| 1 | //#---------------------------------------------------------------------------
|
|---|
| 2 | //# SDPol.h: Polarimetric processing
|
|---|
| 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 | #ifndef SDPOL_H
|
|---|
| 32 | #define SDPOL_H
|
|---|
| 33 |
|
|---|
| 34 | //# Includes
|
|---|
| 35 | #include <casa/aips.h>
|
|---|
| 36 | #include <casa/Arrays/Array.h>
|
|---|
| 37 | #include <casa/Arrays/ArrayMath.h>
|
|---|
| 38 | #include <casa/Arrays/ArrayLogical.h>
|
|---|
| 39 | #include <measures/Measures/Stokes.h>
|
|---|
| 40 | #include <tables/Tables/BaseMappedArrayEngine.h>
|
|---|
| 41 |
|
|---|
| 42 |
|
|---|
| 43 | namespace asap {
|
|---|
| 44 |
|
|---|
| 45 | class SDStokesEngine : public casa::BaseMappedArrayEngine<casa::Float, casa::Float>
|
|---|
| 46 | {
|
|---|
| 47 | //# Make members of parent class known.
|
|---|
| 48 | public:
|
|---|
| 49 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::virtualName;
|
|---|
| 50 | protected:
|
|---|
| 51 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::storedName;
|
|---|
| 52 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::table;
|
|---|
| 53 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::roColumn;
|
|---|
| 54 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::rwColumn;
|
|---|
| 55 |
|
|---|
| 56 | public:
|
|---|
| 57 | // Construct engine. The sourveColumnName holds the XX,YY,R(XY),I(XY)
|
|---|
| 58 | // correlations
|
|---|
| 59 | SDStokesEngine (const casa::String& virtualColumnName,
|
|---|
| 60 | const casa::String& sourceColumnName);
|
|---|
| 61 |
|
|---|
| 62 | // Construct from a record specification as created by getmanagerSpec().
|
|---|
| 63 | SDStokesEngine (const casa::Record& spec);
|
|---|
| 64 |
|
|---|
| 65 | // Destructor is mandatory.
|
|---|
| 66 | ~SDStokesEngine();
|
|---|
| 67 |
|
|---|
| 68 | // Return the type name of the engine (i.e. its class name).
|
|---|
| 69 | virtual casa::String dataManagerType() const;
|
|---|
| 70 |
|
|---|
| 71 | // Get the name given to the engine (is the source column name).
|
|---|
| 72 | virtual casa::String dataManagerName() const;
|
|---|
| 73 |
|
|---|
| 74 | // casa::Record a casa::Record containing data manager specifications.
|
|---|
| 75 | virtual casa::Record dataManagerSpec() const;
|
|---|
| 76 |
|
|---|
| 77 | // Return the name of the class.
|
|---|
| 78 | // This includes the names of the template arguments.
|
|---|
| 79 | static casa::String className();
|
|---|
| 80 |
|
|---|
| 81 | // The engine can access column cells.
|
|---|
| 82 | virtual casa::Bool canAccessArrayColumnCells (casa::Bool& reask) const;
|
|---|
| 83 |
|
|---|
| 84 | // Register the class name and the static makeObject "constructor".
|
|---|
| 85 | // This will make the engine known to the table system.
|
|---|
| 86 | // The automatically invoked registration function in DataManReg.cc
|
|---|
| 87 | // contains SDStokesEngine
|
|---|
| 88 | // Any other instantiation of this class must be registered "manually"
|
|---|
| 89 | // (or added to DataManReg.cc).
|
|---|
| 90 | static void registerClass();
|
|---|
| 91 |
|
|---|
| 92 | // Non writable
|
|---|
| 93 | // virtual casa::Bool isWritable () const {return casa::False;}
|
|---|
| 94 |
|
|---|
| 95 | private:
|
|---|
| 96 | // Copy constructor is only used by clone().
|
|---|
| 97 | // (so it is made private).
|
|---|
| 98 | SDStokesEngine (const SDStokesEngine&);
|
|---|
| 99 |
|
|---|
| 100 | // Assignment is not needed and therefore forbidden
|
|---|
| 101 | // (so it is made private and not implemented).
|
|---|
| 102 | SDStokesEngine& operator=(const SDStokesEngine&);
|
|---|
| 103 |
|
|---|
| 104 | // Clone the engine object.
|
|---|
| 105 | DataManager* clone() const;
|
|---|
| 106 |
|
|---|
| 107 | // Initialize the object for a new table.
|
|---|
| 108 | // It defines the keywords containing the engine parameters.
|
|---|
| 109 | void create (casa::uInt initialNrrow);
|
|---|
| 110 |
|
|---|
| 111 | // Preparing consists of setting the writable switch and
|
|---|
| 112 | // adding the initial number of rows in case of create.
|
|---|
| 113 | // Furthermore it reads the keywords containing the engine parameters.
|
|---|
| 114 | void prepare();
|
|---|
| 115 |
|
|---|
| 116 | // Get an array in the given row.
