NAME

       mHdrWWT - None

SYNOPSIS

       mHdrWWT tileID hdrFile

DESCRIPTION

       Creates the header template for a specific WWT/TOAST tile.  These tiles are not usually of
       any use except in serving the WWT interface, though the files are standard FITS and PNG so
       can  be  viewed  that way if so desired.  Tiles are identified by WWT tile ID (a Z-ordered
       quandrant digits string).

ARGUMENTS

       tileID For the top-level (all-sky) TOAST tile, the tileID is an  empty  string.   For  the
              next  level  down the sky is divided in four "quadrants" with the tileID being "0",
              "1", "2" and "3".  This proceeds to finer granularity,  with  tiles  at  the  fifth
              level down having IDs like "3102".

       hdrFile
              Output  header  file,  normally  having  a  name  that  includes  the tileID (e.g.,
              "planck.hdr", "planck3102.hdr").

RESULT

       Generates the specified header file, which will then be used by  mProjectQL  to  reproject
       input  data  into TOAST tile FITS files (which in turn are converted by mViewer into TOAST
       tile PNG files).  Normally, all this is only used in conjunction with the WWT interface.

MESSAGES

       OK     [struct stat="OK", level=level, xtile=i, ytile=j]

       ERROR  Invalid character in ID string (must be in [0,1,2,3])

       ERROR  Cannot open output header file.

EXAMPLES

       Tile IDs are in the form of  a  Z-ordered  recursion.   For  informational  purposes,  the
       program  also  outputs the location of the tile in the  "x" and "y" location it has in the
       array of tiles for its tile level.

       $ mHdrWWT "3102" planck3102.hdr
              [struct stat="OK", level=4, xtile=12, ytile=6]

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.