Provided by: stilts_3.1.5-1_all bug

NAME

       stilts-pixfoot - Generates Multi-Order Coverage maps

SYNOPSIS

       stilts pixfoot [ifmt=<in-format>] [istream=true|false] [in=<table>] [icmd=<cmds>]
                      [order=<int-value>] [ra=<expr>] [dec=<expr>] [radius=<expr>]
                      [mocfmt=fits|json] [out=<out-file>]

DESCRIPTION

       pixfoot  takes  a  list  of  sky  positions  from an input table and generates a pixel map
       describing a sky region which includes them all. Currently the output is to a format known
       as a Multi-Order Coverage map (MOC), which is a HEALPix-based format composed of a list of
       HEALPix pixels of different sizes, which can efficiently describe complex  regions.  Other
       output formats may be introduced in the future.

       See also the Coverage class for MOC-related functions.

OPTIONS

       ifmt=<in-format>
              Specifies  the  format  of  the input table as specified by parameter in. The known
              formats are listed in SUN/256. This flag can be used if you know what  format  your
              table is in. If it has the special value (auto) (the default), then an attempt will
              be made to detect the format of the table automatically. This cannot always be done
              correctly  however,  in  which  case the program will exit with an error explaining
              which formats were attempted.

       istream=true|false
              If set true, the input table specified by the  in  parameter  will  be  read  as  a
              stream.  It  is necessary to give the ifmt parameter in this case. Depending on the
              required operations and processing mode, this may cause the read to fail (sometimes
              it  is necessary to read the table more than once). It is not normally necessary to
              set this flag; in most cases the data will be streamed automatically if that is the
              best  thing  to  do.  However  it  can sometimes result in less resource usage when
              processing large files in certain formats (such as VOTable).

       in=<table>
              The location of the input table. This may take one of the following forms:

                * A filename.

                * A URL.

                * The special value "-", meaning standard input. In this case  the  input  format
                  must  be  given  explicitly using the ifmt parameter. Note that not all formats
                  can be streamed in this way.

                * A system command line with either a "<"  character  at  the  start,  or  a  "|"
                  character at the end ("<syscmd" or "syscmd|"). This executes the given pipeline
                  and reads from its standard output. This will probably only work  on  unix-like
                  systems.
               In  any  case,  compressed data in one of the supported compression formats (gzip,
              Unix compress or bzip2) will be decompressed transparently.

       icmd=<cmds>
              Specifies processing to be performed on the input table as specified  by  parameter
              in, before any other processing has taken place. The value of this parameter is one
              or more of the filter commands described in SUN/256. If more  than  one  is  given,
              they  must  be  separated  by  semicolon  characters  (";").  This parameter can be
              repeated multiple times on the same command line to build up a list  of  processing
              steps.  The  sequence of commands given in this way defines the processing pipeline
              which is performed on the table.

              Commands may alteratively be supplied in an external file, by using the indirection
              character  '@'. Thus a value of "@filename" causes the file filename to be read for
              a list of filter commands to execute. The commands in the file may be separated  by
              newline characters and/or semicolons, and lines which are blank or which start with
              a '#' character are ignored.

       order=<int-value>
              Maximum HEALPix order for the MOC. This  defines  the  maximum  resolution  of  the
              output   coverage   map.  The  angular  resolution  corresponding  to  order  k  is
              approximately 180/sqrt(3.Pi)/2^k (3520*2^-k arcmin).

       ra=<expr>
              Right ascension in degrees for the position of each row of the  input  table.  This
              may  simply  be a column name, or it may be an algebraic expression calculated from
              columns as explained in SUN/256. If left blank, an attempt is made  to  guess  from
              UCDs, column names and unit annotations what expression to use.

       dec=<expr>
              Declination  in  degrees  for the position of each row of the input table. This may
              simply be a column name, or it may  be  an  algebraic  expression  calculated  from
              columns  as  explained  in SUN/256. If left blank, an attempt is made to guess from
              UCDs, column names and unit annotations what expression to use.

       radius=<expr>
              Expression which evaluates to the radius in degrees of the cone at each row of  the
              input  table. The default is "0", which treats each position as a point rather than
              a cone, but a constant or an  expression  as  described  in  SUN/256  may  be  used
              instead.

       mocfmt=fits|json
              Determines the output format for the MOC file.

       out=<out-file>
              The  location  of the output file. This is usually a filename to write to. If it is
              equal to the special value "-" the output will be written to standard output.

SEE ALSO

       stilts(1)

       If the package stilts-doc is installed, the full documentation  SUN/256  is  available  in
       HTML format:
       file:///usr/share/doc/stilts-doc/sun256/index.html

VERSION

       STILTS version 3.1-5-debian

       This  is  the  Debian  version  of Stilts, which lack the support of some file formats and
       network protocols. For differences see
       file:///usr/share/doc/stilts/README.Debian

AUTHOR

       Mark Taylor (Bristol University)

                                             Mar 2017                           STILTS-PIXFOOT(1)