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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33 | |
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34 | #include <casa/Arrays/Array.h> |
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35 | #include <casa/Arrays/ArrayMath.h> |
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36 | #include <casa/Containers/Record.h> |
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37 | #include <casa/BasicSL/Constants.h> |
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38 | #include <casa/BasicSL/String.h> |
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39 | #include <casa/Utilities/Assert.h> |
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40 | |
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41 | #include <tables/Tables/Table.h> |
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42 | #include <tables/Tables/ScalarColumn.h> |
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43 | #include <tables/Tables/ArrayColumn.h> |
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44 | #include <tables/Tables/ColumnDesc.h> |
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45 | #include <tables/Tables/TableRecord.h> |
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46 | #include <tables/Tables/DataManError.h> |
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47 | |
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48 | |
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49 | using namespace casa; |
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50 | using namespace asap; |
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51 | |
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52 | |
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53 | |
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54 | SDStokesEngine::SDStokesEngine (const String& sourceColumnName, |
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55 | const String& targetColumnName) |
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56 | |
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57 | : BaseMappedArrayEngine<Float,Float> (sourceColumnName, targetColumnName) |
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58 | {} |
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59 | |
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60 | |
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61 | SDStokesEngine::SDStokesEngine (const Record& spec) |
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62 | : BaseMappedArrayEngine<Float,Float> () |
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63 | { |
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64 | if (spec.isDefined("SOURCENAME") && spec.isDefined("TARGETNAME")) { |
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65 | setNames (spec.asString("SOURCENAME"), spec.asString("TARGETNAME")); |
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66 | } |
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67 | } |
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68 | |
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69 | SDStokesEngine::SDStokesEngine (const SDStokesEngine& that) |
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70 | : BaseMappedArrayEngine<Float,Float> (that) |
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71 | {} |
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72 | |
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73 | SDStokesEngine::~SDStokesEngine() |
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74 | {} |
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75 | |
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76 | |
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77 | DataManager* SDStokesEngine::clone() const |
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78 | { |
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79 | DataManager* dmPtr = new SDStokesEngine (*this); |
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80 | return dmPtr; |
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81 | } |
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82 | |
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83 | |
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84 | String SDStokesEngine::dataManagerType() const |
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85 | { |
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86 | return className(); |
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87 | } |
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88 | |
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89 | String SDStokesEngine::className() |
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90 | { |
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91 | return "SDStokesEngine"; |
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92 | } |
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93 | |
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94 | String SDStokesEngine::dataManagerName() const |
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95 | { |
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96 | return sourceName(); |
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97 | } |
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98 | |
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99 | Record SDStokesEngine::dataManagerSpec() const |
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100 | { |
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101 | Record spec; |
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102 | spec.define ("SOURCENAME", sourceName()); |
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103 | spec.define ("TARGETNAME", targetName()); |
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104 | return spec; |
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105 | } |
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106 | |
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107 | DataManager* SDStokesEngine::makeObject (const String&, |
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108 | const Record& spec) |
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109 | { |
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110 | DataManager* dmPtr = new SDStokesEngine(spec); |
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111 | return dmPtr; |
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112 | } |
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113 | |
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114 | |
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115 | void SDStokesEngine::registerClass() |
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116 | { |
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117 | DataManager::registerCtor (className(), makeObject); |
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118 | } |
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119 | |
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120 | |
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121 | void SDStokesEngine::create (uInt initialNrrow) |
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122 | { |
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123 | BaseMappedArrayEngine<Float,Float>::create (initialNrrow); |
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124 | } |
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125 | |
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126 | void SDStokesEngine::prepare() |
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127 | { |
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128 | BaseMappedArrayEngine<Float,Float>::prepare(); |
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129 | } |
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130 | |
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131 | Bool SDStokesEngine::canAccessArrayColumnCells (Bool& reask) const |
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132 | { |
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133 | reask = False; |
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134 | return True; |
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135 | } |
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136 | |
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137 | |
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138 | void SDStokesEngine::getArray (uInt rownr, Array<Float>& array) |
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139 | { |
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140 | Array<Float> target(array.shape()); |
