[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" |
---|
[427] | 33 | #include "SDDefs.h" |
---|
[419] | 34 | |
---|
| 35 | #include <casa/Arrays/Array.h> |
---|
| 36 | #include <casa/Arrays/ArrayMath.h> |
---|
[440] | 37 | #include <casa/Arrays/ArrayLogical.h> |
---|
[419] | 38 | #include <casa/Containers/Record.h> |
---|
| 39 | #include <casa/BasicSL/Constants.h> |
---|
| 40 | #include <casa/BasicSL/String.h> |
---|
| 41 | #include <casa/Utilities/Assert.h> |
---|
| 42 | |
---|
| 43 | #include <tables/Tables/Table.h> |
---|
| 44 | #include <tables/Tables/ScalarColumn.h> |
---|
| 45 | #include <tables/Tables/ArrayColumn.h> |
---|
| 46 | #include <tables/Tables/ColumnDesc.h> |
---|
| 47 | #include <tables/Tables/TableRecord.h> |
---|
| 48 | #include <tables/Tables/DataManError.h> |
---|
| 49 | |
---|
| 50 | |
---|
| 51 | using namespace casa; |
---|
| 52 | using namespace asap; |
---|
| 53 | |
---|
| 54 | |
---|
| 55 | |
---|
[427] | 56 | SDStokesEngine::SDStokesEngine (const String& outputColumnName, |
---|
| 57 | const String& inputColumnName) |
---|
| 58 | : BaseMappedArrayEngine<Float,Float> (outputColumnName, inputColumnName) |
---|
[459] | 59 | { |
---|
| 60 | setWritable(False); |
---|
| 61 | } |
---|
[419] | 62 | |
---|
| 63 | |
---|
| 64 | SDStokesEngine::SDStokesEngine (const Record& spec) |
---|
| 65 | : BaseMappedArrayEngine<Float,Float> () |
---|
| 66 | { |
---|
[459] | 67 | setWritable(False); |
---|
[427] | 68 | if (spec.isDefined("OUTPUTNAME") && spec.isDefined("INPUTNAME")) { |
---|
| 69 | setNames (spec.asString("OUTPUTNAME"), spec.asString("INPUTNAME")); |
---|
[419] | 70 | } |
---|
| 71 | } |
---|
| 72 | |
---|
| 73 | SDStokesEngine::SDStokesEngine (const SDStokesEngine& that) |
---|
| 74 | : BaseMappedArrayEngine<Float,Float> (that) |
---|
| 75 | {} |
---|
| 76 | |
---|
| 77 | SDStokesEngine::~SDStokesEngine() |
---|
| 78 | {} |
---|
| 79 | |
---|
| 80 | |
---|
| 81 | DataManager* SDStokesEngine::clone() const |
---|
| 82 | { |
---|
| 83 | DataManager* dmPtr = new SDStokesEngine (*this); |
---|
| 84 | return dmPtr; |
---|
| 85 | } |
---|
| 86 | |
---|
| 87 | |
---|
| 88 | String SDStokesEngine::dataManagerType() const |
---|
| 89 | { |
---|
| 90 | return className(); |
---|
| 91 | } |
---|
| 92 | |
---|
| 93 | String SDStokesEngine::className() |
---|
| 94 | { |
---|
| 95 | return "SDStokesEngine"; |
---|
| 96 | } |
---|
| 97 | |
---|
| 98 | String SDStokesEngine::dataManagerName() const |
---|
| 99 | { |
---|
[459] | 100 | return virtualName(); |
---|
[419] | 101 | } |
---|
| 102 | |
---|
| 103 | Record SDStokesEngine::dataManagerSpec() const |
---|
| 104 | { |
---|
| 105 | Record spec; |
---|
[459] | 106 | spec.define ("OUTPUTNAME", virtualName()); |
---|
| 107 | spec.define ("INPUTNAME", storedName()); |
---|
[419] | 108 | return spec; |
---|
| 109 | } |
---|
| 110 | |
---|
[446] | 111 | DataManager* SDStokesEngine::makeObject (const String&, const Record& spec) |
---|
