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casacore
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Interconvert pixel positions and directions (e.g. RA/DEC). More...
#include <DirectionCoordinate.h>
Public Member Functions | |
| DirectionCoordinate () | |
| The default constructor creates a J2000 DirectionCoordinate with a CARtesion projection with longitude,latitude 0,0 at pixel 0,0 and an increment of +1 radian per pixel on both axes. More... | |
| DirectionCoordinate (MDirection::Types directionType, const Projection &projection, Double refLong, Double refLat, Double incLong, Double incLat, const Matrix< Double > &xform, Double refX, Double refY, Double longPole=999.0, Double latPole=999.0) | |
| Define the DirectionCoordinate transformation. More... | |
| DirectionCoordinate (MDirection::Types directionType, const Projection &projection, const Quantum< Double > &refLong, const Quantum< Double > &refLat, const Quantum< Double > &incLong, const Quantum< Double > &incLat, const Matrix< Double > &xform, Double refX, Double refY, const Quantum< Double > &longPole=Quantum< Double >(999.0, Unit("rad")), const Quantum< Double > &latPole=Quantum< Double >(999.0, Unit("rad"))) | |
| Create DirectionCoordinate with Quantum-based interface. More... | |
| DirectionCoordinate (MDirection::Types directionType, const ::wcsprm &wcs, Bool oneRel=True) | |
| Constructor from WCS structure; must hold ONLY a celestial wcs structure Specify whether the absolute pixel coordinates in the wcs structure are 0- or 1-relative. More... | |
| DirectionCoordinate (const DirectionCoordinate &other) | |
| Copy constructor (copy semantics) More... | |
| DirectionCoordinate & | operator= (const DirectionCoordinate &other) |
| Assignment (copy semantics). More... | |
| virtual | ~DirectionCoordinate () |
| Destructor. More... | |
| virtual Coordinate::Type | type () const |
| Return Coordinate::DIRECTION. More... | |
| virtual String | showType () const |
| Always returns the String "Direction". More... | |
| virtual uInt | nPixelAxes () const |
| Always returns 2. More... | |
| virtual uInt | nWorldAxes () const |
| void | setReferenceConversion (MDirection::Types type) |
| Set extra conversion type. More... | |
| void | getReferenceConversion (MDirection::Types &type) const |
| virtual Bool | toWorld (Vector< Double > &world, const Vector< Double > &pixel, Bool useConversionFrame=True) const |
| Convert a pixel position to a world position or vice versa. More... | |
| virtual Bool | toPixel (Vector< Double > &pixel, const Vector< Double > &world) const |
world values must have units equivalent to the world axis units. More... | |
| virtual Bool | toMix (Vector< Double > &worldOut, Vector< Double > &pixelOut, const Vector< Double > &worldIn, const Vector< Double > &pixelIn, const Vector< Bool > &worldAxes, const Vector< Bool > &pixelAxes, const Vector< Double > &worldMin, const Vector< Double > &worldMax) const |
| Mixed pixel/world coordinate conversion. More... | |
| virtual Bool | setWorldMixRanges (const IPosition &shape) |
Compute and retrieve the world min and max ranges, for use in function toMix, for a lattice of the given shape (for this coordinate). More... | |
| virtual void | setDefaultWorldMixRanges () |
| void | setWorldMixRanges (const Vector< Bool > &which, const Vector< Double > &world) |
| Non-virtual function. More... | |
| Bool | toWorld (MDirection &world, const Vector< Double > &pixel) const |
| A convenient way to turn the world vector into an MDirection or MVDirection for further processing in the Measures system. More... | |
| Bool | toPixel (Vector< Double > &pixel, const MDirection &world) const |
| Bool | toWorld (MVDirection &world, const Vector< Double > &pixel) const |
| Bool | toPixel (Vector< Double > &pixel, const MVDirection &world) const |
| MVDirection | toWorld (const Vector< Double > &pixel) const |
| Vector< Double > | toPixel (const MVDirection &world) const |
| Vector< Double > | toPixel (const MDirection &world) const |
| virtual Bool | toWorldMany (Matrix< Double > &world, const Matrix< Double > &pixel, Vector< Bool > &failures) const |
| Batch up a lot of transformations. More... | |
