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1 : //# ViFrequencySelection.h: Step through the MeasurementEquation by visibility
2 : //# Copyright (C) 1996,1997,1998,1999,2000,2001,2002,2003
3 : //# Associated Universities, Inc. Washington DC, USA.
4 : //#
5 : //# This library is free software; you can redistribute it and/or modify it
6 : //# under the terms of the GNU Library General Public License as published by
7 : //# the Free Software Foundation; either version 2 of the License, or (at your
8 : //# option) any later version.
9 : //#
10 : //# This library is distributed in the hope that it will be useful, but WITHOUT
11 : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 : //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13 : //# License for more details.
14 : //#
15 : //# You should have received a copy of the GNU Library General Public License
16 : //# along with this library; if not, write to the Free Software Foundation,
17 : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 : //#
19 : //# Correspondence concerning AIPS++ should be addressed as follows:
20 : //# Internet email: aips2-request@nrao.edu.
21 : //# Postal address: AIPS++ Project Office
22 : //# National Radio Astronomy Observatory
23 : //# 520 Edgemont Road
24 : //# Charlottesville, VA 22903-2475 USA
25 : //#
26 : //# $Id: ViFrequencySelection.h,v 19.14 2006/02/28 04:48:58 mvoronko Exp $
27 :
28 : #if ! defined (MSVIS_ViFrequencySelection_H_121116_1101)
29 : #define MSVIS_ViFrequencySelection_H_121116_1101
30 :
31 : #include <casacore/casa/aips.h>
32 : #include <casacore/casa/BasicSL.h>
33 : #include <casacore/casa/Arrays/Slicer.h>
34 : #include <casacore/measures/Measures/MFrequency.h>
35 :
36 : #include <memory>
37 : #include <set>
38 : #include <vector>
39 :
40 : using std::set;
41 : using std::vector;
42 :
43 : namespace casacore{
44 :
45 : class MeasurementSet;
46 : class MSSelection;
47 : }
48 :
49 : namespace casa { //# NAMESPACE CASA - BEGIN
50 :
51 :
52 : namespace vi {
53 :
54 : ///////////////////////////////////////////////////////////////////
55 : //
56 : // FrequencySelection class
57 : //
58 : // A frequency selection is a way to select the channels of interest from the
59 : // data in a single MeasurementSet. The user will provide one or more selections
60 : // for the casacore::MS; each selection effectively specify the desired channel data in a
61 : // specified spectral window. If the user uses the FrequencySelectionChannel
62 : // class then the selection simply selects a range of channels. The other derived
63 : // class is FrequencySelectionReferential which specifies a range of frequencies
64 : // in a specified frame of reference (e.g., LSRK). Unlike the other first method,
65 : // the frame-related selection will not necessarily select the same channels across
66 : // the entire MS.
67 : //
68 : // The frame of reference will either be one defined in the casacore::MFrequency::Types enum
69 : // or one of the special "frames" defined in this class.
70 :
71 : class FrequencySelection {
72 :
73 : public:
74 :
75 : typedef enum {Unknown = -11, ByChannel = -10} SpecialFrames;
76 :
77 43832 : virtual ~FrequencySelection (){}
78 :
79 : void addCorrelationSlices (const casacore::Vector <casacore::Vector <casacore::Slice> > & slices);
80 : virtual FrequencySelection * clone () const = 0;
81 : virtual casacore::Bool empty () const = 0;
82 : void filterByWindow (casacore::Int windowId = -1) const;
83 : casacore::Vector <casacore::Slice> getCorrelationSlices (casacore::Int polarizationId) const;
84 : casacore::Int getFrameOfReference () const;
85 : virtual set<int> getSelectedWindows () const = 0;
86 : virtual casacore::String toString () const = 0;
87 :
88 : static casacore::String frameName (casacore::Int referenceFrame);
89 :
90 : //**********************************************************************
91 : // Internal methods below this line
92 : //**********************************************************************
93 :
94 : protected:
95 :
96 29839 : FrequencySelection (casacore::Int referenceFrame)
97 29839 : : filterWindowId_p (-1),
98 29839 : referenceFrame_p (referenceFrame) {}
99 : casacore::Int filterWindow() const;
100 :
101 : private:
102 :
103 : casacore::Vector <casacore::Vector <casacore::Slice> > correlationSlices_p; // outer index is polarization id
104 : mutable casacore::Int filterWindowId_p;
105 : casacore::Int referenceFrame_p;
106 : };
107 :
108 : ///////////////////////////////////////////////////////////////////
109 : //
110 : // FrequencySelectionUsingFrame class
111 : //
112 : // Selects sets of channels from a single MS. The selection is created
113 : // by specifying a sequence of frame-related frequencies in a single MS.
