NAME

       mDiffFitExec - Run mDiff and mFitplane for each record found by mOverlaps

SYNOPSIS

       mDiffFitExec [-d] [-l(evel-only)] [-n(o-areas)] [-p projdir] [-s statusfile]

            diffs.tbl region.hdr diffdir fits.tbl

DESCRIPTION

       Using the table of overlaps found by mOverlaps, mDiffFitExec runs both mDiff and mFitplane
       for each record.  The fitting parameters are written to a file to be used by mBgModel.

OPTIONS

       -d     Turns on debugging

       -l     Only find image background level differences, not slope offsets.

       -p     Directory containing projected images.

       -s statusfile
              Writes output message to statusfile instead of to stdout

ARGUMENTS

       diffs.tbl
              Overlap table generated by mOverlaps, listing all the image pairs that overlap.

       region.hdr
              FITS header template that was used to reproject the images.

       diffdir
              Working directory for the difference images.

       fits.tbl
              Output table of difference paramaters.

RESULT

       Generates a table, fits.tbl, containing all the information generated by running mDiff for
       the  image  pairs  in diffs.tbl and then mFitplane on each difference image.  count is the
       number of overlaps in diffs.tbl,  diff_failed  is  the  number  that  generated  an  error
       condition  for  mDiff,  fit_failed  is  the  number  that generated an error condition for
       mFitplane, and nwarning is the number that generated a warning.

MESSAGES

       ERROR  Cannot open status file: statusfile

       ERROR  Can't open output file.

       ERROR  Invalid diffs metadata file: diffsfile

       ERROR  Need columns: cntr1 cntr2 plus minus diff

       ERROR  svc library error

EXAMPLES

       First, diffs.tbl is generated for a collection of reprojected images using mOverlap:

       $ mDiffFitExec -d -p projected diffs.tbl gal.hdr diffs fits.tbl
              [struct stat="OK", count=6, diff_failed=0, fit_failed=0, warning=0]

       Output file: fits.tbl.

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.