| virtual Bool | toPixelMany (Matrix< Double > &pixel, const Matrix< Double > &world, Vector< Bool > &failures) const |
| virtual void | makeWorldRelative (Vector< Double > &world) const |
| Make absolute world coordinates relative and vice-versa (relative to the reference value). More... | |
| virtual void | makeWorldRelative (MDirection &world) const |
| virtual void | makeWorldAbsolute (Vector< Double > &world) const |
| virtual void | makeWorldAbsolute (MDirection &world) const |
| virtual void | makeWorldAbsoluteRef (Vector< Double > &world, const Vector< Double > &refVal) const |
| Make absolute coordinates relative and vice versa with respect to the given reference value. More... | |
| MDirection::Types | directionType (Bool showConversion=False) const |
| Recover the requested attribute. More... | |
| Projection | projection () const |
| virtual Vector< String > | worldAxisNames () const |
| Return the requested attributed. More... | |
| virtual Vector< String > | worldAxisUnits () const |
| virtual Vector< Double > | referenceValue () const |
| virtual Vector< Double > | increment () const |
| virtual Matrix< Double > | linearTransform () const |
| virtual Vector< Double > | referencePixel () const |
| virtual Bool | setWorldAxisNames (const Vector< String > &names) |
| Set the value of the requested attribute. More... | |
| virtual Bool | setReferencePixel (const Vector< Double > &refPix) |
| virtual Bool | setLinearTransform (const Matrix< Double > &xform) |
| virtual Bool | setIncrement (const Vector< Double > &inc) |
| virtual Bool | setReferenceValue (const Vector< Double > &refval) |
| virtual Bool | setWorldAxisUnits (const Vector< String > &units) |
| Change the world axis units. More... | |
| virtual Bool | near (const Coordinate &other, Double tol=1e-6) const |
| Comparison function. More... | |
| virtual Bool | near (const Coordinate &other, const Vector< Int > &excludeAxes, Double tol=1e-6) const |
| virtual void | getPrecision (Int &precision, Coordinate::formatType &format, Bool showAsAbsolute, Int defPrecScientific, Int defPrecFixed, Int defPrecTime) const |
| Format a DirectionCoordinate coordinate world value nicely through the common format interface. More... | |
| virtual String | format (String &units, Coordinate::formatType format, Double worldValue, uInt axis, Bool isAbsolute, Bool showAsAbsolute, Int precision=-1, Bool usePrecForMixed=False) const |
| Bool | cylindricalFix (Int shapeLong, Int shapeLat) |
| Fix cylindrical coordinates to put the longitude in [-180,180] range. More... | |
| virtual Coordinate * | makeFourierCoordinate (const Vector< Bool > &axes, const Vector< Int > &shape) const |
| Find the Coordinate for when we Fourier Transform ourselves. More... | |
| virtual Bool | save (RecordInterface &container, const String &fieldName) const |
| Save the DirectionCoordinate into the supplied record using the supplied field name. More... | |
| virtual Coordinate * | clone () const |
| Make a copy of the DirectionCoordinate using new. More... | |
| Vector< Double > | longLatPoles () const |
| Fish out the ref and non-native poles (refLong, refLat, longPole, latPole) Not for general use. More... | |
| Quantity | getPixelArea () const |
| get the pixel area. More... | |
| DirectionCoordinate | convert (Quantity &angle, MDirection::Types directionType) const |
| Convert this coordinate to another reference frame by rotating it about the reference pixel so the the axes of the new reference frame are aligned along the current pixel axes. More... | |
| void | setProjection (const Projection &) |
| Set the projection. More... | |
| void | setReferenceFrame (const MDirection::Types rf) |
| Set the base (as opposed to conversion) reference frame. More... | |
| Bool | hasSquarePixels () const |
| Are the pixels square? More... | |
| Bool | isNCP () const |
| Is the projection equivalent to NCP? More... | |
 Public Member Functions inherited from casacore::Coordinate | |
| virtual | ~Coordinate () |
| Destructor. More... | |
| Vector< Double > | worldMixMin () const |
| Vector< Double > | worldMixMax () const |
| virtual void | makePixelRelative (Vector< Double > &pixel) const |
