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Rectangle
- Pattern Centre Coords:
- Coords Type: Choose between absolute or relative (to the Field Source) coordinates. Only FK5 J2000 and horizon systems are currently supported.
- Absolute offset inputs:
- Relative offset inputs:
- System:
- Offset(Longitude):
- Offset(Latitude):
- Lat. length: Length of one side of the rectangle.
- Lat. samples per beam (non-editable): A measurement is taken once every integration duration and the sampling velocity should be such that the antenna beam is sufficiently sampled. If the scanning direction is in the latitudinal direction, there should be at least 5 samples per beam and a warning will be issued if this is not the case. If instead the telescope is being scanned longitudinally, the sampling rate should be at least 3beam
.
- Orthogonal step: For raster scans - step size in the direction orthogonal to the scan direction.
- Long. length: Length of the other side of the rectangle.
- Long. samples per beam (non-editable): A measurement is taken once every integration duration and the sampling velocity should be such that the antenna beam is sufficiently sampled. If the scanning direction is in the longitudinal direction, there should be at least 5 samples per beam and a warning will be issued if this is not the case. If instead the telescope is being scanned latitudinally, the sampling rate should be at least 3beam
.
- Scan Direction: For raster scans - the scanning direction for the raster, either in longitude or latitude.
- Scans per map (non-editable): The number of rows in the raster map along which the telescope scans.
- Unidirectional Scan: For raster scans - if checked, each scan will be made in the same direction.
- Scan Velocity: This cannot be set by the user.
- Orientation: Position angle of the rectangle.
- Scanning Coordinate System:
- Setup Mosaic (Optional): If desired, the above-entered rectangle size can be converted to a pointed mosaic. After filling in the following parameters and performing the conversion, the Field Pattern editor will revert to Point and the list of derived pointings will be shown.
- Frequency:
- Overlap:
- Spacing:
- Antenna:
- Layout Type: Triangle patterns are usually used.
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The ALMA OT Team, 2018 Sep 25