[419] | 112 | { |
---|
| 113 | DataManager* dmPtr = new SDStokesEngine(spec); |
---|
| 114 | return dmPtr; |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | |
---|
| 118 | void SDStokesEngine::registerClass() |
---|
| 119 | { |
---|
| 120 | DataManager::registerCtor (className(), makeObject); |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | |
---|
| 124 | void SDStokesEngine::create (uInt initialNrrow) |
---|
| 125 | { |
---|
| 126 | BaseMappedArrayEngine<Float,Float>::create (initialNrrow); |
---|
| 127 | } |
---|
| 128 | |
---|
| 129 | void SDStokesEngine::prepare() |
---|
| 130 | { |
---|
| 131 | BaseMappedArrayEngine<Float,Float>::prepare(); |
---|
| 132 | } |
---|
| 133 | |
---|
| 134 | Bool SDStokesEngine::canAccessArrayColumnCells (Bool& reask) const |
---|
| 135 | { |
---|
| 136 | reask = False; |
---|
| 137 | return True; |
---|
| 138 | } |
---|
| 139 | |
---|
| 140 | |
---|
[427] | 141 | void SDStokesEngine::getArray (uInt rownr, Array<Float>& output) |
---|
[419] | 142 | { |
---|
[437] | 143 | Array<Float> input; |
---|
[427] | 144 | roColumn().get(rownr, input); |
---|
[419] | 145 | // |
---|
[427] | 146 | computeOnGet (output, input); |
---|
[419] | 147 | } |
---|
| 148 | |
---|
[427] | 149 | void SDStokesEngine::putArray (uInt rownr, const Array<Float>& input) |
---|
[419] | 150 | { |
---|
| 151 | throw(AipsError("This Virtual Column is not writable")); |
---|
| 152 | } |
---|
| 153 | |
---|
[427] | 154 | |
---|
| 155 | IPosition SDStokesEngine::shape (uInt rownr) |
---|
| 156 | { |
---|
| 157 | IPosition inputShape = roColumn().shape (rownr); |
---|
| 158 | return findOutputShape(inputShape); |
---|
| 159 | } |
---|
| 160 | |
---|
| 161 | |
---|
| 162 | |
---|
| 163 | void SDStokesEngine::computeOnGet(Array<Float>& output, |
---|
| 164 | const Array<Float>& input) |
---|
[419] | 165 | // |
---|
| 166 | // array of shape (nBeam,nIF,nPol,nChan) |
---|
| 167 | // |
---|
[429] | 168 | // We use the scaling convention I=(XX+YY) |
---|
| 169 | // |
---|
[419] | 170 | { |
---|
[427] | 171 | |
---|
| 172 | // Checks |
---|
| 173 | |
---|
| 174 | const uInt nDim = input.ndim(); |
---|
[437] | 175 | AlwaysAssert(nDim==4,AipsError); |
---|
| 176 | AlwaysAssert(output.ndim()==4,AipsError); |
---|
| 177 | // |
---|
[427] | 178 | const IPosition inputShape = input.shape(); |
---|
| 179 | const uInt polAxis = asap::PolAxis; |
---|
| 180 | const uInt nPol = inputShape(polAxis); |
---|
[440] | 181 | AlwaysAssert(nPol==1 || nPol==2 || nPol==4, AipsError); |
---|
[419] | 182 | |
---|
| 183 | // The silly Array slice operator does not give me back |
---|
| 184 | // a const reference so have to caste it away |
---|
| 185 | |
---|
[427] | 186 | Array<Float>& input2 = const_cast<Array<Float>&>(input); |
---|
[419] | 187 | |
---|
[427] | 188 | // Slice coordnates |
---|
| 189 | |
---|
[419] | 190 | IPosition start(nDim,0); |
---|
[427] | 191 | IPosition end(input.shape()-1); |
---|
[419] | 192 | |