| Make absolute coordinates relative and vice-versa (with respect to the reference value). More... | |
| virtual void | makePixelAbsolute (Vector< Double > &pixel) const |
| virtual void | makePixelRelativeMany (Matrix< Double > &pixel) const |
| Batch up a lot of absolute/relative transformations. More... | |
| virtual void | makePixelAbsoluteMany (Matrix< Double > &pixel) const |
| virtual void | makeWorldRelativeMany (Matrix< Double > &world) const |
| virtual void | makeWorldAbsoluteMany (Matrix< Double > &world) const |
| const String & | errorMessage () const |
| If the last conversion to world or pixel coordinates resulted in an error, report that error. More... | |
| String | formatQuantity (String &units, Coordinate::formatType format, const Quantum< Double > &worldValue, uInt axis, Bool isAbsolute=True, Bool showAsAbsolute=True, Int precision=-1) |
| virtual Bool | doNearPixel (const Coordinate &other, const Vector< Bool > &thisAxes, const Vector< Bool > &otherAxes, Double tol=1.0e-6) const |
| Comparison only made for specified axes in this and other Coordinate The default implementation should be ok for all Coordinate types except Stokes and Quality... More... | |
| virtual Coordinate * | rotate (const Quantum< Double > &angle) const |
| return the result of rotating the coordinate clockwise through the specified angle. More... | |
Static Public Member Functions | |
| static Vector< String > | axisNames (MDirection::Types type, Bool FITSName=False) |
| Return canonical axis names for the given MDirection type, giving FITS names if desired. More... | |
| static DirectionCoordinate * | restore (const RecordInterface &container, const String &fieldName) |
| Recover the DirectionCoordinate from a record. More... | |
| Static Public Member Functions inherited from casacore::Coordinate | |
| static String | typeToString (Coordinate::Type type) |
| static void | set_wcs (::wcsprm &wcs) |
| Call wcsset on the wcs structure. More... | |
| static void | init_wcs (::wcsprm &wcs, int naxis) |
| Call wcsini on the wcs structure. More... | |
| static void | sub_wcs (const ::wcsprm &src, int &nsub, int axes[],::wcsprm &dst) |
| Call wcssub on the src/dst pair. More... | |
| static void | copy_wcs (const ::wcsprm &src,::wcsprm &dst) |
| Call wcssub on the src/dst pair with null nsub/axes. More... | |
Private Member Functions | |
| void | toCurrent (Vector< Double > °rees) const |
| Interconvert between the current units and wcs units (degrees) More... | |
| void | fromCurrent (Vector< Double > ¤t) const |
| void | checkFormat (Coordinate::formatType &format, Bool absolute) const |
| Check formatting types. More... | |
| String | formatLatitude (String &units, MVAngle &mVA, Bool absolute, Coordinate::formatType form, Int prec) const |
| Format a latitude. More... | |
| String | formatLongitude (String &units, MVAngle &mVA, MDirection::GlobalTypes gtype, Bool absolute, Coordinate::formatType form, Int prec) const |
| Format a longitude. More... | |
| Bool | toMix2 (Vector< Double > &out, const Vector< Double > &in, const Vector< Double > &minWorld, const Vector< Double > &maxWorld, Bool longIsWorld) const |
| Mixed pixel/world coordinate conversion. More... | |
| void | initializeFactors () |
| Initialize unit conversion vectors and units. More... | |
| void | makeDirectionCoordinate (MDirection::Types directionType, const Projection &proj, Double refLong, Double refLat, Double incLong, Double incLat, const Matrix< Double > &xform, Double refX, Double refY, Double longPole, Double latPole) |
| Helper functions interfacing to WCS. More... | |
| void | makeWCS (::wcsprm &wcs, const Matrix< Double > &xform, const Projection &proj, MDirection::Types directionType, Double refPixLong, Double refPixLat, Double refLong, Double refLat, Double incLong, Double incLat, Double longPole, Double latPole) |
| void | normalizePCMatrix () |
| Normalize each row of the PC matrix such that increment() will return the actual angular increment and any scale factors are removed from the PC matrix (modifies wcs_p.pc and wcs_p.cdelt and wcs_p.altlin, executes set_wcs() and hence wcsset() on the struct) See Greisen & Calabretta, A&A 395, 1061-1075 (2002), equation (4) More... | |
