A Measure: wave characteristics. More...

#include <MFrequency.h>

Inheritance diagram for casacore::MFrequency:

Public Types
enum	Types { REST, LSRK, LSRD, BARY, GEO, TOPO, GALACTO, LGROUP, CMB, N_Types, Undefined, N_Other, EXTRA, DEFAULT, LSR }
	Types of known MFrequencies Warning: The order defines the order in the translation matrix FromTo in the getConvert routine; Do not change the order without changing the array; Additions should be made before N_types, and an additional row and column should be coded in FromTo, and in showType(); More...

typedef MVFrequency	MVType
	Measure value container for this class (i.e. More...

typedef MCFrequency	MCType
	Measure conversion routines for this class (i.e. More...

typedef MeasRef< MFrequency >	Ref
	Measure reference (i.e. More...

typedef MeasConvert< MFrequency >	Convert
	Measure conversion use (i.e. More...

typedef ScalarMeasColumn < MFrequency >	ScalarColumn
	Measure table Columns (e.g., MFrequency::ScalarColumn) More...

typedef ArrayMeasColumn < MFrequency >	ArrayColumn

Public Types inherited from casacore::Measure
enum	Types { N_Types, DEFAULT }
	Each derived class should have a `Types` enumeration, specifying the recognised frame types. More...

typedef void *	Convert
	Each Measure should have typedefs of the form: More...

Public Member Functions
	MFrequency ()
	Tip: In the following constructors and other functions, all MeasRef* can be replaced with simple `Measure::TYPE` where no offsets or frames are needed in the reference;* Default constructor; generates a zero rest frequency More...

	MFrequency (const MVFrequency &dt)
	Create from data and reference. More...

	MFrequency (const MVFrequency &dt, const MFrequency::Ref &rf)

	MFrequency (const MVFrequency &dt, MFrequency::Types rf)

	MFrequency (const Quantity &dt)

	MFrequency (const Quantity &dt, const MFrequency::Ref &rf)

	MFrequency (const Quantity &dt, MFrequency::Types rf)

	MFrequency (const Measure *dt)

	MFrequency (const MeasValue *dt)

virtual	~MFrequency ()

virtual const String &	tellMe () const
	Tell me your type. More...

virtual uInt	type () const
	Get the type (== Register() of derived Measure (faster than Strings) All should have: static uInt myType();. More...

Bool	giveMe (MFrequency::Ref &mr, const String &in)

virtual Bool	setOffset (const Measure &in)
	Set the offset in the reference (False if non-matching Measure) More...

virtual Bool	setRefString (const String &in)
	Set the reference type to the specified String. More...

virtual const String &	getDefaultType () const
	Get the default reference type. More...

virtual const String *	allTypes (Int &nall, Int &nextra, const uInt *&typ) const
	Get a list of all known reference codes. More...

virtual void	checkTypes () const
	Check if all internal tables of types (both enum and String) are complete and correct. More...

virtual String	getRefString () const
	Get the reference type (for records, including codes like R_) More...

Quantity	get (const Unit &un) const
	Get frequency in specified units. More...

MDoppler	toDoppler (const MVFrequency &rest)
	Make a Doppler velocity from the frequency and the specified rest frequency. More...

MDoppler	toDoppler (const MVFrequency &rest) const

MFrequency	toRest (const MDoppler &dop) const
	Make a rest frequency using a Doppler velocity. More...

virtual Measure *	clone () const
	Make a copy. More...

Public Member Functions inherited from casacore::MeasBase< MVFrequency, MeasRef< MFrequency > >
	MeasBase ()
	Tip: In the following constructors and other functions, all MeasRef can be replaced with simple `Measure::TYPE` where no offsets or frames are needed in the reference; For reasons of compiler limitations the formal arguments had to be specified as uInt rather than the Measure enums that should be used as actual arguments; Default constructor More...

	MeasBase (const MeasBase< MVFrequency, MeasRef< MFrequency > > &other)
	Copy constructor. More...

	MeasBase (const MVFrequency &dt, const MeasRef< MFrequency > &rf)
	Create from data and reference. More...

