot be interpreted as a real number

       ERROR  Cannot open status file: statusfile

       ERROR  HDU value (hdu) must be a non-negative integer

       ERROR  No overlap

       ERROR  Not enough memory for output data image array

       ERROR  Not enough memory for output area image array

       ERROR  Output wcsinit() failed.

       ERROR  Input wcsinit() failed.

       ERROR  FITS library error

       ERROR  All pixels are blank

       ERROR  Template file not found

       ERROR  Image file in.fits missing or invalid FITS

       ERROR  Weight file weightfile missing or invalid FITS

EXAMPLES

       $ mProject rawdir/real_orig.fits projdir/base_unity.fits templates/galactic_orig.txt
              [struct stat="OK", time=143]

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.

       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.