[419] | 1 | //#--------------------------------------------------------------------------- |
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| 2 | //# SDPol.cc: Polarimetric functionality |
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| 3 | //#--------------------------------------------------------------------------- |
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| 4 | //# Copyright (C) 2004 |
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| 5 | //# ATNF |
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| 6 | //# |
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| 7 | //# This program is free software; you can redistribute it and/or modify it |
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| 8 | //# under the terms of the GNU General Public License as published by the Free |
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| 9 | //# Software Foundation; either version 2 of the License, or (at your option) |
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| 10 | //# any later version. |
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| 11 | //# |
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| 12 | //# This program is distributed in the hope that it will be useful, but |
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| 13 | //# WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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| 15 | //# Public License for more details. |
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| 16 | //# |
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| 17 | //# You should have received a copy of the GNU General Public License along |
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| 18 | //# with this program; if not, write to the Free Software Foundation, Inc., |
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| 19 | //# 675 Massachusetts Ave, Cambridge, MA 02139, USA. |
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| 20 | //# |
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| 21 | //# Correspondence concerning this software should be addressed as follows: |
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| 22 | //# Internet email: Malte.Marquarding@csiro.au |
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| 23 | //# Postal address: Malte Marquarding, |
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| 24 | //# Australia Telescope National Facility, |
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| 25 | //# P.O. Box 76, |
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| 26 | //# Epping, NSW, 2121, |
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| 27 | //# AUSTRALIA |
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| 28 | //# |
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| 29 | //# $Id: |
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| 30 | //#--------------------------------------------------------------------------- |
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| 31 | |
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| 32 | #include "SDPol.h" |
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[427] | 33 | #include "SDDefs.h" |
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[419] | 34 | |
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| 35 | #include <casa/Arrays/Array.h> |
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| 36 | #include <casa/Arrays/ArrayMath.h> |
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[440] | 37 | #include <casa/Arrays/ArrayLogical.h> |
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[469] | 38 | #include <casa/Arrays/VectorIter.h> |
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[419] | 39 | #include <casa/Containers/Record.h> |
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| 40 | #include <casa/BasicSL/Constants.h> |
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| 41 | #include <casa/BasicSL/String.h> |
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| 42 | #include <casa/Utilities/Assert.h> |
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| 43 | |
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| 44 | #include <tables/Tables/Table.h> |
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| 45 | #include <tables/Tables/ScalarColumn.h> |
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| 46 | #include <tables/Tables/ArrayColumn.h> |
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| 47 | #include <tables/Tables/ColumnDesc.h> |
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| 48 | #include <tables/Tables/TableRecord.h> |
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| 49 | #include <tables/Tables/DataManError.h> |
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| 50 | |
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| 51 | |
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| 52 | using namespace casa; |
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| 53 | using namespace asap; |
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| 54 | |
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| 55 | |
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| 56 | |
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[427] | 57 | SDStokesEngine::SDStokesEngine (const String& outputColumnName, |
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| 58 | const String& inputColumnName) |
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| 59 | : BaseMappedArrayEngine<Float,Float> (outputColumnName, inputColumnName) |
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[459] | 60 | { |
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| 61 | setWritable(False); |
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| 62 | } |
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[419] | 63 | |
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| 64 | |
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| 65 | SDStokesEngine::SDStokesEngine (const Record& spec) |
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| 66 | : BaseMappedArrayEngine<Float,Float> () |
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| 67 | { |
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[459] | 68 | setWritable(False); |
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[427] | 69 | if (spec.isDefined("OUTPUTNAME") && spec.isDefined("INPUTNAME")) { |
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| 70 | setNames (spec.asString("OUTPUTNAME"), spec.asString("INPUTNAME")); |
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[419] | 71 | } |
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| 72 | } |
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| 73 | |
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| 74 | SDStokesEngine::SDStokesEngine (const SDStokesEngine& that) |
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| 75 | : BaseMappedArrayEngine<Float,Float> (that) |
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| 76 | {} |
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| 77 | |
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| 78 | SDStokesEngine::~SDStokesEngine() |
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| 79 | {} |
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| 80 | |
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| 81 | |
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| 82 | DataManager* SDStokesEngine::clone() const |
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| 83 | { |
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| 84 | DataManager* dmPtr = new SDStokesEngine (*this); |
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| 85 | return dmPtr; |
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| 86 | } |