	MeasBase (const MVFrequency &dt, uInt rf)

	MeasBase (const Quantity &dt, const MeasRef< MFrequency > &rf)

	MeasBase (const Quantity &dt, uInt rf)

	MeasBase (const Measure *dt)

	MeasBase (const MeasRef< MFrequency > &rf)

	MeasBase (const uInt rf)

MeasBase< MVFrequency, MeasRef < MFrequency > > &	operator= (const MeasBase< MVFrequency, MeasRef< MFrequency > > &other)
	Copy assignment. More...

virtual	~MeasBase ()

virtual Bool	areYou (const String &tp) const
	Check the type of derived entity. More...

virtual void	assured (const String &tp) const
	Assert that we are the correct type. More...

void	set (const MVFrequency &dt)
	Refill the specified entities. More...

void	set (const MeasRef< MFrequency > &rf)

void	set (const MVFrequency &dt, const MeasRef< MFrequency > &rf)

void	set (const Unit &inunit)

virtual void	set (const MeasValue &dt)
	Each Measure should have the following set functions (with appropiate MVs and Ref): More...

virtual Bool	putValue (const Vector< Quantum< Double > > &in)

MeasRef< MFrequency >	getRef () const
	Get reference. More...

const MVFrequency &	getValue () const
	Get Measure data. More...

const Unit &	getUnit () const
	Get Unit. More...

virtual MRBase *	getRefPtr () const
	Get reference pointer. More...

virtual const MeasValue *	getData () const
	Get pointer to data. More...

virtual void	print (std::ostream &os) const
	Print a Measure. More...

Public Member Functions inherited from casacore::Measure
virtual	~Measure ()
	Destructor. More...

virtual Bool	isModel () const
	Tell me if you are a pure model (e.g. More...

void	dummy_giveMe () const
	Each derived class should have a string-to-code translation routine for the reference type. More...

void	dummy_getRef () const
	Each class should have a function to return its reference: More...

void	dummy_getValue () const
	Each derived class should be able to get its internal value and have: More...

Static Public Member Functions
static const String &	showMe ()

static void	assure (const Measure &in)

static MFrequency::Types	castType (uInt tp)
	Translate reference code. More...

static const String &	showType (MFrequency::Types tp)

static const String &	showType (uInt tp)

static Bool	getType (MFrequency::Types &tp, const String &in)
	Translate string to reference code. More...

static MFrequency::Types	typeFromString (const String &in)
	Throws an exception if the type string is not recognized. More...

static const String *	allMyTypes (Int &nall, Int &nextra, const uInt *&typ)

static void	checkMyTypes ()

static uInt	myType ()
	Get my type (as Register) More...

static MDoppler	toDoppler (const Measure &in, const MVFrequency &rest)
	Local use only. More...

static MFrequency	fromDoppler (const MDoppler &dop, const MVFrequency &rest)
	Make a frequency from the Doppler velocity and the specified rest frequency (default reference type LSRK) More...

static MFrequency	fromDoppler (const MDoppler &dop, const MVFrequency &rest, MFrequency::Types type)

static MFrequency	fromDoppler (const Measure &dop, const MVFrequency &rest, MFrequency::Types type)
	For internal use only. More...

static MFrequency	toRest (const Measure &in, const Measure &dop)
	For local use only. More...

Static Public Member Functions inherited from casacore::Measure
static uInt	giveMe (const String &in, Int N_name, const String tname[])
	A general string checking routine to be used in derived measures. More...

Friends
class	MeasConvert< MFrequency >
	Conversion of data. More...

Additional Inherited Members
Protected Attributes inherited from casacore::MeasBase< MVFrequency, MeasRef< MFrequency > >
MVFrequency	data
	The measure value (e.g. More...

MeasRef< MFrequency >	ref
	Reference frame data. More...

Unit	unit
	Possible input units. More...

Detailed Description

A Measure: wave characteristics.

Intended use:

Public interface

Review Status

Reviewed By:: UNKNOWN
Date Reviewed:: before2004/08/25
Test programs:: tMeasure

Prerequisite

Measure class
MRadialVelocity class for some other background.

Etymology

Synopsis

MFrequency is a derived Measure class for wave characteristics.
An MFrequency can be generated from a simple value (or an MFrequency object), which is then interpreted as a frequency in Hz, and a reference, with an LSRK type as default.
It can also be generated from a Quantity, where the interpretation depends on the dimensionality of the Quantity:

time (e.g. s): period
frequency (e.g. Hz): frequency
angular frequency (e.g. arcmin/s): angular frequency
length (e.g. cm): wavelength
inverse length (e.g. mm^-1): wave number
energy (e.g. J.s): energy (i.e. h.nu)
momentum (e.g. kg.m): m.c/h

The different reference types of a frequency are:

MFrequency::REST – Rest frequency
MFrequency::LSRD – Local Standard of Rest (J2000) – as the dynamical definition (IAU, [9,12,7] km/s in galactic coordinates)
MFrequency::LSRK – LSR as a kinematical (radio) definition – 20.0 km/s in direction ra,dec = [270,+30] deg (B1900.0)
MFrequency::BARY – Barycentric (J2000)
MFrequency::GEO — Geocentric
MFrequency::TOPO – Topocentric
MFrequency::GALACTO – Galacto centric (with rotation of 220 km/s in direction l,b = [90,0] deg.
MFrequency::LGROUP – Local group velocity – 308km/s towards l,b = [105,-7] deg (F. Ghigo)
MFrequency::CMB – CMB velocity – 369.5km/s towards l,b = [264.4, 48.4] deg (F. Ghigo)
MFrequency::DEFAULT = LSRK

