next up previous contents index
Next: MAP_SMOOTH /ASYMMETRIC Up: CLEAN Language Internal Help Previous: MAP_RESAMPLE /LIKE   Contents   Index


MAP_SMOOTH

        [CLEAN\]MAP_SMOOTH WhichOne Nc [Result] [/ASYMMETRIC]

    Smooth a  3-D data cubes by Nc channels along the velocity axis.
         Nc   number of channels to be averaged in smoothing.
    WhichOne indicates which data cube must be  compressed.  Allowed  values
    are
         - Built-in buffers DIRTY, CLEAN, SKY, SINGLE or *, which means all
           of the previous existing ones. Smoothing is done in place.
         - Any SIC Image Variable that is not a built-in buffer in IMAGER.
         - A GILDAS data file
    For  the  two  later  cases,  the  Result  argument  indicates where the
    smoothed data cube is stored. Result can be a file name or  an  existing
    SIC variable of adequate dimensions.

    By  default,  the smoothing does not modify the spectral sampling of the
    cubes. While this naturally occurs when the smoothing number Nc is  odd,
    the  Nc  even  case  requires  a  specific  handling.   For Nc even, the
    smoothed channel at channel "i" sums up half of channel i-Nc/2, half  of
    channels  i+Nc/2  and all channels in between.  Thus for Nc=2, this is a
    Hanning smoothing.

    Like for UV_SMOOTH, this behaviour can be modified by  option  /ASYMMET-
    RIC.


Subsections

Gildas manager 2023-06-01