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| 87 | |
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| 88 | |
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| 89 | String SDStokesEngine::dataManagerType() const |
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| 90 | { |
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| 91 | return className(); |
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| 92 | } |
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| 93 | |
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| 94 | String SDStokesEngine::className() |
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| 95 | { |
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| 96 | return "SDStokesEngine"; |
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| 97 | } |
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| 98 | |
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| 99 | String SDStokesEngine::dataManagerName() const |
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| 100 | { |
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[459] | 101 | return virtualName(); |
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[419] | 102 | } |
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| 103 | |
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| 104 | Record SDStokesEngine::dataManagerSpec() const |
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| 105 | { |
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| 106 | Record spec; |
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[459] | 107 | spec.define ("OUTPUTNAME", virtualName()); |
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| 108 | spec.define ("INPUTNAME", storedName()); |
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[419] | 109 | return spec; |
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| 110 | } |
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| 111 | |
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[446] | 112 | DataManager* SDStokesEngine::makeObject (const String&, const Record& spec) |
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[419] | 113 | { |
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| 114 | DataManager* dmPtr = new SDStokesEngine(spec); |
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| 115 | return dmPtr; |
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| 116 | } |
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| 117 | |
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| 118 | |
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| 119 | void SDStokesEngine::registerClass() |
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| 120 | { |
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| 121 | DataManager::registerCtor (className(), makeObject); |
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| 122 | } |
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| 123 | |
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| 124 | |
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| 125 | void SDStokesEngine::create (uInt initialNrrow) |
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| 126 | { |
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| 127 | BaseMappedArrayEngine<Float,Float>::create (initialNrrow); |
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| 128 | } |
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| 129 | |
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| 130 | void SDStokesEngine::prepare() |
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| 131 | { |
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| 132 | BaseMappedArrayEngine<Float,Float>::prepare(); |
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| 133 | } |
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| 134 | |
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| 135 | Bool SDStokesEngine::canAccessArrayColumnCells (Bool& reask) const |
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| 136 | { |
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| 137 | reask = False; |
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| 138 | return True; |
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| 139 | } |
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| 140 | |
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| 141 | |
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[427] | 142 | void SDStokesEngine::getArray (uInt rownr, Array<Float>& output) |
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[419] | 143 | { |
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[437] | 144 | Array<Float> input; |
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[427] | 145 | roColumn().get(rownr, input); |
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[419] | 146 | // |
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[427] | 147 | computeOnGet (output, input); |
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[419] | 148 | } |
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| 149 | |
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[427] | 150 | void SDStokesEngine::putArray (uInt rownr, const Array<Float>& input) |
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[419] | 151 | { |
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| 152 | throw(AipsError("This Virtual Column is not writable")); |
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| 153 | } |
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| 154 | |
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[427] | 155 | |
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| 156 | IPosition SDStokesEngine::shape (uInt rownr) |
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| 157 | { |
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| 158 | IPosition inputShape = roColumn().shape (rownr); |
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| 159 | return findOutputShape(inputShape); |
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| 160 | } |
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| 161 | |
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| 162 | |
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| 163 | |
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| 164 | void SDStokesEngine::computeOnGet(Array<Float>& output, |
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| 165 | const Array<Float>& input) |
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[419] | 166 | // |
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| 167 | // array of shape (nBeam,nIF,nPol,nChan) |
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| 168 | // |
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[498] | 169 | // We use the scaling convention I=(XX+YY)/2 |
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| 170 | |
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[419] | 171 | { |
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[427] | 172 | |
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| 173 | // Checks |
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| 174 | |
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| 175 | const uInt nDim = input.ndim(); |
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[437] | 176 | AlwaysAssert(nDim==4,AipsError); |
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| 177 | AlwaysAssert(output.ndim()==4,AipsError); |
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| 178 | // |
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[427] | 179 | const IPosition inputShape = input.shape(); |
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| 180 | const uInt polAxis = asap::PolAxis; |