|
|---|
| 117 | void getArray (casa::uInt rownr, casa::Array<casa::Float>& array);
|
|---|
| 118 |
|
|---|
| 119 | // Exception
|
|---|
| 120 | void putArray (casa::uInt rownr, const casa::Array<casa::Float>& array);
|
|---|
| 121 |
|
|---|
| 122 | // Compute Stokes parameters
|
|---|
| 123 | void computeOnGet (casa::Array<casa::Float>& array,
|
|---|
| 124 | const casa::Array<casa::Float>& target);
|
|---|
| 125 |
|
|---|
| 126 | // Get shape
|
|---|
| 127 | virtual casa::IPosition shape (casa::uInt rownr);
|
|---|
| 128 |
|
|---|
| 129 | // Convert input to output (virtual) shape
|
|---|
| 130 | casa::IPosition findOutputShape (const casa::IPosition& inputShape) const;
|
|---|
| 131 |
|
|---|
| 132 |
|
|---|
| 133 | public:
|
|---|
| 134 | //*display 4
|
|---|
| 135 | // Define the "constructor" to construct this engine when a
|
|---|
| 136 | // table is read back.
|
|---|
| 137 | // This "constructor" has to be registered by the user of the engine.
|
|---|
| 138 | // If the engine is commonly used, its registration can be added
|
|---|
| 139 | // to the registerAllCtor function in DataManReg.cc.
|
|---|
| 140 | // That function gets automatically invoked by the table system.
|
|---|
| 141 | static DataManager* makeObject (const casa::String& dataManagerType,
|
|---|
| 142 | const casa::Record& spec);
|
|---|
| 143 | };
|
|---|
| 144 |
|
|---|
| 145 |
|
|---|
| 146 |
|
|---|
| 147 | class SDPolUtil
|
|---|
| 148 | {
|
|---|
| 149 | public:
|
|---|
| 150 | // Convert Q and U to linearly polarized intensity
|
|---|
| 151 | static casa::Array<casa::Float> polarizedIntensity (const casa::Array<casa::Float>& Q,
|
|---|
| 152 | const casa::Array<casa::Float>& U);
|
|---|
| 153 | // Convert Q and U to linearly polarized position angle (degrees)
|
|---|
| 154 | static casa::Array<casa::Float> positionAngle (const casa::Array<casa::Float>& Q,
|
|---|
| 155 | const casa::Array<casa::Float>& U);
|
|---|
| 156 |
|
|---|
| 157 | // Rotate phase of Complex correlation C3+iC4 by phase (degrees)
|
|---|
| 158 | static void rotateXYPhase (casa::Array<casa::Float>& C3,
|
|---|
| 159 | casa::Array<casa::Float>& C4,
|
|---|
| 160 | casa::Float phase);
|
|---|
| 161 |
|
|---|
| 162 | // Get Stokes slices from the Array. Start and End should
|
|---|
| 163 | // already be setup to access the Array at the current cursor location
|
|---|
| 164 | // (beam, IF, Pol; see SDMemTable). The desired Stokes
|
|---|
| 165 | // is specfied in the string from "I", "Q", "U", "V"
|
|---|
| 166 | static casa::Array<casa::Float> getStokesSlice (casa::Array<casa::Float>& input, const casa::IPosition& start,
|
|---|
| 167 | const casa::IPosition& end, const casa::String& stokes);
|
|---|
| 168 |
|
|---|
| 169 | // Compute Circular polarization RR or LL from I and V
|
|---|
| 170 | static casa::Array<casa::Float> circularPolarizationFromStokes (casa::Array<casa::Float>& I,
|
|---|
| 171 | casa::Array<casa::Float>& V,
|
|---|
| 172 | casa::Bool doRR);
|
|---|
| 173 |
|
|---|
| 174 |
|
|---|
| 175 | // Compute value for STokes parameters by combining the raw correlation values
|
|---|
| 176 | // The output shape may change from the input shape according to
|
|---|
| 177 | // XX or YY -> I
|
|---|
| 178 | // XX,YY -> I
|
|---|
| 179 | // XX,YY,R(XY),I(XY) -> I,Q,U,V
|
|---|
| 180 | // Bool for mask
|
|---|
| 181 | // Float for TSys
|
|---|
| 182 | template <class T>
|
|---|
| 183 | static casa::Array<T> stokesData (casa::Array<T>& rawData, casa::Bool doLinear);
|
|---|
| 184 |
|
|---|
| 185 |
|
|---|
| 186 | // Find the Stokes type for the given polarization axis (0,1,2,3)
|
|---|
| 187 | // You can ask for STokes or raw correltions (linear or circular)
|
|---|
| 188 | static casa::Stokes::StokesTypes convertStokes(casa::Int val, casa::Bool toStokes,
|
|---|
| 189 | casa::Bool linear);
|
|---|
| 190 |
|
|---|
| 191 | private:
|
|---|
| 192 | static casa::Array<casa::Float> andArrays (const casa::Array<casa::Float>& in1,
|
|---|
| 193 | const casa::Array<casa::Float>& in2)
|
|---|
| 194 | {return (in1+in2)/casa::Float(2.0);}
|
|---|
| 195 |
|
|---|
| 196 | static casa::Array<casa::Bool> andArrays (const casa::Array<casa::Bool>& in1,
|
|---|
| 197 | const casa::Array<casa::Bool>& in2)
|
|---|
| 198 | {return in1&&in2;}
|
|---|
| 199 | };
|
|---|
| 200 |
|
|---|
| 201 |
|
|---|
| 202 |
|
|---|
| 203 |
|
|---|
| 204 |
|
|---|
| 205 | } // namespace
|
|---|
| 206 |
|
|---|
| 207 | #endif
|
|---|
