[419] | 1 | //#--------------------------------------------------------------------------- |
---|
| 2 | //# SDPol.cc: Polarimetric functionality |
---|
| 3 | //#--------------------------------------------------------------------------- |
---|
| 4 | //# Copyright (C) 2004 |
---|
| 5 | //# ATNF |
---|
| 6 | //# |
---|
| 7 | //# This program is free software; you can redistribute it and/or modify it |
---|
| 8 | //# under the terms of the GNU General Public License as published by the Free |
---|
| 9 | //# Software Foundation; either version 2 of the License, or (at your option) |
---|
| 10 | //# any later version. |
---|
| 11 | //# |
---|
| 12 | //# This program is distributed in the hope that it will be useful, but |
---|
| 13 | //# WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 14 | //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
---|
| 15 | //# Public License for more details. |
---|
| 16 | //# |
---|
| 17 | //# You should have received a copy of the GNU General Public License along |
---|
| 18 | //# with this program; if not, write to the Free Software Foundation, Inc., |
---|
| 19 | //# 675 Massachusetts Ave, Cambridge, MA 02139, USA. |
---|
| 20 | //# |
---|
| 21 | //# Correspondence concerning this software should be addressed as follows: |
---|
| 22 | //# Internet email: Malte.Marquarding@csiro.au |
---|
| 23 | //# Postal address: Malte Marquarding, |
---|
| 24 | //# Australia Telescope National Facility, |
---|
| 25 | //# P.O. Box 76, |
---|
| 26 | //# Epping, NSW, 2121, |
---|
| 27 | //# AUSTRALIA |
---|
| 28 | //# |
---|
| 29 | //# $Id: |
---|
| 30 | //#--------------------------------------------------------------------------- |
---|
| 31 | |
---|
| 32 | #include "SDPol.h" |
---|
| 33 | |
---|
| 34 | #include <casa/Arrays/Array.h> |
---|
| 35 | #include <casa/Arrays/ArrayMath.h> |
---|
| 36 | #include <casa/Containers/Record.h> |
---|
| 37 | #include <casa/BasicSL/Constants.h> |
---|
| 38 | #include <casa/BasicSL/String.h> |
---|
| 39 | #include <casa/Utilities/Assert.h> |
---|
| 40 | |
---|
| 41 | #include <tables/Tables/Table.h> |
---|
| 42 | #include <tables/Tables/ScalarColumn.h> |
---|
| 43 | #include <tables/Tables/ArrayColumn.h> |
---|
| 44 | #include <tables/Tables/ColumnDesc.h> |
---|
| 45 | #include <tables/Tables/TableRecord.h> |
---|
| 46 | #include <tables/Tables/DataManError.h> |
---|
| 47 | |
---|
| 48 | |
---|
| 49 | using namespace casa; |
---|
| 50 | using namespace asap; |
---|
| 51 | |
---|
| 52 | |
---|
| 53 | |
---|
| 54 | SDStokesEngine::SDStokesEngine (const String& sourceColumnName, |
---|
| 55 | const String& targetColumnName) |
---|
| 56 | |
---|
| 57 | : BaseMappedArrayEngine<Float,Float> (sourceColumnName, targetColumnName) |
---|
| 58 | {} |
---|
| 59 | |
---|
| 60 | |
---|
| 61 | SDStokesEngine::SDStokesEngine (const Record& spec) |
---|
| 62 | : BaseMappedArrayEngine<Float,Float> () |
---|
| 63 | { |
---|
| 64 | if (spec.isDefined("SOURCENAME") && spec.isDefined("TARGETNAME")) { |
---|
