20.22.4 Algorithm

UV_SHORT task computes pseudo-visibilities for short or zero spacings from a single dish table of spectra (Class table) or LMV data cube. These pseudo visibilities are appended to the current (presumably a Mosaic) UV table.

Short spacings are computed when the Interferometer dish diameter is smaller than the Single-dish diameter, Zero spacings otherwise (see HELP UV_SHORT Zero_Spacing for this case)

For short spacings, the command performs two steps

   (1) Creation of a "well behaved" map from the spectra.
   (2) Extraction of UV visibilities from this map.

See HELP UV_SHORT Step_i for detailed explanations of the method steps.

With recent UV tables and Single Dish CLASS table, most parameters are automatically determined. The only parameter to be specified remains SHORT_SD_FACTOR (although that one may also be determined automatically if the input single dish data set is in main-beam brightness temperature).

A parameter set to 0 value indicates the appropriate default should be used.