114 : // By adding multiple selections, the user can select any arbitrary collecton
115 : // of channels. The frequencies are related to the specified frame of reference
116 : // and the actual selected can be a function of time as the telescope moves through
117 : // space.
118 :
119 : class FrequencySelectionUsingFrame : public FrequencySelection {
120 :
121 : public:
122 :
123 : class Element {
124 : public:
125 :
126 3041 : Element (casacore::Int spectralWindow = -1, double beginFrequency = 0,
127 : double endFrequency = 0, double increment = 0)
128 3041 : : beginFrequency_p (beginFrequency),
129 : endFrequency_p (endFrequency),
130 : increment_p (increment),
131 3041 : spectralWindow_p (spectralWindow)
132 3041 : {}
133 :
134 : double getBeginFrequency () const;
135 : double getEndFrequency () const;
136 : std::pair<int, int> getChannelRange (const casacore::MeasurementSet * ms) const;
137 : int getSpectralWindow () const;
138 :
139 : private:
140 :
141 : friend class FrequencySelectionUsingFrame;
142 :
143 : double beginFrequency_p;
144 : double endFrequency_p;
145 : double increment_p;
146 : int spectralWindow_p;
147 : };
148 :
149 : typedef std::vector<Element> Elements;
150 : typedef Elements::const_iterator const_iterator;
151 :
152 : FrequencySelectionUsingFrame (casacore::MFrequency::Types frameOfReference);
153 :
154 : void add (casacore::Int spectralWindow, double bottomFrequency, double topFrequency);
155 : //void add (casacore::Int spectralWindow, double bottomFrequency, double topFrequency, double increment);
156 : const_iterator begin () const;
157 : FrequencySelection * clone () const;
158 : casacore::Bool empty () const;
159 : const_iterator end () const;
160 : set<int> getSelectedWindows () const;
161 : casacore::String toString () const;
162 : ///This will return a map where the key is the spw and the pair is the pair (nchan, start) for that spw
163 : std::map<int, std::pair<int, int> > getChannelRange (const casacore::MeasurementSet& ms) const;
164 :
165 : private:
166 :
167 : Elements elements_p;
168 : mutable Elements filtered_p;
169 : };
170 :
171 : class SpectralWindowChannels;
172 :
173 : ///////////////////////////////////////////////////////////////////
174 : //
175 : // FrequencySelectionUsingChannels class
176 : //
177 : // Selects sets of channels from a single MS. The selection is created
178 : // by specifying a sequence of channels in a single MS. By adding multiple
179 : // selections, the user can select any arbitrary collecton of channels.
180 : //
181 : // The order of the "add" operations are unimportant.
182 : //
183 : // Imaging finds it convenient to double specify the frequency ranges, first
184 : // using an MSSelection object and later with a series of frequency ranges.
185 : // The intent is that only channels which match up with both criteria should
186 : // be a part of the VisBuffer. To accomplish this, first create a selection
187 : // using a FrequencySelectionUsingChannels object (using method "add" with
188 : // either an MSSelection or a channel range). When that is complete build
189 : // up a FrequencySelectionUsingFrequency object to represent the various
190 : // frequency ranges desired. Then use FrequencySelectionUsingChannels::refine
191 : // passing in the FrequencySelectionUsingFrame object created before. The
192 : // refinement process will remove any of the originalchannels which are not
193 : // within the specified frequency bands. The refinement operation is delayed
194 : // until the first time selection is actually used (usually after a call to
195 : // VisibilityIterator2::origin.