| Double | putLongInPiRange (Double lon, const String &unit) const |
| void | makeConversionMachines () |
| Set up conversion machine. More... | |
| virtual void | convertTo (Vector< Double > &world) const |
| Convert from type_p -> conversionType_p. More... | |
| virtual void | convertFrom (Vector< Double > &world) const |
| void | copy (const DirectionCoordinate &other) |
| Copy private data. More... | |
| void | setRotationMatrix () |
| Set up the offset coordinate rotation matrix. More... | |
| void | setRotationMatrix (RotMatrix &rot, Double lon, Double lat) const |
| const Vector< Double > | toCurrentFactors () const |
| Return unit conversion vector for converting to current units. More... | |
Private Attributes | |
| MDirection::Types | type_p |
| Direction type. More... | |
| MDirection::Types | conversionType_p |
| Projection | projection_p |
| Projection parameters. More... | |
| mutable::wcsprm | wcs_p |
| WCS structure. More... | |
| Vector< Double > | to_degrees_p |
| WCS computes in degrees - use this to convert back and forth between current DirectionCoordinate units and degrees or radians. More... | |
| Vector< Double > | to_radians_p |
| Vector< String > | names_p |
| Axis names. More... | |
| Vector< String > | units_p |
| Current units. More... | |
| RotMatrix | rot_p |
| Rotation matrix used to handle relative coordinates. More... | |
| MDirection::Convert * | pConversionMachineTo_p |
| Conversion machines. More... | |
| MDirection::Convert * | pConversionMachineFrom_p |
Additional Inherited Members | |
| Public Types inherited from casacore::Coordinate | |
| enum | Type { LINEAR, DIRECTION, SPECTRAL, STOKES, TABULAR, QUALITY, COORDSYS } |
| This enum lists the types of the derived classes. More... | |
| enum | formatType { DEFAULT, SCIENTIFIC, FIXED, MIXED, TIME } |
| This enum is used for formatting world values into Strings. More... | |
| Protected Member Functions inherited from casacore::Coordinate | |
| Coordinate () | |
| Default constructor. More... | |
| Coordinate (const Coordinate &other) | |
| Copy constructor (copy semantics) More... | |
| Coordinate & | operator= (const Coordinate &other) |
| Assignment (copy semantics) More... | |
| void | set_error (const String &errorMsg) const |
| Set error message. More... | |
| Bool | find_scale_factor (String &error, Vector< Double > &factor, const Vector< String > &units, const Vector< String > &oldUnits) |
| void | fourierUnits (String &nameOut, String &unitOut, String &unitInCanon, Coordinate::Type type, Int axis, const String &unitIn, const String &nameIn) const |
| Tries to find a canonical unit for input unit (e.g. More... | |
| Bool | toWorldWCS (Vector< Double > &world, const Vector< Double > &pixel, wcsprm &wcs) const |
| Functions to interconvert pixel<->world via wcs. More... | |
| Bool | toPixelWCS (Vector< Double > &pixel, const Vector< Double > &world, wcsprm &wcs) const |
| Bool | toWorldManyWCS (Matrix< Double > &world, const Matrix< Double > &pixel, Vector< Bool > &failures, wcsprm &wcs) const |
| Bool | toPixelManyWCS (Matrix< Double > &pixel, const Matrix< Double > &world, Vector< Bool > &failures, wcsprm &wcs) const |
| void | toCurrentMany (Matrix< Double > &world, const Vector< Double > &toCurrentFactors) const |
| Functions for handling conversion between the current units and the wcs units. More... | |
| void | fromCurrentMany (Matrix< Double > &world, const Vector< Double > &toCurrentFactors) const |
| void | convertToMany (Matrix< Double > &world) const |
| Functions for handling conversion between the current reference frame and the native one for many conversions. More... | |
| void | convertFromMany (Matrix< Double > &world) const |
| void | pcToXform (Matrix< Double > &xForm, const wcsprm &wcs) const |
| Interconvert between wcs PC cards and Matrix xForm format. More... | |
| void | xFormToPC (wcsprm &wcs, const Matrix< Double > &xForm) const |
| Protected Attributes inherited from casacore::Coordinate | |
| Vector< Double > | worldMin_p |
| toMix ranges. More... | |
| Vector< Double > | worldMax_p |
Interconvert pixel positions and directions (e.g. RA/DEC).
