[CLEAN\]UV_SHIFT [CenterX CenterY UNIT] [ANGLE Angle] [/FILE
FileInOut]
Shift the current (if no /FILE option is present) or specified (if the
/FILE option is here) UV table (single field or mosaic) to a common
phase center and/or rotate it.
Angle is desired position angle of the Celestial North from the Y axis
(counted positive towards East, i.e. counter-clockwise in usual astro-
nomical images), in Degree. It is thus an absolute value.
If UNIT is ABSOLUTE, CenterX and CenterY are absolute coordinates in
usual sexagesimal notation.
If not, CenterX and CenterY are offsets in the specified angular unit
(SECOND, MINUTE, DEGREE or RADIAN).
Although UV_MAP also provides a direct possibility to re-center the im-
age on a specified projection (phase) center cmobined with a rotation of
the main axes, the modified visibilities cannot be saved on file. It is
sometimes required to do this for specific use. UV_SHIFT provides this
possibility, and the shifted UV table can be written using command WRITE
UV.
UV_DEPROJECT includes the UV_SHIFT capabilities, but also has additional
functions, and a different syntax.
Subsections
Gildas manager
2023-06-01