GRID

 

        ANALYSE\GRID [Filename] [NEW|APPEND] [MATH_EXPRESSION]
        [/CHANNEL [C|V|F|I] min max]
        [/IMAGE [BEAM beam] [LAM nx rx vx ix]  [BETA  ny  ry  vy  iy]  [LIKE
    tempfile]]
        [/PLOT [where]] [/SMOOTH fx fy]

    This command builds a GILDAS table containing the following values
       Column 1   X offset (in radians)
       Column 2   Y Offset (in radians)
       Column 3   Weight of the data
       and
        Columns 4 to... : values of the specified Spectral channel(s)
       or
        Column 4: Result of the mathematical expression
    from the current index of scans. IT IS UP TO THE USER to ENSURE that the
    current  index concerns a SINGLE SOURCE and a SINGLE LINE, observed with
    a UNIQUE SPECTRAL RESOLUTION, with ALL  spectra  centered  at  the  SAME
    VELOCITY.   Option  /IMAGE  is used to grid the data into a (2-d or) 3-d
    cube, option /PLOT to plot a map of channel-averaged data.

    If "Filename" is not present the data is appended to the  current  table
    (the  one  opened by the last GRID command). If "APPEND" is given as the
    second argument the table Filename is opened and data is appended to it;
    otherwise  "NEW"  may  be  specified  to  open  a new table; this is the
    default.

    If "MATH_EXPRESSION" is present in  the  command  line,  Column  4  will
    contain  the result of Math_expression applied for each spectrum.   This
    is particulary handy when one use the SIC variables and  functions  (see
    HELP   CUBE  Functions,  HELP  LAS\SET  VARIABLE  and  try  the  command
    SIC\EXAMINE /FUNCTION) in the Math_expression.

    Option /CHANNEL can be used to limit the part of the spectra  that  will
    be included in the table (not used if you treat a Math_expression).

    The resulting table can then be processed as a whole  using  the  GILDAS
    (Grenoble  Image and Line Data Analysis System) software.  With /IMAGE a
    data cube is created from this table. GILDAS includes tasks  to  do  the
    same job with more flexibility (GRID_SG and GRID_EXTEND), and transpose,
    reinterpolate, change the projection systems,  make  overlays  with  the
    IRAS  point sources, contours and so on from data cubes. Call GRAPHIC at
    system level and then type EXPLAIN for more information on GILDAS tasks.

• GRID /CHANNEL
• GRID /IMAGE
• GRID /PLOT
• GRID /SMOOTH