Public interface
J2000 to B1950). This class implements pixel to world coordinate conversions. This class implements geometric conversions (e.g. SIN projection) via the WCS library and also provides an interface to astronomical conversions (RA/DEC <–> l,b) via the Measures module.
Caution: All absolute pixels coordinates are zero relative;
Let's make a DirectionCoordinate — used to represent a direction, usually an RA/DEC, but it could also be, e.g., an AZ/EL pair.
xy<–>world. SIN is the most common projection for radio interferometers. Note that SIN can optionally take parameters as defined in Calabretta and Greisen. If not provided, they default to 0.0, which is the "old" SIN convention. In this example is is more convenient to change the units to degrees. This can be accomplished as follows:
The increment and reference value are updated appropriately.
Set up a couple of vectors to use the world and pixel coordinate values.
We use 138 as an arbitrary pixel position which is near the reference pixel so we can tell if the answers look foolish or not. We can actually perform a transformation like this as follows. If it succeeds we print the value of the world coordinate.
There is an overloaded "toWorld" function that produces an MDirection in case you want to, e.g., find out what the position in B1950 coordinates would be.
The reverse transformation takes place similarly:
We could also have made the above DirectionCoordinate using the Quantum-based constructor, which is a little more elegant if you want to use degrees.
Matrix<Double> xform(2,2); xform = 0.0; xform.diagonal() = 1.0; Quantum<Double> refLon(135.0, "deg"); Quantum<Double> refLat(60.0, "deg"); Quantum<Double> incLon(-1.0, "deg"); Quantum<Double> incLat(1.0, "deg"); DirectionCoordinate radec(MDirection::J2000, Projection(Projection::SIN), refLon, refLat, incLon, incLat, xform, 128, 128);
But note that the constructor will have converted the native units of the DirectionCoordinate to radians. So the Double-based toWorld and toPixel functions will be in terms of radians. If you want the native units to be degrees, then again you can use
and thereafter degrees are the native units.
Directions in the sky are fundamental to astronomy.
Definition at line 217 of file DirectionCoordinate.h.
| casacore::DirectionCoordinate::DirectionCoordinate | ( | ) |
The default constructor creates a J2000 DirectionCoordinate with a CARtesion projection with longitude,latitude 0,0 at pixel 0,0 and an increment of +1 radian per pixel on both axes.
| casacore::DirectionCoordinate::DirectionCoordinate | ( | MDirection::Types | directionType, |
| const Projection & | projection, | ||
| Double | refLong, | ||
| Double | refLat, | ||
| Double | incLong, | ||
| Double | incLat, | ||
| const Matrix< Double > & | xform, | ||
| Double | refX, | ||
| Double | refY, | ||
| Double | longPole = 999.0, |
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| Double | latPole = 999.0 |
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| ) |
Define the DirectionCoordinate transformation.
refLong and refLat will normally the the RA/DEC of the pixel described by refX/refY. incLat/incLong are the increments per pixel (RA is usually negative), and the xform matrix is usually the unit diagonal matrix unless you have a rotation or some other linear transformation between the pixel and world axes.