Conversion between the different types is done with the standard MeasConvert class (MFrequency::Convert in this case). Some of the conversions are only possible if frame information has been filled in. The following frame information is necessary if a conversion goes to or from the (different) specified types:

Radial Velocity: REST
Epoch: TOPO, GEO
Position: TOPO
Direction all

To accommodate unknown or invalid frames, the additional reference type

MFrequency::Undefined

is available. Conversions to/from Undefined are not possible. If attempted, an exception will be thrown. The name was chosen to be Undefined and not UNDEFINED in order to not collide with the (ugly) WCSLIB macro of the upper case name and in concordance with Stokes::Undefined.
An MFrequency can be created from an MDoppler (and a rest frequency, (the QC class contains at least QC::HI)) by the fromDoppler() member. It can be converted to an MDoppler with the toDoppler(). Comparable methods will be available for MFrequency as toRadial() and fromRadial.
If the Doppler shift is known (e.g. from another spectral line), the REST frequency can be determined with the toREST() member.
Caution: Conversion between the different frequencies can, due to relativistic effects, only be done approximately for very high (order c) radial velocities (shifted frequencies); A better approach would be to start from radial velocities and a rest frequency;

Example

Get the Doppler shift for an oberved HI frequency of 1380 MHz

cout << "Redshift for 1380 MHz: " <<
MDoppler::Convert(MFrequency(Quantity(1380., "MHz"),
MFrequency::TOPO).toDoppler(QC::HI),
MDoppler::Z)() << endl;

Motivation

Definition at line 161 of file MFrequency.h.

Member Typedef Documentation

typedef ArrayMeasColumn<MFrequency> casacore::MFrequency::ArrayColumn

Definition at line 207 of file MFrequency.h.

typedef MeasConvert<MFrequency> casacore::MFrequency::Convert

Measure conversion use (i.e.

MFrequency::Convert)

Definition at line 204 of file MFrequency.h.

typedef MCFrequency casacore::MFrequency::MCType

Measure conversion routines for this class (i.e.

MFrequency::MCType)

Definition at line 200 of file MFrequency.h.

typedef MVFrequency casacore::MFrequency::MVType

Measure value container for this class (i.e.

MFrequency::MVType)

Definition at line 198 of file MFrequency.h.

typedef MeasRef<MFrequency> casacore::MFrequency::Ref

Measure reference (i.e.

MFrequency::Ref)

Definition at line 202 of file MFrequency.h.

typedef ScalarMeasColumn<MFrequency> casacore::MFrequency::ScalarColumn

Measure table Columns (e.g., MFrequency::ScalarColumn)

Definition at line 206 of file MFrequency.h.

Member Enumeration Documentation

enum casacore::MFrequency::Types

Types of known MFrequencies
Warning: The order defines the order in the translation matrix FromTo in the getConvert routine; Do not change the order without changing the array; Additions should be made before N_types, and an additional row and column should be coded in FromTo, and in showType();

Enumerator
REST
LSRK
LSRD
BARY
GEO
TOPO
GALACTO
LGROUP
CMB
N_Types
Undefined
N_Other
EXTRA	all extra bits
DEFAULT	Defaults.
LSR	Synonyms.

Definition at line 176 of file MFrequency.h.

Constructor & Destructor Documentation

casacore::MFrequency::MFrequency ( )

Tip: In the following constructors and other functions, all MeasRef can be replaced with simple Measure::TYPE where no offsets or frames are needed in the reference;
Default constructor; generates a zero rest frequency

casacore::MFrequency::MFrequency ( const MVFrequency & dt )

Create from data and reference.

casacore::MFrequency::MFrequency	(	const MVFrequency &	dt,
		const MFrequency::Ref &	rf
	)

casacore::MFrequency::MFrequency	(	const MVFrequency &	dt,
		MFrequency::Types	rf
	)

casacore::MFrequency::MFrequency ( const Quantity & dt )

casacore::MFrequency::MFrequency	(	const Quantity &	dt,
		const MFrequency::Ref &	rf
	)

casacore::MFrequency::MFrequency	(	const Quantity &	dt,
		MFrequency::Types	rf
	)

casacore::MFrequency::MFrequency ( const Measure * dt )

casacore::MFrequency::MFrequency ( const MeasValue * dt )

virtual casacore::MFrequency::~MFrequency ( )

virtual

Member Function Documentation

static const String* casacore::MFrequency::allMyTypes	(	Int &	nall,
		Int &	nextra,
		const uInt *&	typ
	)

static

virtual const String* casacore::MFrequency::allTypes	(	Int &	nall,
		Int &	nextra,
		const uInt *&	typ
	)		const

virtual

Get a list of all known reference codes.

nall returns the number in list, nextra the number of specials (like planets) that should be at end of list). typ returns the list of corresponding types.