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| 181 | const uInt nPol = inputShape(polAxis); |
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[440] | 182 | AlwaysAssert(nPol==1 || nPol==2 || nPol==4, AipsError); |
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[419] | 183 | |
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| 184 | // The silly Array slice operator does not give me back |
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| 185 | // a const reference so have to caste it away |
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| 186 | |
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[427] | 187 | Array<Float>& input2 = const_cast<Array<Float>&>(input); |
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[419] | 188 | |
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[427] | 189 | // Slice coordnates |
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| 190 | |
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[419] | 191 | IPosition start(nDim,0); |
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[427] | 192 | IPosition end(input.shape()-1); |
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[419] | 193 | |
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[427] | 194 | // Generate Slices |
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[419] | 195 | |
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| 196 | start(polAxis) = 0; |
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| 197 | end(polAxis) = 0; |
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[427] | 198 | Array<Float> C1 = input2(start,end); // Input : C1 |
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[419] | 199 | // |
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[427] | 200 | start(polAxis) = 0; |
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| 201 | end(polAxis) = 0; |
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| 202 | Array<Float> I = output(start,end); // Output : I |
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| 203 | // |
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| 204 | if (nPol==1) { |
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[498] | 205 | I = C1; |
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[427] | 206 | return; |
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| 207 | } |
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| 208 | // |
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[419] | 209 | start(polAxis) = 1; |
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| 210 | end(polAxis) = 1; |
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[427] | 211 | Array<Float> C2 = input2(start,end); // Input : C1 |
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[419] | 212 | // |
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[498] | 213 | I = Float(0.5) * (C1 + C2); |
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[427] | 214 | if (nPol <= 2) return; |
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| 215 | // |
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[419] | 216 | start(polAxis) = 2; |
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| 217 | end(polAxis) = 2; |
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[427] | 218 | Array<Float> C3 = input2(start,end); // Input : C3 |
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[419] | 219 | // |
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| 220 | start(polAxis) = 3; |
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| 221 | end(polAxis) = 3; |
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[427] | 222 | Array<Float> C4 = input2(start,end); // Input : C4 |
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[419] | 223 | // |
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| 224 | start(polAxis) = 1; |
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| 225 | end(polAxis) = 1; |
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[427] | 226 | Array<Float> Q = output(start,end); // Output : Q |
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[498] | 227 | Q = Float(0.5) * (C1 - C2); |
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[419] | 228 | // |
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| 229 | start(polAxis) = 2; |
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| 230 | end(polAxis) = 2; |
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[427] | 231 | Array<Float> U = output(start,end); // Output : U |
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[498] | 232 | U = C3; |
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[419] | 233 | // |
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| 234 | start(polAxis) = 3; |
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| 235 | end(polAxis) = 3; |
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[427] | 236 | Array<Float> V = output(start,end); // Output : V |
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[498] | 237 | V = C4; |
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[419] | 238 | } |
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| 239 | |
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| 240 | |
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| 241 | |
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[427] | 242 | IPosition SDStokesEngine::findOutputShape (const IPosition& inputShape) const |
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| 243 | { |
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| 244 | uInt axis = 2; |
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| 245 | uInt nPol = inputShape(axis); |
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| 246 | IPosition outputShape = inputShape; |
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| 247 | if (nPol==1) { |
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| 248 | outputShape(axis) = 1; // XX -> I |
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| 249 | } else if (nPol==2) { |
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| 250 | outputShape(axis) = 1; // XX YY -> I |
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| 251 | } else if (nPol==4) { |
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| 252 | outputShape(axis) = 4; // XX YY R(XY) I(XY) -> I Q U V |
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| 253 | } |
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| 254 | return outputShape; |
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| 255 | } |
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| 256 | |
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| 257 | |
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| 258 | |
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[419] | 259 | // SDPolUtil |
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| 260 | |
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| 261 | Array<Float> SDPolUtil::polarizedIntensity (const Array<Float>& Q, |
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| 262 | const Array<Float>& U) |
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| 263 | { |
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| 264 | Array<Float> t1 = pow(Q,Double(2.0)); |
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| 265 | Array<Float> t2 = pow(U,Double(2.0)); |
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| 266 | return sqrt(t1+t2); |
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| 267 | } |
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| 268 | |
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| 269 | |
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| 270 | Array<Float> SDPolUtil::positionAngle (const Array<Float>& Q, |
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| 271 | const Array<Float>& U) |