Note that the units are radians initially. You can change it to degrees or something else with the setWorldAxisUnits method later if you want.
longPole and latPole are defined by Calabretta and Greisen (these are reference points not at the native pole). In general you can leave these out and the default values will cause them to be computed appropriately. However, when reading from FITS the LONPOLE and LATPOLE keywords are passed along here.
| casacore::DirectionCoordinate::DirectionCoordinate | ( | MDirection::Types | directionType, |
| const Projection & | projection, | ||
| const Quantum< Double > & | refLong, | ||
| const Quantum< Double > & | refLat, | ||
| const Quantum< Double > & | incLong, | ||
| const Quantum< Double > & | incLat, | ||
| const Matrix< Double > & | xform, | ||
| Double | refX, | ||
| Double | refY, | ||
| const Quantum< Double > & | longPole = Quantum< Double >(999.0, Unit("rad")), |
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| const Quantum< Double > & | latPole = Quantum< Double >(999.0, Unit("rad")) |
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| ) |
Create DirectionCoordinate with Quantum-based interface.
Parameters are the same as above. Regardless of the units of the quanta, the initial units of the DirectionCoordinate will be converted radians. You can change it to degrees or something else with the setWorldAxisUnits method later if you want.
longPole and latPole are defined by Calabretta and Greisen (these are reference points not at the native pole). In general you can leave these out and the default values will cause them to be computed appropriately. However, when reading from FITS the LONPOLE and LATPOLE keywords are passed along here. To get the default the 999.0 value should be used (units are irrelevant in that case)
| casacore::DirectionCoordinate::DirectionCoordinate | ( | MDirection::Types | directionType, |
| const ::wcsprm & | wcs, | ||
| Bool | oneRel = True |
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| ) |
Constructor from WCS structure; must hold ONLY a celestial wcs structure Specify whether the absolute pixel coordinates in the wcs structure are 0- or 1-relative.
The coordinate is always constructed with 0-relative pixel coordinates
| casacore::DirectionCoordinate::DirectionCoordinate | ( | const DirectionCoordinate & | other | ) |
Copy constructor (copy semantics)
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Destructor.
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Return canonical axis names for the given MDirection type, giving FITS names if desired.
BEG think this should be in the MDirection class, but WNB disagrees. Leave it here for now.
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Check formatting types.
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Make a copy of the DirectionCoordinate using new.
The caller is responsible for calling delete.
Implements casacore::Coordinate.
| DirectionCoordinate casacore::DirectionCoordinate::convert | ( | Quantity & | angle, |
| MDirection::Types | directionType | ||
| ) | const |
Convert this coordinate to another reference frame by rotating it about the reference pixel so the the axes of the new reference frame are aligned along the current pixel axes.
The reference pixel remains the same and the conversion is exact for the reference pixel and in general becomes less accurate as distance from reference pixel increases. The latitude like and the longitude like pixel increments are preserved. Conversions which require extra information such as epoch and position are not supported. The angle parameter is the angle between the new coordinate and the pixel coordinate, measured clockwise from the positive y-axis of the new coordinate to the positive y-axis of the pixel coordinate; ie, it is the clockwise angle through which the current world coordinate would have to be rotated so that the new coordinate's axes would be parallel to the pixel axes. The accuracy of the returned angle is good to at least 7 digits.
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Reimplemented from casacore::Coordinate.
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Convert from type_p -> conversionType_p.
Reimplemented from casacore::Coordinate.
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Copy private data.
Fix cylindrical coordinates to put the longitude in [-180,180] range.
If False returned, it failed an an error is in errorMessage This fix is not done automatically internally because of the dependence on the image shape. It should be called for any foreign image (such as FITS) that is imported
| MDirection::Types casacore::DirectionCoordinate::directionType | ( | Bool | showConversion = False | ) | const |
Recover the requested attribute.
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Reimplemented from casacore::Coordinate.
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Format a latitude.
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Format a longitude.
| Quantity casacore::DirectionCoordinate::getPixelArea | ( | ) | const |
get the pixel area.
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Format a DirectionCoordinate coordinate world value nicely through the common format interface.
See Coordinate for basics.
Formatting types that are allowed are SCIENTIFIC, FIXED, MIXED, and TIME If you ask for format type Coordinate::DEFAULT then the selected format depends upon what the value of the enum MDirection::GlobalTypes is for this DirectionCoordinate. For example, if it is GRADEC or GHADEC you would get Coordinate::TIME style formatting (DD:MM:SS.SS), otherwise you would get Coordinate::FIXED formatting by default.
axis says which axis in this Coordinate we are formatting. We have to know this because we may format Longitude and Latitude differently. For Coordinate::TIME style formatting, precision refers to the places after the decimal in the SS field.