Reimplemented from casacore::Measure.

static void casacore::MFrequency::assure ( const Measure & in )

static

static MFrequency::Types casacore::MFrequency::castType ( uInt tp )

static

Translate reference code.

The uInt version has a check for valid codes (i.e. it is a safe cast).

Thrown Exceptions

AipsError in the uInt interface if illegal code given

static void casacore::MFrequency::checkMyTypes ( )

static

virtual void casacore::MFrequency::checkTypes ( ) const

virtual

Check if all internal tables of types (both enum and String) are complete and correct.

This function is called automatically if and when necessary.

Thrown Exceptions

AipsError if a (programming) error in the types.

Implements casacore::Measure.

virtual Measure* casacore::MFrequency::clone ( ) const

virtual

Make a copy.

Implements casacore::Measure.

static MFrequency casacore::MFrequency::fromDoppler	(	const MDoppler &	dop,
		const MVFrequency &	rest
	)

static

Make a frequency from the Doppler velocity and the specified rest frequency (default reference type LSRK)

static MFrequency casacore::MFrequency::fromDoppler	(	const MDoppler &	dop,
		const MVFrequency &	rest,
		MFrequency::Types	type
	)

static

static MFrequency casacore::MFrequency::fromDoppler	(	const Measure &	dop,
		const MVFrequency &	rest,
		MFrequency::Types	type
	)

static

For internal use only.

Quantity casacore::MFrequency::get ( const Unit & un ) const

Get frequency in specified units.

virtual const String& casacore::MFrequency::getDefaultType ( ) const

virtual

Get the default reference type.

Implements casacore::Measure.

virtual String casacore::MFrequency::getRefString ( ) const

virtual

Get the reference type (for records, including codes like R_)

Implements casacore::Measure.

static Bool casacore::MFrequency::getType	(	MFrequency::Types &	tp,
		const String &	in
	)

static

Translate string to reference code.

Referenced by casa::ScantableFrequenciesIterator::getEntry(), and casa::PlotMSTransformations::setFrame().

Bool casacore::MFrequency::giveMe	(	MFrequency::Ref &	mr,
		const String &	in
	)

static uInt casacore::MFrequency::myType ( )

static

Get my type (as Register)

virtual Bool casacore::MFrequency::setOffset ( const Measure & in )

virtual

Set the offset in the reference (False if non-matching Measure)

Implements casacore::Measure.

virtual Bool casacore::MFrequency::setRefString ( const String & in )

virtual

Set the reference type to the specified String.

False if illegal string, reference set to DEFAULT.

Implements casacore::Measure.

static const String& casacore::MFrequency::showMe ( )

static

static const String& casacore::MFrequency::showType ( MFrequency::Types tp )

static

Referenced by casa::PlotMSTransformations::frameStr().

static const String& casacore::MFrequency::showType ( uInt tp )

static

virtual const String& casacore::MFrequency::tellMe ( ) const

virtual

Tell me your type.

Implements casacore::Measure.

MDoppler casacore::MFrequency::toDoppler ( const MVFrequency & rest )

Make a Doppler velocity from the frequency and the specified rest frequency.

MDoppler casacore::MFrequency::toDoppler ( const MVFrequency & rest ) const

static MDoppler casacore::MFrequency::toDoppler	(	const Measure &	in,
		const MVFrequency &	rest
	)

static

Local use only.

MFrequency casacore::MFrequency::toRest ( const MDoppler & dop ) const

Make a rest frequency using a Doppler velocity.

static MFrequency casacore::MFrequency::toRest	(	const Measure &	in,
		const Measure &	dop
	)

static

For local use only.

virtual uInt casacore::MFrequency::type ( ) const

virtual

Get the type (== Register() of derived Measure (faster than Strings) All should have: static uInt myType();.

Implements casacore::Measure.

static MFrequency::Types casacore::MFrequency::typeFromString ( const String & in )

static

Throws an exception if the type string is not recognized.

Friends And Related Function Documentation

friend class MeasConvert< MFrequency >

friend

Conversion of data.

Definition at line 166 of file MFrequency.h.

The documentation for this class was generated from the following file:

casa/casacore/measures/Measures/MFrequency.h

Public Types

Public Member Functions

Static Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Intended use:

Review Status

Prerequisite

Etymology

Synopsis

Example

Motivation

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Thrown Exceptions

Thrown Exceptions

Friends And Related Function Documentation