| 65 | setNames (spec.asString("SOURCENAME"), spec.asString("TARGETNAME")); |
---|
| 66 | } |
---|
| 67 | } |
---|
| 68 | |
---|
| 69 | SDStokesEngine::SDStokesEngine (const SDStokesEngine& that) |
---|
| 70 | : BaseMappedArrayEngine<Float,Float> (that) |
---|
| 71 | {} |
---|
| 72 | |
---|
| 73 | SDStokesEngine::~SDStokesEngine() |
---|
| 74 | {} |
---|
| 75 | |
---|
| 76 | |
---|
| 77 | DataManager* SDStokesEngine::clone() const |
---|
| 78 | { |
---|
| 79 | DataManager* dmPtr = new SDStokesEngine (*this); |
---|
| 80 | return dmPtr; |
---|
| 81 | } |
---|
| 82 | |
---|
| 83 | |
---|
| 84 | String SDStokesEngine::dataManagerType() const |
---|
| 85 | { |
---|
| 86 | return className(); |
---|
| 87 | } |
---|
| 88 | |
---|
| 89 | String SDStokesEngine::className() |
---|
| 90 | { |
---|
| 91 | return "SDStokesEngine"; |
---|
| 92 | } |
---|
| 93 | |
---|
| 94 | String SDStokesEngine::dataManagerName() const |
---|
| 95 | { |
---|
| 96 | return sourceName(); |
---|
| 97 | } |
---|
| 98 | |
---|
| 99 | Record SDStokesEngine::dataManagerSpec() const |
---|
| 100 | { |
---|
| 101 | Record spec; |
---|
| 102 | spec.define ("SOURCENAME", sourceName()); |
---|
| 103 | spec.define ("TARGETNAME", targetName()); |
---|
| 104 | return spec; |
---|
| 105 | } |
---|
| 106 | |
---|
| 107 | DataManager* SDStokesEngine::makeObject (const String&, |
---|
| 108 | const Record& spec) |
---|
| 109 | { |
---|
| 110 | DataManager* dmPtr = new SDStokesEngine(spec); |
---|
| 111 | return dmPtr; |
---|
| 112 | } |
---|
| 113 | |
---|
| 114 | |
---|
| 115 | void SDStokesEngine::registerClass() |
---|
| 116 | { |
---|
| 117 | DataManager::registerCtor (className(), makeObject); |
---|
| 118 | } |
---|
| 119 | |
---|
| 120 | |
---|
| 121 | void SDStokesEngine::create (uInt initialNrrow) |
---|
| 122 | { |
---|
| 123 | BaseMappedArrayEngine<Float,Float>::create (initialNrrow); |
---|
| 124 | } |
---|
| 125 | |
---|
| 126 | void SDStokesEngine::prepare() |
---|
| 127 | { |
---|
| 128 | BaseMappedArrayEngine<Float,Float>::prepare(); |
---|
| 129 | } |
---|
| 130 | |
---|
| 131 | Bool SDStokesEngine::canAccessArrayColumnCells (Bool& reask) const |
---|
| 132 | { |
---|
| 133 | reask = False; |
---|
| 134 | return True; |
---|
| 135 | } |
---|
| 136 | |
---|
| 137 | |
---|
| 138 | void SDStokesEngine::getArray (uInt rownr, Array<Float>& array) |
---|
| 139 | { |
---|
| 140 | Array<Float> target(array.shape()); |
---|
| 141 | roColumn().get(rownr, target); |
---|
| 142 | // |
---|
| 143 | computeOnGet (array, target); |
---|
| 144 | } |
---|
| 145 | |
---|
| 146 | void SDStokesEngine::putArray (uInt rownr, const Array<Float>& array) |
---|
| 147 | { |
---|
| 148 | throw(AipsError("This Virtual Column is not writable")); |
---|
| 149 | } |
---|
| 150 | |
---|
| 151 | |
---|
| 152 | |
---|
| 153 | void SDStokesEngine::computeOnGet(Array<Float>& array, |
---|
| 154 | const Array<Float>& target) |
---|
| 155 | // |
---|
| 156 | // array of shape (nBeam,nIF,nPol,nChan) |
---|
| 157 | // |
---|
| 158 | { |
---|
