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« prev ^ index » next coverage.py v7.6.4, created at 2024-10-31 19:53 +0000
1##################### generated by xml-casa (v2) from uvcontsub_old.xml #############
2##################### f0f0b427965b14190ecdd5e50a5251e8 ##############################
3from __future__ import absolute_import
4import numpy
5from casatools.typecheck import CasaValidator as _val_ctor
6_pc = _val_ctor( )
7from casatools.coercetype import coerce as _coerce
8from casatools.errors import create_error_string
9from .private.task_uvcontsub_old import uvcontsub_old as _uvcontsub_old_t
10from casatasks.private.task_logging import start_log as _start_log
11from casatasks.private.task_logging import end_log as _end_log
12from casatasks.private.task_logging import except_log as _except_log
14class _uvcontsub_old:
15 """
16 uvcontsub_old ---- Continuum fitting and subtraction in the uv plane
18 --------- parameter descriptions ---------------------------------------------
20 vis Name of input MS. Output goes to vis + ".contsub" (will be overwritten if already exists)
21 field Select field(s) using id(s) or name(s)
22 fitspw Spectral window:channel selection for fitting the continuum
23 excludechans exclude Spectral window:channel selection in fitspw for fitting
24 combine Data axes to combine for the continuum estimation (none, or spw and/or scan)
25 solint Continuum fit timescale (int recommended!)
26 fitorder Polynomial order for the fits
27 spw Spectral window selection for output
28 want_cont Create vis + ".cont" to hold the continuum estimate.
30 --------- examples -----------------------------------------------------------
34 Continuum fitting and subtraction in the uv plane:
36 This task estimates the continuum emission by fitting polynomials to
37 the real and imaginary parts of the spectral windows and channels
38 selected by fitspw. This fit represents a model of the continuum in
39 all channels.
41 The fitted continuum spectrum is subtracted from all channels
42 selected in spw, and the result (presumably only line emission)
43 is stored in a new MS (vis + ".contsub"). If an MS
44 with the output name already exists, it will be overwritten.
45 It will read from the CORRECTED_DATA column of vis if it is present,
46 or DATA if it is not. Whichever column is read is presumed to have
47 already been calibrated.
49 If want_cont is True, the continuum fit is placed in a second new MS
50 (vis + '.cont', also overwritten if it already exists).
51 N.B. because the continuum model is necessarily a
52 smoothed fit, images made with it are liable to have their field of
53 view reduced in some strange way. Images of the continuum should be
54 made by simply excluding the line channels (and probably averaging the
55 remaining ones) in clean.
57 Keyword arguments:
58 vis -- Name of input visibility file
59 default: none; example: vis='ngc5921.ms'
60 field -- Field selection for continuum estimation and subtraction.
61 The estimation and subtraction is done for each selected field
62 in turn. (Run listobs to get lists of the ID and names.)
63 default: field = '' means select all fields
64 field = 1 # will get field_id=1 (if you give it an
65 integer, it will retrieve the source with that index.
66 field = '1328+307' specifies source '1328+307'
67 field = '13*' will retrieve '1328+307' and any other fields
68 beginning with '13'
69 fitspw -- Selection of spectral windows and channels to use in the
70 fit for the continuum, using general spw:chan syntax.
71 The ranges of channels also can be specified by frequencies as in
72 the MS selection syntax (spw ids are required but '*' can be
73 used, see the example below).
74 See the note under combine.
75 default: '' (all)
76 example: fitspw='0:5~30;40~55'
77 --> select the ranges by channels in the spw id 0
78 fitspw='0:5~30;40~55,1:10~25;45~58,2'
79 --> select channel ranges 5-30 and 40-55 for the spw id 0,
80 10-25 and 45-58 for spwid 1, and use all channels for the spw id 2
81 fitspw='0:113.767~114.528GHz;114.744~115.447GHz'
82 --> select the ranges by frequencies in the spw id 0
83 fitspw='0:113.767~114.528GHz;114.744~115.447GHz,1:111.892~112.654GHz;112.868~113.025GHz'
84 --> select the different ranges by frequencies for the spw ids 0 and 1
85 fitspw='*:113.767~114.528GHz;114.744~115.447GHz'
86 --> select the same frequency ranges for all the relevant spws
87 >>> expandable parameter for fitspw
88 excludechans - if True, it will exclude the spws:channels specified in fitspw
89 for the fit
90 default: False (use fitspw for the fit)
91 example: fitspw='0:114.528GHz~114.744GHz'; excludechans=True
92 --> exclude the frequency range, 114.528GHz - 114.744GHz in the spw id 0
93 combine -- Data axes to combine for the continuum estimate.
