Provided by: montage_6.0+dfsg-6_amd64 bug

NAME

       mExamine - Information about the sky coverage of a FITS image

SYNOPSIS

       mExamine [-d][-p ra dec radius] image.fits

DESCRIPTION

       mExamine returns information about the sky coverage of a FITS image (assuming WCS keywords
       in the header) and optionally pixel statistics for a region in the image.

OPTIONS

       -p ra dec radius

              Return information about a  region  (central  pixel  value,  min,  max  values  and
              location,  etc.)   Coordinates and radius are in degrees unless given a "p" suffix,
              in which case they are in pixels.

       -a ra dec

              Returns a simple aperture photometry fit to a location.  Cannot be used at the same
              time as the -p option above.  Also supports the "p" suffix rule from above.

       -d

              Turn on debugging.

ARGUMENTS

       image.fits

              FITS  file  to examine. If the file has multiple HDUs, you can add that to the file
              name, e.g., "m51.fits[2]".  If an HDU  is  a  datacube,  you  can  select  a  plane
              ("m51.fits[2][256]").  Even if there is a single HDU, you need to specify it if you
              want to specify a cube plane  ("m51.fits[0][512]").   Note  that  this  syntax  may
              require quotes around the file name string to avoid confusing your shell.

RESULT

       If successful, returns the following:

       projImage projection csysCoordinate system equinoxCoordinate system equinox naxisNumber of
       axes in the file naxis1Image width (in pixels) naxis2Image height  naxis3Data  cube  depth
       (only  if  NAXIS  >  2)  naxis4Data  cube  fourth  dimension (only if NAXIS > 3) crval1WCS
       reference coordinate for  first  axis  crval2WCS  reference  coordinate  for  second  axis
       crpix1Pixel  value  for  reference  coordinate  crpix2  cdelt1Pixel scale (degrees) cdelt2
       crota2Rotation of image (E of N) loncSky coordinate of  image  center  latc  ximgsizeImage
       size  (degrees)  yimgsize  rotequRotation  of  image  in  Equatorial (J2000) racEquatorial
       (J2000) coordinates of image center decc ra1Equatorial coordinates of four  image  corners
       dec1 ra2 dec2 ra3 dec3 ra4 dec4

       and optionally

       radiusRadius  of  pixel  region (degrees) radpixRadius in pixels npixelNumber of pixels in
       region nnullNumber of null pixels avefluxAverage flux  for  region  rmsfluxRMS  of  region
       fluxes  fluxrefFlux  for reference location sigmarefRMS of fluxes xrefPixel coordinates of
       reference location yref rarefEquatorial (J2000) coordinated of reference  location  decref
       fluxminSame  for  pixel  with minimum flux sigmamin xmin ymin ramin decmin fluxmaxSame for
       pixel with maximum flux sigmamax xmax ymax ramax decmax

       If you specify region that is all blank, npixel will be zero,  nnull  will  be  the  total
       number of pixel examined, and the flux related parameters will all be zero.

MESSAGES

       ERROR  No ra, dec, radius location given or file name missing

       ERROR  File name missing

       ERROR  Cannot open FITS file test.fits

       ERROR  Cannot find WCS keys in FITS file test.fits

       ERROR  WCS initialization failed.

       ERROR  Location off the image.

       ERROR  Error reading FITS data.

EXAMPLES

       mExamine -p 202.5 47.0 0.01 aJ_asky_980527n0240232.fits

              [struct    stat="OK",    proj="SIN",   csys="EQUJ",   equinox=2000.0,   naxis1=512,
              naxis2=1024,  crval1=202.5213942,  crval2=47.1131924,  crpix1=256.5,  crpix2=512.5,
              cdelt1=0.0002778,      cdelt2=0.0002778,      crota2=0.0034,      lonc=202.5213942,
              latc=47.1134702,     ximgsize=0.142222,      yimgsize=0.142222,      rotequ=0.0034,
              rac=202.5213942,       decc=47.1131924,      ra1=202.6260252,      dec1=46.9706487,
              ra2=202.4171950,      dec2=46.9706407,      ra3=202.4166112,       dec3=47.2553630,
              ra4=202.6265617,   dec4=47.2553710,  radius=0.0100000,  radpix=36.00,  npixel=5476,
              nnull=0,  aveflux=136.807,  rmsflux=0.853615,   fluxref=137.3,   sigmaref=0.578143,
              xref=309,    yref=105,   raref=202.5000208,   decref=46.9999951,   fluxmin=135.042,
              sigmamin=-2.06764,   xmin=328,   ymin=77,   ramin=202.4922870,   decmin=46.9922153,
              fluxmax=152.299,    sigmamax=18.1493,    xmax=307,   ymax=117,   ramax=202.5008338,
              decmax=47.0033286]

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.