| 159 | DebugAssert(target.ndim()==4,AipsError); |
---|
| 160 | DebugAssert(array.ndim()==4,AipsError); |
---|
| 161 | |
---|
| 162 | // The silly Array slice operator does not give me back |
---|
| 163 | // a const reference so have to caste it away |
---|
| 164 | |
---|
| 165 | Array<Float>& target2 = const_cast<Array<Float>&>(target); |
---|
| 166 | |
---|
| 167 | // uInt polAxis = asap::PolAxis; |
---|
| 168 | uInt polAxis = 2; |
---|
| 169 | // |
---|
| 170 | const uInt nDim = target.ndim(); |
---|
| 171 | IPosition start(nDim,0); |
---|
| 172 | IPosition end(target.shape()-1); |
---|
| 173 | |
---|
| 174 | // Input slices |
---|
| 175 | |
---|
| 176 | start(polAxis) = 0; |
---|
| 177 | end(polAxis) = 0; |
---|
| 178 | Array<Float> C1 = target2(start,end); |
---|
| 179 | // |
---|
| 180 | start(polAxis) = 1; |
---|
| 181 | end(polAxis) = 1; |
---|
| 182 | Array<Float> C2 = target2(start,end); |
---|
| 183 | // |
---|
| 184 | start(polAxis) = 2; |
---|
| 185 | end(polAxis) = 2; |
---|
| 186 | Array<Float> C3 = target2(start,end); |
---|
| 187 | // |
---|
| 188 | start(polAxis) = 3; |
---|
| 189 | end(polAxis) = 3; |
---|
| 190 | Array<Float> C4 = target2(start,end); |
---|
| 191 | |
---|
| 192 | // Compute Output slices |
---|
| 193 | |
---|
| 194 | start(polAxis) = 0; |
---|
| 195 | end(polAxis) = 0; |
---|
| 196 | Array<Float> I = array(start,end); |
---|
| 197 | I = Float(0.5)*(C1 + C2); |
---|
| 198 | // |
---|
| 199 | start(polAxis) = 1; |
---|
| 200 | end(polAxis) = 1; |
---|
| 201 | Array<Float> Q = array(start,end); |
---|
| 202 | Q = Float(0.5)*(C1 - C2); |
---|
| 203 | // |
---|
| 204 | start(polAxis) = 2; |
---|
| 205 | end(polAxis) = 2; |
---|
| 206 | Array<Float> U = array(start,end); |
---|
| 207 | U = C3; |
---|
| 208 | // |
---|
| 209 | start(polAxis) = 3; |
---|
| 210 | end(polAxis) = 3; |
---|
| 211 | Array<Float> V = array(start,end); |
---|
| 212 | V = C4; |
---|
| 213 | } |
---|
| 214 | |
---|
| 215 | |
---|
| 216 | |
---|
| 217 | |
---|
| 218 | // SDPolUtil |
---|
| 219 | |
---|
| 220 | Array<Float> SDPolUtil::polarizedIntensity (const Array<Float>& Q, |
---|
| 221 | const Array<Float>& U) |
---|
| 222 | { |
---|
| 223 | Array<Float> t1 = pow(Q,Double(2.0)); |
---|
| 224 | Array<Float> t2 = pow(U,Double(2.0)); |
---|
| 225 | return sqrt(t1+t2); |
---|
| 226 | } |
---|
| 227 | |
---|
| 228 | |
---|
| 229 | Array<Float> SDPolUtil::positionAngle (const Array<Float>& Q, |
---|
| 230 | const Array<Float>& U) |
---|
| 231 | { |
---|
| 232 | return Float(180.0/C::pi/2.0)*atan2(Q,U); |
---|
| 233 | } |
---|
| 234 | |
---|
| 235 | |
---|
| 236 | void SDPolUtil::rotateXYPhase (Array<Float>& C3, |
---|
| 237 | Array<Float>& C4, |
---|
| 238 | Float phase) |
---|
| 239 | { |
---|
| 240 | Float cosVal = cos(C::pi/180.0*phase); |
---|
| 241 | Float sinVal = sin(C::pi/180.0*phase); |
---|
| 242 | // |
---|
| 243 | C3 = C3*cosVal - C4*sinVal; |
---|
| 244 | C4 = C3*sinVal + C4*cosVal; |
---|
| 245 | } |
---|
| 246 | |
---|
| 247 | |
---|
| 248 | |
---|