94 It must include 'spw' if spw contains spws that are not in
95 fitspw!
96 default: '' --> solutions will break at scan, field, and spw
97 boundaries according to solint
98 Options: '', 'spw'', 'scan', or 'spw, scan'
99 example: combine='spw' --> form spw-merged continuum estimate
100 solint -- Timescale for per-baseline fit (units optional)
101 default (recommended): 'int' --> no time averaging, do a
102 fit for each integration and let the
103 noisy fits average out in the image.
105 example: solint='10s' --> average to 10s before fitting
106 10 or '10' --> '10s' (unitless: assumes seconds)
107 options: 'int' --> per integration
108 'inf' --> per scan
110 If solint is longer than 'int', the continuum estimate can be
111 corrupted by time smearing!
113 fitorder -- Polynomial order for the fits of the continuum w.r.t.
114 frequency. fitorders > 1 are strongly discouraged
115 because high order polynomials have more flexibility, may
116 absorb line emission, and tend go wild at the edges of
117 fitspw, which is not what you want.
119 default: 0 (constant); example: fitorder=1
121 spw -- Optional per spectral window selection of channels to include
122 in the output. See the note under combine.
124 The spectral windows will be renumbered to start from 0, as in
125 split.
126 want_cont -- Create vis + '.cont' to hold the continuum estimate.
127 default: 'False'; example: want_cont=True
128 The continuum estimate will be placed in vis + '.cont'
131 """
133 _info_group_ = """manipulation"""
134 _info_desc_ = """Continuum fitting and subtraction in the uv plane"""
136 def __call__( self, vis='', field='', fitspw='', excludechans=False, combine='', solint='int', fitorder=int(0), spw='', want_cont=False ):
137 schema = {'vis': {'type': 'cReqPath', 'coerce': _coerce.expand_path}, 'field': {'anyof': [{'type': 'cStr', 'coerce': _coerce.to_str}, {'type': 'cStrVec', 'coerce': [_coerce.to_list,_coerce.to_strvec]}, {'type': 'cInt'}, {'type': 'cIntVec', 'coerce': [_coerce.to_list,_coerce.to_intvec]}]}, 'fitspw': {'type': 'cStr', 'coerce': _coerce.to_str}, 'excludechans': {'type': 'cBool'}, 'combine': {'type': 'cStr', 'coerce': _coerce.to_str}, 'solint': {'type': 'cVariant', 'coerce': [_coerce.to_variant]}, 'fitorder': {'type': 'cInt'}, 'spw': {'type': 'cStr', 'coerce': _coerce.to_str}, 'want_cont': {'type': 'cBool'}}
138 doc = {'vis': vis, 'field': field, 'fitspw': fitspw, 'excludechans': excludechans, 'combine': combine, 'solint': solint, 'fitorder': fitorder, 'spw': spw, 'want_cont': want_cont}
139 assert _pc.validate(doc,schema), create_error_string(_pc.errors)
140 _logging_state_ = _start_log( 'uvcontsub_old', [ 'vis=' + repr(_pc.document['vis']), 'field=' + repr(_pc.document['field']), 'fitspw=' + repr(_pc.document['fitspw']), 'excludechans=' + repr(_pc.document['excludechans']), 'combine=' + repr(_pc.document['combine']), 'solint=' + repr(_pc.document['solint']), 'fitorder=' + repr(_pc.document['fitorder']), 'spw=' + repr(_pc.document['spw']), 'want_cont=' + repr(_pc.document['want_cont']) ] )
141 task_result = None
142 try:
143 task_result = _uvcontsub_old_t( _pc.document['vis'], _pc.document['field'], _pc.document['fitspw'], _pc.document['excludechans'], _pc.document['combine'], _pc.document['solint'], _pc.document['fitorder'], _pc.document['spw'], _pc.document['want_cont'] )
144 except Exception as exc:
145 _except_log('uvcontsub_old', exc)
146 raise
147 finally:
148 task_result = _end_log( _logging_state_, 'uvcontsub_old', task_result )
149 return task_result
151uvcontsub_old = _uvcontsub_old( )