Source code for casatasks.manipulation.fixplanets

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[docs]def fixplanets(vis, field='""', fixuvw=False, direction='', refant='0', reftime='first'): r""" Changes FIELD and SOURCE table entries based on user-provided direction or POINTING table, optionally fixes the UVW coordinates [`Description`_] [`Examples`_] [`Development`_] [`Details`_] Parameters - vis_ (path) - Name of input visibility file - field_ (variant='""') - Select field using field id(s) or field name(s) - fixuvw_ (bool=False) - Recalculate Fourier-plane u,v,w coordinates - direction_ (variant='') - If set, do not use pointing table but set direction to this value - refant_ (variant='0') - Reference antenna name(s) - reftime_ (string='first') - If using pointing table information, use it from this timestamp .. _Description: Description .. warning:: There are `Known Issues <../../notebooks/introduction.html#Known-Issues>`__ for fixplanets. The main purpose of this task is to correct observations which were performed with correct pointing and correlation but for which incorrect direction information was entered in the FIELD and SOURCE table of the MS. This may be the case if the data is old and there is no ephemeris table attached to the MS (in which case, use **fixplanets** with the parameter *direction* set in order to attach one), if improved ephemerides have become available, or if a fixed direction is needed to allow concatenation (using **fixplanets** as an alternative to **concat**). If you actually want to change the phase center of the visibilties in an MS, you should use task **fixvis**. .. rubric:: Parameter descriptions *vis* Name of the input visibility set. *field* Field selection string. *fixuvw* Recalculates the uvw coordinates (default: False). *direction* If set, **fixplanets** doesn't use the pointing table but sets the direction to this value. default= '' (use pointing table); example: 'J2000 19h30m00 -40d00m00'. The direction can either be given explicitly or as the path to a JPL Horizons ephemeris table, which is generated by running **getephemtable**. *refant* If using pointing table information, use it from this antenna. default: 0 (antenna id 0); examples: 'DV06' (antenna with name DV06); 3 (antenna id 3). *reftime* If using pointing table information, use it from this timestamp. default: 'first'; examples: 'median' will use the median timestamp for the given field using only the unflagged maintable rows; '2012/07/11/08:41:32' will use the given timestamp (must be within the observaton time). .. _Examples: Examples To look up the pointing direction from antenna 0 for field 'Titan' in the POINTING table based on the first timestamp in the main table rows for this field, write this direction in the FIELD and SOURCE tables, and then recalculate the UVW coordinates for this field: :: fixplanets(vis='uid___A002_X1c6e54_X223.ms', field='Titan', fixuvw=True) To attach the ephemeris table 'Titan_55438-56292dUTC.tab' to field 'Titan' and then recalculate the UVW coordinates for this field: :: fixplanets(vis='uid___A002_X1c6e54_X223.ms', field='Titan', fixuvw=True, direction='Titan_55438-56292dUTC.tab') To set the directions for field 'Titan' in the FIELD and SOURCE table to the given direction and not recalculate the UVW coordinates; this can be useful for several purposes, among them preparing a concatenation of datasets. (Only fields with the same direction will be recognised as identical.): :: fixplanets(vis='uid___A002_X1c6e54_X223.ms', field='Titan', fixuvw=False, direction='J2000 12h30m15 -02d12m00') .. _Development: Development No additional development details .. _Details: Parameter Details Detailed descriptions of each function parameter .. _vis: | ``vis (path)`` - Name of input visibility file | Default: none | Example: vis='ngc5921.ms' .. _field: | ``field (variant='""')`` - Select field using field id(s) or field name(s) | Default: '' (all fields) | | Use 'go listobs' to obtain the list id's or | names. If field string is a non-negative integer, | it is assumed a field index, otherwise, it is | assumed a field name. | Examples: | field='0~2'; field ids 0,1,2 | field='0,4,5~7'; field ids 0,4,5,6,7 | field='3C286,3C295'; field named 3C286 and | 3C295 | field = '3,4C*'; field id 3, all names | starting with 4C .. _fixuvw: | ``fixuvw (bool=False)`` - Recalculate Fourier-plane u,v,w coordinates? | Default: False | Options: False|True .. _direction: | ``direction (variant='')`` - If set, do not use pointing table but set direction to | this value | Default: '' (use pointing table) | Example: 'J2000 19h30m00 -40d00m00' | The direction can either be given explicitly or | as the path to a JPL Horizons | ephemeris. Alternatively, the ephemeris table can | also be provided as mime format file. For more | information, see the task pages of fixplanets in | CASA Docs (https://casa.nrao.edu/casadocs/). .. _refant: | ``refant (variant='0')`` - Reference antenna name(s); a prioritized list may be | specified | Default: 0 (antenna ID 0) | Examples: | refant='4' (antenna with index 4) | refant='VA04' (VLA antenna #4) | refant='EA02,EA23,EA13' (EVLA antenna EA02, | use EA23 and EA13 as alternates if/when EA02 | drops out) | Use taskname=listobs for antenna listing .. _reftime: | ``reftime (string='first')`` - If using pointing table information, use it from this | timestamp | Default: 'first' | Examples: | * 'median' will use the median timestamp for | the given field using only the unflagged | maintable rows | * '2012/07/11/08:41:32' will use the given | timestamp (must be within the observaton | time) """ pass