AIPS NRAO AIPS HELP file for OVERLAP in 31DEC22



As of Sun Aug 14 13:26:59 2022



HELP SECTION

OVERLAP
Type: Adverb  (scalar)
Use:  To specify how overlaps are handled in imaging

Null value: <= 0
      Taken to mean do nothing about overlaps.

Tasks:
    IMAGR........Fourier transforms and Cleans uv data with wide-field,
                 interactive TV, and data weighting options.
                 IMAGR will review each field (if OVERLAP > 0) and see
                 if any components from it also fall in any other field.
                 If so, it will restore them there as well.  Note that
                 this is done by brute force convolution since the
                 components of one field do not fall on the grid points
                 of another field and is therefore fairly slow.
                 In addition, if OVERLAP > 1, IMAGR will use a sequence
                 of Cleaning designed to reduce the instabilities
                 inherent in Cleaning an object from more than one
                 field.  This functions only if DO3DIMAG > 0 as well.
    PDPLT........Plots selected contents of PD tables.  OVERLAP > 0
                 tells the task to plot all antennas on one plot.
    SCIMG........Full-featured imaging plus self-calibration loop with
                 editing.  OVERLAP is used as in IMAGR.
Verbs:
    TV2COLOR.....Verb to activate a 2-color pseudo-color display on the
                 TV.  OVERLAP specifies the fractional overlap of the
                 two colors.
Procedures:
    LINIMAGE.....Build image cube from multi-IF data set.  OVERLAP is
                 passed to IMAGR,

EXPLAIN SECTION


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