---|
[427] | 193 | // Generate Slices |
---|
[419] | 194 | |
---|
| 195 | start(polAxis) = 0; |
---|
| 196 | end(polAxis) = 0; |
---|
[427] | 197 | Array<Float> C1 = input2(start,end); // Input : C1 |
---|
[419] | 198 | // |
---|
[427] | 199 | start(polAxis) = 0; |
---|
| 200 | end(polAxis) = 0; |
---|
| 201 | Array<Float> I = output(start,end); // Output : I |
---|
| 202 | // |
---|
| 203 | if (nPol==1) { |
---|
[429] | 204 | I = Float(2.0)*C1; |
---|
[427] | 205 | return; |
---|
| 206 | } |
---|
| 207 | // |
---|
[419] | 208 | start(polAxis) = 1; |
---|
| 209 | end(polAxis) = 1; |
---|
[427] | 210 | Array<Float> C2 = input2(start,end); // Input : C1 |
---|
[419] | 211 | // |
---|
[429] | 212 | I = C1 + C2; |
---|
[427] | 213 | if (nPol <= 2) return; |
---|
| 214 | // |
---|
[419] | 215 | start(polAxis) = 2; |
---|
| 216 | end(polAxis) = 2; |
---|
[427] | 217 | Array<Float> C3 = input2(start,end); // Input : C3 |
---|
[419] | 218 | // |
---|
| 219 | start(polAxis) = 3; |
---|
| 220 | end(polAxis) = 3; |
---|
[427] | 221 | Array<Float> C4 = input2(start,end); // Input : C4 |
---|
[419] | 222 | // |
---|
| 223 | start(polAxis) = 1; |
---|
| 224 | end(polAxis) = 1; |
---|
[427] | 225 | Array<Float> Q = output(start,end); // Output : Q |
---|
[429] | 226 | Q = C1 - C2; |
---|
[419] | 227 | // |
---|
| 228 | start(polAxis) = 2; |
---|
| 229 | end(polAxis) = 2; |
---|
[427] | 230 | Array<Float> U = output(start,end); // Output : U |
---|
[429] | 231 | U = Float(2.0)*C3; |
---|
[419] | 232 | // |
---|
| 233 | start(polAxis) = 3; |
---|
| 234 | end(polAxis) = 3; |
---|
[427] | 235 | Array<Float> V = output(start,end); // Output : V |
---|
[429] | 236 | V = Float(2.0)*C4; |
---|
[419] | 237 | } |
---|
| 238 | |
---|
| 239 | |
---|
| 240 | |
---|
[427] | 241 | IPosition SDStokesEngine::findOutputShape (const IPosition& inputShape) const |
---|
| 242 | { |
---|
| 243 | uInt axis = 2; |
---|
| 244 | uInt nPol = inputShape(axis); |
---|
| 245 | IPosition outputShape = inputShape; |
---|
| 246 | if (nPol==1) { |
---|
| 247 | outputShape(axis) = 1; // XX -> I |
---|
| 248 | } else if (nPol==2) { |
---|
| 249 | outputShape(axis) = 1; // XX YY -> I |
---|
| 250 | } else if (nPol==4) { |
---|
| 251 | outputShape(axis) = 4; // XX YY R(XY) I(XY) -> I Q U V |
---|
| 252 | } |
---|
| 253 | return outputShape; |
---|
| 254 | } |
---|
| 255 | |
---|
| 256 | |
---|
| 257 | |
---|
[419] | 258 | // SDPolUtil |
---|
| 259 | |
---|
| 260 | Array<Float> SDPolUtil::polarizedIntensity (const Array<Float>& Q, |
---|
| 261 | const Array<Float>& U) |
---|
| 262 | { |
---|
| 263 | Array<Float> t1 = pow(Q,Double(2.0)); |
---|
| 264 | Array<Float> t2 = pow(U,Double(2.0)); |
---|
| 265 | return sqrt(t1+t2); |
---|
| 266 | } |
---|
| 267 | |
---|
| 268 | |
---|
| 269 | Array<Float> SDPolUtil::positionAngle (const Array<Float>& Q, |
---|
| 270 | const Array<Float>& U) |
---|
| 271 | { |
---|
[426] | 272 | return Float(180.0/C::pi/2.0)*atan2(Q,U); // Degrees |