196 :
197 : class FrequencySelectionUsingChannels : public FrequencySelection {
198 :
199 : public:
200 :
201 : class Element {
202 : public:
203 :
204 4341 : Element (casacore::Int spectralWindow = -1, casacore::Int firstChannel = -1, casacore::Int nChannels = -1, casacore::Int increment = 1)
205 4341 : : firstChannel_p (firstChannel),
206 : increment_p (increment),
207 : nChannels_p (nChannels),
208 4341 : spectralWindow_p (spectralWindow)
209 4341 : {}
210 :
211 2318 : casacore::Slice getSlice () const { return casacore::Slice (firstChannel_p, nChannels_p, increment_p);}
212 :
213 : casacore::Int firstChannel_p;
214 : casacore::Int increment_p;
215 : casacore::Int nChannels_p;
216 : casacore::Int spectralWindow_p;
217 : };
218 :
219 : typedef std::vector<Element> Elements;
220 : typedef Elements::const_iterator const_iterator;
221 :
222 25869 : FrequencySelectionUsingChannels () : FrequencySelection (ByChannel){}
223 : FrequencySelectionUsingChannels (const FrequencySelectionUsingChannels & other);
224 :
225 : void add (casacore::Int spectralWindow, casacore::Int firstChannel, casacore::Int nChannels,
226 : casacore::Int increment = 1);
227 : void add (const casacore::MSSelection & msSelection, const casacore::MeasurementSet * ms);
228 : void applyRefinement (std::function <casacore::Slice (int, double, double)>) const;
229 : const_iterator begin () const;
230 : FrequencySelection * clone () const;
231 : casacore::Bool empty () const;
232 : const_iterator end () const;
233 : casacore::Int getNChannels (casacore::Int spectralWindowId) const;
234 : set<int> getSelectedWindows () const;
235 : void refine (const FrequencySelectionUsingFrame & frequencySelection);
236 : bool refinementNeeded () const;
237 : size_t size () const;
238 : casacore::String toString () const;
239 :
240 : //**********************************************************************
241 : // Internal methods below this line
242 : //**********************************************************************
243 :
244 : private:
245 :
246 : mutable Elements elements_p;
247 : mutable Elements filtered_p;
248 : mutable std::unique_ptr<FrequencySelectionUsingFrame> refinements_p;
249 :
250 : // std::pair<int, int> getChannelRange (const SpectralWindowChannels & spwChannels,
251 : // double beginFrequency, double endFrequency);
252 :
253 : void refineSelection (FrequencySelectionUsingChannels::Element & originalElement,
254 : int firstRefiningChannel, int lastRefiningChannel) const;
255 :
256 :
257 : };
258 :
259 :
260 : ///////////////////////////////////////////////////////////////////
261 : //
262 : // FrequencySelections class
263 : //
264 : // A FrequenceSelections object is a collection of FrequencySelection objects.
265 : // It is intended to allow the user to provide a frequency selection per
266 : // casacore::MS when the VisibilityIterator is sweeping multiple MSs. All selections
267 : // included in the collection must have the same frame of reference; an
268 : // exception will be thrown when attempting to add a frame with a different
269 : // frame of reference.
270 :
271 : class FrequencySelections {
272 : public:
273 :
274 :
275 : FrequencySelections ();
276 : FrequencySelections (const FrequencySelections & other);
277 : ~FrequencySelections ();
278 :
279 : void add (const FrequencySelection & selection);
280 : FrequencySelections * clone () const;
281 : void filterToSpectralWindow (casacore::Int spectralWindowId);
282 : const FrequencySelection & get (casacore::Int msIndex) const;
283 : casacore::Int getFrameOfReference () const;
284 : casacore::Bool isSpectralWindowSelected (casacore::Int msIndex, casacore::Int spectralWindowId) const;
285 : casacore::Int size () const;
286 :
287 : //**********************************************************************
288 : // Internal methods below this line
289 : //**********************************************************************
290 :
291 :
292 : private:
293 :
294 : typedef std::set<std::pair<casacore::Int, casacore::Int> > SelectedWindows; // pair=(msIndex,spwId)
295 :
296 : const FrequencySelectionUsingChannels defaultSelection_p;
297 : mutable casacore::Int filterWindow_p;
298 : SelectedWindows selectedWindows_p;
299 :
300 : typedef std::vector<FrequencySelection *> Selections;
301 : Selections selections_p;
302 : };
303 :
304 :
305 :
306 : } // end namespace vi
307 :
308 : } //# NAMESPACE CASA - END
309 :
310 : #endif // ! defined (MSVIS_ViFrequencySelection_H_121116_1101)
311 :
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