1 IMAGE_SAMPLING Define a sampling grid for use as input to SHORT_MODEL
        IMAGE_SAMPLING

    Define  a  sampling  grid  for use as input to SHORT_MODEL. The sampling
    grid is a regular rectangular grid large enough to cover the size of the
    input  sky image. It is better than Nyquist sampled, i.e. the pixel size
    is the beam width divided by POINT_PER_BEAM$. One grid point either pass
    through the sky image center or the reference pixel available in the sky
    image.

    To better mimic On-The-Fly observations the  grid  should  have  Nyquist
    sampling perpendicular to the scanning direction.

    The  grid  nod  positions are given in radian as offsets compared to the
    reference position of the sky image. The grid is duplicated by the  num-
    ber  of  Single-Dish  antenna simultaneously observing. The output table
    has the following format: Number of position x Number  of  antenna  x  2
    (Lambda and Beta coordinates).

2 SKY$
        task\file "Name of sky Image" SKY$

    Filename of input image to be regularly sampled.

2 SAMPLE$
        task\file "Output Table Name" SAMPLE$

    Filename of the output table where the sampling will be stored.

2 NANT$
        task\inte "Number of antenna" NANT$

    Number of single-dish antennas simultaneously observing.

2 DIAM$
        task\real "Antenna Diameter [m]" DIAM$

    Common diameter of the modeled single dish antennas.

2 FREQ$
        task\real "Observing Frequency [GHz]" FREQ$

    Frequency of observation.

2 POINT_PER_BEAM$
        task\inte "Number of Points per Beam" POINT_PER_BEAM$

2 GPOSITION$
        task\inte "Grid Position" GPOSITION$

    1 means centered grid. Other values means that the grid pass through the
    reference pixel. This does not make much difference anyway...

1 ENDOFHELP












