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Point

For each source, multiple pointing centres can be specified byclicking the Add button in the Point panel below the FieldPatternEditor panel. The positions of the pointings can beentered into this panel in either absolute or relative (to the sourceposition) coordinates.

Alternatively, pointings can be added using the FOV icon in thetoolbar above the image display - clicking in the image display willcreate the new pointing and a circle and a plus marker will becomevisible. The plus indicates the pointing position; the size of thecircle represents the FOV. To adjust a pointing position select thepointing position using the left mouse button. The pointing marker inthe image display will turn grey and can be dragged.

As mentioned above, these parameters are identical to those in thecorresponding form editor (chosen using the tab next to the Spatialtab). For relative as well absolute field centre coordinates, whenmoving the pointing position in the image display the correspondingfields values in the form will also change. In the case of relativepointing coordinates, when moving the source position in the imagedisplay the pointing position will also change.

In order to calculate the FOV the frequency and the antenna diameterneed to be specified. This can be done in the FOV Parameters panel below the image display. To tell the Visual Spatial Editor whichfrequency is to be used, one needs to specify a frequency in the Frequency used field. In case a frequency has already been defined,in either an Instrument Setup or Observing Parameters definition, the Refresh button can be used.


next up previous contents index
Next: Rectangle Up: Field Patterns for Scheduling Previous: Field Patterns for Scheduling   Contents   Index
The ALMA OT Team, 2011 May 20