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UVMAP

Procedure to compute a dirty map (with extension lmv) and beam (with extension beam) from uv-tables. For mosaics a unique dirty image is created, as well as individual ones for each field. UVMAP estimates which are the best values for pixel and map sizes. We recommend to use them. By default images are created by using natural weights for the visibilities. Uniform weights can be defined in the widget (see Fig. [*]), but indeed correspond to robust weighting.

Figure: UMAR parameters, to create a dirty (.lmv) image.

Image pdbi-cookbook-25

UVSTAT weight/taper The advantages and inconveniences of modifying the weights from natural to robust are quantified, and numbers are shown by UVSTAT in mode weight. The advantages and inconveniences of tapering can be verified with UVSTAT in mode taper.


DIRTY/BEAM/PRIMARY/WEIGHTS at the top of the imaging widget (Fig. [*]) are aimed to plot the results from UVMAP, that is ``mytable''.lmv, ``mytable''.beam, and, if mosaicing, also ``mytable''.lobe and ``mytable''.weight.



\begin{table}{\it\small
\par
\noindent
At the prompt:\\
Procedure: {\tt go uv\_...
...v} \\
{\tt let type beam} \\
{\tt let first 7} \\
\end{minipage}}
\end{table}


next up previous contents
Next: SUPPORT Up: Imaging and deconvolution Previous: UVSHORT   Contents
Gildas manager 2014-07-01