---|
[419] | 273 | } |
---|
| 274 | |
---|
| 275 | |
---|
| 276 | void SDPolUtil::rotateXYPhase (Array<Float>& C3, |
---|
| 277 | Array<Float>& C4, |
---|
| 278 | Float phase) |
---|
| 279 | { |
---|
| 280 | Float cosVal = cos(C::pi/180.0*phase); |
---|
| 281 | Float sinVal = sin(C::pi/180.0*phase); |
---|
| 282 | // |
---|
| 283 | C3 = C3*cosVal - C4*sinVal; |
---|
| 284 | C4 = C3*sinVal + C4*cosVal; |
---|
| 285 | } |
---|
| 286 | |
---|
| 287 | |
---|
[429] | 288 | |
---|
| 289 | Array<Float> SDPolUtil::getStokesSlice (Array<Float>& in, const IPosition& start, |
---|
| 290 | const IPosition& end, const String& stokes) |
---|
| 291 | { |
---|
| 292 | IPosition s(start); |
---|
| 293 | IPosition e(end); |
---|
| 294 | // |
---|
| 295 | if (stokes=="I") { |
---|
| 296 | s(asap::PolAxis) = 0; |
---|
| 297 | e(asap::PolAxis) = 0; |
---|
| 298 | } else if (stokes=="Q") { |
---|
| 299 | s(asap::PolAxis) = 1; |
---|
| 300 | e(asap::PolAxis) = 1; |
---|
| 301 | } else if (stokes=="U") { |
---|
| 302 | s(asap::PolAxis) = 2; |
---|
| 303 | e(asap::PolAxis) = 2; |
---|
| 304 | } else if (stokes=="V") { |
---|
| 305 | s(asap::PolAxis) = 3; |
---|
| 306 | e(asap::PolAxis) = 3; |
---|
| 307 | } |
---|
| 308 | // |
---|
| 309 | return in(s,e); |
---|
| 310 | } |
---|
[419] | 311 | |
---|
[429] | 312 | |
---|
| 313 | Array<Float> SDPolUtil::circularPolarizationFromStokes (Array<Float>& I, |
---|
| 314 | Array<Float>& V, |
---|
| 315 | Bool doRR) |
---|
| 316 | { |
---|
| 317 | if (doRR) { |
---|
| 318 | return Float(0.5)*(I+V); |
---|
| 319 | } else { |
---|
| 320 | return Float(0.5)*(I-V); |
---|
| 321 | } |
---|
| 322 | } |
---|
| 323 | |
---|
[446] | 324 | Stokes::StokesTypes SDPolUtil::convertStokes(Int val, Bool toStokes, Bool linear) |
---|
| 325 | { |
---|
| 326 | Stokes::StokesTypes stokes = Stokes::Undefined; |
---|
| 327 | if (toStokes) { |
---|
| 328 | if (val==0) { |
---|
| 329 | stokes = Stokes::I; |
---|
| 330 | } else if (val==1) { |
---|
| 331 | stokes = Stokes::Q; |
---|
| 332 | } else if (val==2) { |
---|
| 333 | stokes = Stokes::U; |
---|
| 334 | } else if (val==3) { |
---|
| 335 | stokes = Stokes::V; |
---|
| 336 | } |
---|
| 337 | } else if (linear) { |
---|
| 338 | if (val==0) { |
---|
| 339 | stokes = Stokes::XX; |
---|
| 340 | } else if (val==1) { |
---|
| 341 | stokes = Stokes::YY; |
---|
| 342 | } else if (val==2) { |
---|
| 343 | stokes = Stokes::XY; // Real(XY) |
---|
| 344 | } else if (val==3) { |
---|
| 345 | stokes = Stokes::XY; // Imag(XY) |
---|
| 346 | } |
---|
| 347 | } else { |
---|
| 348 | if (val==0) { |
---|
| 349 | stokes = Stokes::RR; |
---|
| 350 | } else if (val==1) { |
---|
| 351 | stokes = Stokes::LL; |
---|
| 352 | } else if (val==2) { |
---|
| 353 | stokes = Stokes::RL; |
---|
| 354 | } else if (val==3) { |
---|
| 355 | stokes = Stokes::RL; |
---|
| 356 | } |
---|
| 357 | } |
---|
| 358 | // |
---|
| 359 | return stokes; |
---|
| 360 | } |
---|