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141 | roColumn().get(rownr, target); |
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142 | // |
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143 | computeOnGet (array, target); |
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144 | } |
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145 | |
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146 | void SDStokesEngine::putArray (uInt rownr, const Array<Float>& array) |
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147 | { |
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148 | throw(AipsError("This Virtual Column is not writable")); |
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149 | } |
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150 | |
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151 | |
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152 | |
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153 | void SDStokesEngine::computeOnGet(Array<Float>& array, |
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154 | const Array<Float>& target) |
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155 | // |
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156 | // array of shape (nBeam,nIF,nPol,nChan) |
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157 | // |
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158 | { |
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159 | DebugAssert(target.ndim()==4,AipsError); |
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160 | DebugAssert(array.ndim()==4,AipsError); |
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161 | |
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162 | // The silly Array slice operator does not give me back |
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163 | // a const reference so have to caste it away |
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164 | |
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165 | Array<Float>& target2 = const_cast<Array<Float>&>(target); |
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166 | |
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167 | // uInt polAxis = asap::PolAxis; |
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168 | uInt polAxis = 2; |
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169 | // |
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170 | const uInt nDim = target.ndim(); |
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171 | IPosition start(nDim,0); |
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172 | IPosition end(target.shape()-1); |
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173 | |
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174 | // Input slices |
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175 | |
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176 | start(polAxis) = 0; |
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177 | end(polAxis) = 0; |
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178 | Array<Float> C1 = target2(start,end); |
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179 | // |
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180 | start(polAxis) = 1; |
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181 | end(polAxis) = 1; |
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182 | Array<Float> C2 = target2(start,end); |
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183 | // |
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184 | start(polAxis) = 2; |
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185 | end(polAxis) = 2; |
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186 | Array<Float> C3 = target2(start,end); |
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187 | // |
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188 | start(polAxis) = 3; |
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189 | end(polAxis) = 3; |
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190 | Array<Float> C4 = target2(start,end); |
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191 | |
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192 | // Compute Output slices |
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193 | |
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194 | start(polAxis) = 0; |
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195 | end(polAxis) = 0; |
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196 | Array<Float> I = array(start,end); |
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197 | I = Float(0.5)*(C1 + C2); |
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198 | // |
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199 | start(polAxis) = 1; |
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200 | end(polAxis) = 1; |
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201 | Array<Float> Q = array(start,end); |
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202 | Q = Float(0.5)*(C1 - C2); |
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203 | // |
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204 | start(polAxis) = 2; |
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205 | end(polAxis) = 2; |
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206 | Array<Float> U = array(start,end); |
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207 | U = C3; |
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208 | // |
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209 | start(polAxis) = 3; |
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210 | end(polAxis) = 3; |
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211 | Array<Float> V = array(start,end); |
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212 | V = C4; |
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213 | } |
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214 | |
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215 | |
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216 | |
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217 | |
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218 | // SDPolUtil |
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219 | |
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220 | Array<Float> SDPolUtil::polarizedIntensity (const Array<Float>& Q, |
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221 | const Array<Float>& U) |
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222 | { |
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223 | Array<Float> t1 = pow(Q,Double(2.0)); |
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224 | Array<Float> t2 = pow(U,Double(2.0)); |
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225 | return sqrt(t1+t2); |
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226 | } |
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227 | |
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228 | |
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229 | Array<Float> SDPolUtil::positionAngle (const Array<Float>& Q, |
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230 | const Array<Float>& U) |
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231 | { |
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232 | return Float(180.0/C::pi/2.0)*atan2(Q,U); |
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233 | } |
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234 | |
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235 | |
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236 | void SDPolUtil::rotateXYPhase (Array<Float>& C3, |
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237 | Array<Float>& C4, |
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238 | Float phase) |
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239 | { |
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240 | Float cosVal = cos(C::pi/180.0*phase); |
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241 | Float sinVal = sin(C::pi/180.0*phase); |
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242 | // |
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243 | C3 = C3*cosVal - C4*sinVal; |
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244 | C4 = C3*sinVal + C4*cosVal; |
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245 | } |
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246 | |
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247 | |
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248 | |
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