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In addition to the basic UV_MAP, the following
tasks can also be used to perform analysis or operation on UV tables.
- UV_ASCAL
Self-Calibrate a UV data set. It references the Phases and Amplitudes
to a point source measured (almost) simultaneously.
- UV_CENTER
Find the position of peak emission (for a presumably centro-symmetric
brightness distribution) from UV data.
- UV_CLIP
Clip UV data to flag bad points that escaped previous notice.
- UV_COMPRESS
Compress UV data by spectral channel averaging.
- UV_EXTRACT
Extract some spectral channels from UV table.
- UV_FIT
Fit radial brightness distributions to UV data, and determine
the center of symmetry.
- UV_FITC
A less intelligent, but faster radial brightness distributions fitting
to UV data. The source is assumed to be centered at the phase tracking
center. Combination of
two simple source models is allowed, if both are centro-symmetric around
the same position.
- UV_FLAG
Flag data in a UV table, following conventions similar to those used
in CLIC.
- UV_MERGE
Can merge two different UV tables.
- UV_SHIFT
Displace phase center of a UV data set, and optionally rotate the axis.
- UV_SHORT
Make a ``short spacings'' UV table from a single-dish map (30-m or
other telescope). Can be merged later with another UV table.
Caution: there are some limitations about single-dish map properties
for this method to work.
- UV_SINGLE
Make a ``short spacings'' UV table from a single-dish table (30-m or
other telescope, as produced by CLASScommand GRID). No restriction
of use. Can be merged later with another UV table.
- UV_STAT
Make some ``statistics'' on a UV table. This task actually evaluates
the beam size and noise level under various weighting and tapering
combinations. It can be used prior to UV_MAP to get reasonable
mapping parameters (specially UV_CELL and MAP_CELL).
- UV_ZERO
Add zero spacing flux to a UV table (continuum or line).
- UV_SORT
This task is a necessary step before some tasks can be used.
It sorts UV data in an order appropriate for further
gridding and mapping (negative and increasing V values) (UV order),
or self-calibration and time averaging (TB order).
Next: Display Tools
Up: Tasks
Previous: Image Deconvolution
Gildas manager
2001-04-24