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=pod
=head1 NAME
B<funmerge - merge one or more Funtools table files>
=head1 SYNOPSIS
funmerge [-w|-x] -f [colname] <iname1> <iname2> ... <oname>
=head1 OPTIONS
-f # output a column specifying file from which this event came
-w # adjust position values using WCS info
-x # adjust position values using WCS info and save old values
=head1 DESCRIPTION
B<funmerge> merges FITS data from one or more
FITS Binary Table files
or raw event files.
The first argument to the program specifies the first input FITS table
or raw event file. If "stdin" is specified, data are read from the
standard input. Use Funtools Bracket
Notation to specify FITS extensions and row filters. Subsequent
arguments specify additional event files and tables to merge. (NB: Stdin
cannot not be used for any of these additional input file arguments.)
The last argument is the output FITS file. The columns in each input table
must be identical.
If an input file begins with the '@' character, it is processed as an
include file, i.e., as a text file containing event file names (as
well as blank lines and/or comment lines starting with the '#' sign).
If standard input is specified as an include file ('@stdin'), then
file names are read from the standard input until EOF (^D). Event
files and include files can be mixed on a command line.
Rows from each table are written sequentially to the output
file. If the switch B<-f [colname]> is specified on the command
line, an additional column is added to each row containing the number
of the file from which that row was taken (starting from one). In
this case, the corresponding file names are stored in the header
parameters having the prefix B<FUNFIL>, i.e., FUNFIL01,
FUNFIL02, etc.
Using the B<-w> switch (or B<-x> switch as described
below), B<funmerge> also can adjust the position column values
using the WCS information in each file. (By position columns, we mean
the columns that the table is binned on, i.e., those columns defined
by the B<bincols=> switch, or (X,Y) by default.) To perform WCS
alignment, the WCS of the first file is taken as the base WCS. Each
position in subsequent files is adjusted by first converting it to the
sky coordinate in its own WCS coordinate system, then by converting
this sky position to the sky position of the base WCS, and finally
converting back to a pixel position in the base system. Note that in
order to perform WCS alignment, the appropriate WCS and TLMIN/TLMAX
keywords must already exist in each FITS file.
When performing WCS alignment, you can save the original positions in
the output file by using the B<-x> (for "xtra") switch instead
of the B<-w> switch (i.e., using this switch also implies using
B<-w>) The old positions are saved in columns having the same
name as the original positional columns, with the added prefix "OLD_".
Examples:
Merge two tables, and preserve the originating file number for
each row in the column called "FILE" (along with the corresponding
file name in the header):
[sh] funmerge -f "FILE" test.ev test2.ev merge.ev
Merge two tables with WCS alignment, saving the old position values in
2 additional columns:
[sh] funmerge -x test.ev test2.ev merge.ev
This program only works on raw event files and binary tables. We have
not yet implemented image and array merging.
=head1 SEE ALSO
See funtools(n) for a list of Funtools help pages
=cut
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