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| 272 | { |
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[500] | 273 | return Float(180.0/C::pi/2.0)*atan2(U,Q); // Degrees |
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[419] | 274 | } |
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| 275 | |
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| 276 | |
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[500] | 277 | void SDPolUtil::rotatePhase (Array<Float>& R, |
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| 278 | Array<Float>& I, |
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| 279 | Float phase) |
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| 280 | // |
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| 281 | // Apply phase rotation to Z = (R + iI) |
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| 282 | // |
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[419] | 283 | { |
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| 284 | Float cosVal = cos(C::pi/180.0*phase); |
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| 285 | Float sinVal = sin(C::pi/180.0*phase); |
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| 286 | // |
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[500] | 287 | Array<Float> R2 = R*cosVal - I*sinVal; |
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| 288 | I = R*sinVal + I*cosVal; |
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| 289 | R = R2; |
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[419] | 290 | } |
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| 291 | |
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| 292 | |
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[500] | 293 | void SDPolUtil::rotateLinPolPhase (Array<Float>& C1, |
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| 294 | Array<Float>& C2, |
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| 295 | Array<Float>& C3, |
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| 296 | Array<Float>& I, |
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| 297 | Array<Float>& Q, |
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| 298 | Array<Float>& U, |
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| 299 | Float phase) |
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| 300 | // |
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| 301 | // Rotate P = Q + iU but do it directly on the linear |
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| 302 | // correlations. |
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| 303 | // |
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| 304 | // We are using I=(XX+YY)/2 convention |
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| 305 | // C1 = XX; C2 = YY, C3 = Real(XY) |
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| 306 | // |
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| 307 | { |
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| 308 | // Rotate Q & U (factor of 2 for polarization) |
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[429] | 309 | |
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[500] | 310 | rotatePhase(Q, U, 2.0*phase); |
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| 311 | |
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| 312 | // Now recompute C1,C2,C3 |
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| 313 | // C4 unchanged |
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| 314 | |
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| 315 | C1 = I + Q; |
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| 316 | C2 = I - Q; |
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| 317 | C3 = U; |
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| 318 | } |
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| 319 | |
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| 320 | |
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| 321 | |
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| 322 | |
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| 323 | |
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[429] | 324 | Array<Float> SDPolUtil::getStokesSlice (Array<Float>& in, const IPosition& start, |
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| 325 | const IPosition& end, const String& stokes) |
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| 326 | { |
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| 327 | IPosition s(start); |
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| 328 | IPosition e(end); |
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| 329 | // |
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| 330 | if (stokes=="I") { |
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| 331 | s(asap::PolAxis) = 0; |
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| 332 | e(asap::PolAxis) = 0; |
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| 333 | } else if (stokes=="Q") { |
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| 334 | s(asap::PolAxis) = 1; |
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| 335 | e(asap::PolAxis) = 1; |
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| 336 | } else if (stokes=="U") { |
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| 337 | s(asap::PolAxis) = 2; |
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| 338 | e(asap::PolAxis) = 2; |
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| 339 | } else if (stokes=="V") { |
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| 340 | s(asap::PolAxis) = 3; |
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| 341 | e(asap::PolAxis) = 3; |
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| 342 | } |
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| 343 | // |
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| 344 | return in(s,e); |
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| 345 | } |
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[419] | 346 | |
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[429] | 347 | |
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| 348 | Array<Float> SDPolUtil::circularPolarizationFromStokes (Array<Float>& I, |
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| 349 | Array<Float>& V, |
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| 350 | Bool doRR) |
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[498] | 351 | // |
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| 352 | // We use the convention |
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[673] | 353 | // I = (RR+LL) // definition changed |
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[498] | 354 | // |
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[429] | 355 | { |
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| 356 | if (doRR) { |
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[682] | 357 | return (I + V)/Float(2.0); |
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[429] | 358 | } else { |
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[682] | 359 | return (I - V)/Float(2.0); |
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[429] | 360 | } |
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| 361 | } |
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| 362 | |
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[446] | 363 | Stokes::StokesTypes SDPolUtil::convertStokes(Int val, Bool toStokes, Bool linear) |
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| 364 | { |
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| 365 | Stokes::StokesTypes stokes = Stokes::Undefined; |
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| 366 | if (toStokes) { |
