Keywords: mapping-noema

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# Control parameters

The UV_MAP command is controlled by a set of SIC variables of names starting by MAP_

    		 MAP_ANGLE 		  Position angle of map axis when MAP_SHIFT is set

    MAP_BEAM_STEP 		  Number of channels per common dirty beam, if . If 0, only one

    beam is produced in total. If , an automatic guess is performed

    from the map size and requested precision (MAP_PRECIS).

    MAP_CONVOLUTION 		  Convolution mode (default 5) (old name CONVOLUTION)

    MAP_CELL 		 Pixel size in arcsecond

    MAP_DEC 		 Declination of new map center

    MAP_FIELD 		 Image size in arcsecond

    MAP_PRECIS 		 Position precision at edge of image, in fraction of pixel size. Default

    is 0.1.

    MAP_POWER 		 Rounding scheme for default image size, to numbers like 2n 3p 5q.

    p and q are less or equal to MAP_POWER.

    MAP_RA 		   Right ascension of new map center

    MAP_ROBUST 		   Robust weighting factor, in range 0 - infty.  Default 1.0. (Old name

    UV_CELL[1])

    0 means  Natural weighting (as infty, actually)

    MAP_ROUNDING 		 Tolerance to round image size by floor instead of ceiling.

    MAP_SHIFT 		  Logical indicating whether the phase center must be shifted and/or

    the image rotated (old name UV_SHIFT).

    MAP_SIZE 		   Image size in pixels

    MAP_TAPEREXPO 		  the taper exponent. Default 2 (Old name TAPER_EXPO).

    MAP_UVCELL 		  UV Cell size for Robust weighting. Default is 0, meaning that the

    cell size is derived from the antenna diameter. (Old name

    UV_CELL[2])

    MAP_UVTAPER 		   Array of 3 values giving  the UV taper in m (first two values), its

    position angle (third value).  Default (0,0,0). (Old name

    UV_TAPER[3]).

    MAP_VERSION 		  Version of code to be used. This is a temporary variable to allow

    comparison between the new and old codes without quitting

    MAPPING.

In addition, WCOL indicates the weight channel and MCOL the channel range to be imaged. However, WCOL should in general be set to zero to allow the beam steps to be set.

The old code can still be executed by setting MAP_VERSION = -1. MAP_VERSION set to 0 (the default) uses the new code, and MAP_VERSION = 1 allows access to an intermediate version.

Subsections

- Implementation issues
- Additional Capabilities

Next: Implementation issues Up: IRAM Memo 2016-? New Previous: Short Spacings Contents