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| 367 | if (val==0) { |
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[492] | 368 | stokes = Stokes::I; |
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[446] | 369 | } else if (val==1) { |
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| 370 | stokes = Stokes::Q; |
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| 371 | } else if (val==2) { |
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| 372 | stokes = Stokes::U; |
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| 373 | } else if (val==3) { |
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| 374 | stokes = Stokes::V; |
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| 375 | } |
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| 376 | } else if (linear) { |
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| 377 | if (val==0) { |
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| 378 | stokes = Stokes::XX; |
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| 379 | } else if (val==1) { |
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| 380 | stokes = Stokes::YY; |
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| 381 | } else if (val==2) { |
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| 382 | stokes = Stokes::XY; // Real(XY) |
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| 383 | } else if (val==3) { |
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| 384 | stokes = Stokes::XY; // Imag(XY) |
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| 385 | } |
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| 386 | } else { |
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| 387 | if (val==0) { |
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| 388 | stokes = Stokes::RR; |
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| 389 | } else if (val==1) { |
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| 390 | stokes = Stokes::LL; |
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| 391 | } else if (val==2) { |
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| 392 | stokes = Stokes::RL; |
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| 393 | } else if (val==3) { |
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| 394 | stokes = Stokes::RL; |
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| 395 | } |
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| 396 | } |
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| 397 | // |
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| 398 | return stokes; |
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| 399 | } |
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[469] | 400 | |
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[492] | 401 | |
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| 402 | |
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| 403 | String SDPolUtil::polarizationLabel (uInt polIdx, Bool linear, Bool stokes, Bool linPol) |
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| 404 | { |
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| 405 | Stokes::StokesTypes type = Stokes::Undefined; |
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| 406 | if (stokes) { |
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| 407 | switch (polIdx) { |
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| 408 | case 0: |
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| 409 | { |
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| 410 | type = Stokes::I; |
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| 411 | } |
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| 412 | break; |
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| 413 | case 1: |
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| 414 | { |
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| 415 | if (linPol) { |
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| 416 | type = Stokes::Plinear; |
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| 417 | } else { |
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| 418 | type = Stokes::Q; |
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| 419 | } |
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| 420 | } |
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| 421 | break; |
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| 422 | case 2: |
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| 423 | { |
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| 424 | if (linPol) { |
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| 425 | type = Stokes::Pangle; |
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| 426 | } else { |
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| 427 | type = Stokes::U; |
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| 428 | } |
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| 429 | } |
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| 430 | break; |
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| 431 | case 3: |
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| 432 | { |
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| 433 | type = Stokes::V; |
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| 434 | } |
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| 435 | break; |
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| 436 | default: |
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| 437 | { |
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| 438 | throw(AipsError("Unknown Stokes type")); |
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| 439 | } |
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| 440 | } |
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| 441 | } else { |
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| 442 | if (linear) { |
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| 443 | switch (polIdx) { |
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| 444 | case 0: |
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| 445 | { |
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| 446 | type = Stokes::XX; |
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| 447 | } |
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| 448 | break; |
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| 449 | case 1: |
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| 450 | { |
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| 451 | type = Stokes::YY; |
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| 452 | } |
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| 453 | break; |
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| 454 | case 2: |
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| 455 | { |
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| 456 | type = Stokes::XY; // Really Real(XY) |
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| 457 | return String("Real(XY)"); |
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| 458 | } |
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| 459 | break; |
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| 460 | case 3: |
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| 461 | { |
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| 462 | type = Stokes::YX; // Really Imag(XY) |
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| 463 | return String("Imag(XY)"); |
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| 464 | } |
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| 465 | break; |
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| 466 | default: |
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| 467 | { |
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| 468 | throw(AipsError("Unknown linear polarization type")); |
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| 469 | } |
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| 470 | } |
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| 471 | } else { |
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| 472 | switch (polIdx) { |
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| 473 | case 0: |
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| 474 | { |
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| 475 | type = Stokes::RR; |
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| 476 | } |
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| 477 | break; |
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| 478 | case 1: |
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| 479 | { |
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| 480 | type = Stokes::LL; |
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| 481 | } |
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[540] | 482 | break; |
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[492] | 483 | case 2: |
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| 484 | { |
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| 485 | type = Stokes::RL; // Really Real(RL) |
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| 486 | return String("Real(RL)"); |
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| 487 | } |
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| 488 | break; |
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| 489 | case 3: |
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| 490 | { |
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| 491 | type = Stokes::LR; // Really Imag(RL) |
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| 492 | return String("Imag(RL)"); |
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| 493 | } |
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| 494 | break; |
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| 495 | default: |
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| 496 | { |
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| 497 | throw(AipsError("Unknown circular polarization type")); |
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| 498 | } |
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| 499 | } |
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| 500 | } |
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| 501 | } |
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| 502 | // |
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| 503 | return SDPolUtil::stokesString(type); |
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| 504 | } |
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| 505 | |
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| 506 | |
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| 507 | |
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| 508 | |
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| 509 | // private |
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| 510 | |
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| 511 | String SDPolUtil::stokesString (Stokes::StokesTypes type) |
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| 512 | { |
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| 513 | return Stokes::name (type); |
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| 514 | } |
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| 515 | |
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| 516 | |
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[469] | 517 | Array<casa::uChar> SDPolUtil::andArrays (const Array<casa::uChar>& in1, |
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| 518 | const Array<casa::uChar>& in2) |
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| 519 | { |
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| 520 | Array<uChar> out(in1.shape()); |
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| 521 | // |
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| 522 | Array<uChar>::const_iterator in1Iter; |
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| 523 | Array<uChar>::const_iterator in2Iter; |
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| 524 | Array<uChar>::iterator outIter; |
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| 525 | // |
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| 526 | for (in1Iter=in1.begin(),in2Iter=in2.begin(),outIter=out.begin(); |
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| 527 | in1Iter!=in1.end(); ++in1Iter,++in2Iter,++outIter) { |
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| 528 | *outIter = *in1Iter & *in2Iter; |
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| 529 | } |
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| 530 | return out; |
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| 531 | } |
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| 532 | |
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| 533 | |
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| 534 | Array<Float> SDPolUtil::extractStokesForWriter (Array<Float>& in, const IPosition& start, const IPosition& end) |
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| 535 | // |
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| 536 | // start/end must already have applied the cursor selection of beam and IF |
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| 537 | // Extract specified Stokes for beam/IF and flip nChan and nPol for bloody SDwriter |
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| 538 | // |
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| 539 | { |
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| 540 | IPosition shapeIn = in.shape(); |
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| 541 | uInt nChan = shapeIn(asap::ChanAxis); |
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| 542 | uInt nPol = shapeIn(asap::PolAxis); |
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| 543 | // |
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| 544 | IPosition shapeOut(2,nChan,nPol); |
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| 545 | Array<Float> out(shapeOut); |
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| 546 | // |
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| 547 | Array<Float> sliceRef = in(start,end); // Beam and IF now degenerate axes |
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| 548 | ReadOnlyVectorIterator<Float> itIn(sliceRef, asap::ChanAxis); |
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| 549 | VectorIterator<Float> itOut(out,0); |
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| 550 | while (!itIn.pastEnd()) { |
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| 551 | itOut.vector() = itIn.vector(); |
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| 552 | // |
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| 553 | itIn.next(); |
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| 554 | itOut.next(); |
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| 555 | } |
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| 556 | // |
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| 557 | return out; |
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| 558 | } |
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| 559 | |
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[492] | 560 | |
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| 561 | |
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| 562 | |
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| 563 | |
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