If you leave units empty, then it makes up a nice unit for you.
Reimplemented from casacore::Coordinate.
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Definition at line 321 of file DirectionCoordinate.h.
References conversionType_p.
| Bool casacore::DirectionCoordinate::hasSquarePixels | ( | ) | const |
Are the pixels square?
Implements casacore::Coordinate.
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Initialize unit conversion vectors and units.
| Bool casacore::DirectionCoordinate::isNCP | ( | ) | const |
Is the projection equivalent to NCP?
Implements casacore::Coordinate.
Fish out the ref and non-native poles (refLong, refLat, longPole, latPole) Not for general use.
Units are degrees.
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Set up conversion machine.
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Helper functions interfacing to WCS.
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Find the Coordinate for when we Fourier Transform ourselves.
This pointer must be deleted by the caller. Axes specifies which axes of the Coordinate you wish to transform. Shape specifies the shape of the image associated with all the axes of the Coordinate. Currently the output reference pixel is always shape/2. If the pointer returned is 0, it failed with a message in errorMessage
Reimplemented from casacore::Coordinate.
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Reimplemented from casacore::Coordinate.
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Make absolute coordinates relative and vice versa with respect to the given reference value.
Add the other functions in this grouping as needed.
Reimplemented from casacore::Coordinate.
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Make absolute world coordinates relative and vice-versa (relative to the reference value).
Note that these functions are independent of the MDirection::Types (set either at construction or by function setReferenceConversion). The vectors must be of length nWorldAxes or memory access errors will occur
Reimplemented from casacore::Coordinate.
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Comparison function.
Any private Double data members are compared with the specified fractional tolerance. Don't compare on the specified axes in the Coordinate. If the comparison returns False, method errorMessage returns a message about why.
Implements casacore::Coordinate.
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Implements casacore::Coordinate.
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Normalize each row of the PC matrix such that increment() will return the actual angular increment and any scale factors are removed from the PC matrix (modifies wcs_p.pc and wcs_p.cdelt and wcs_p.altlin, executes set_wcs() and hence wcsset() on the struct) See Greisen & Calabretta, A&A 395, 1061-1075 (2002), equation (4)
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Always returns 2.
Implements casacore::Coordinate.
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Implements casacore::Coordinate.
| DirectionCoordinate& casacore::DirectionCoordinate::operator= | ( | const DirectionCoordinate & | other | ) |
Assignment (copy semantics).
| Projection casacore::DirectionCoordinate::projection | ( | ) | const |
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Implements casacore::Coordinate.
Implements casacore::Coordinate.
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Recover the DirectionCoordinate from a record.
A null pointer means that the restoration did not succeed.
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Save the DirectionCoordinate into the supplied record using the supplied field name.
The field must not exist, otherwise False is returned.
Implements casacore::Coordinate.
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Reimplemented from casacore::Coordinate.
Implements casacore::Coordinate.
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Implements casacore::Coordinate.
| void casacore::DirectionCoordinate::setProjection | ( | const Projection & | ) |
Set the projection.
| void casacore::DirectionCoordinate::setReferenceConversion | ( | MDirection::Types | type | ) |
Set extra conversion type.
Whenever a conversion from pixel to world is done, the world value is then further converted to this MDirection::Types value. For example, your DirectionCoordinate may be defined in J2000. You can use this to get the world values out in say GALACTIC. Similarly, whenever you convert from world to pixel, the world value is assumed to be that appropriate to the conversionDirectionType. It is first converted to the MDirection::Types with which the DirectionCoordinate was constructed and from there to pixel. If you don't call this function, or you set the same type for which the DirectionCoordinate was constructed, no extra conversions occur. Some conversions will fail. These are the ones that require extra frame information (epoch, position) such as to AZEL from J2000 etc. This will be added later.
In the mixed pixel/world conversion routine toMix the implementation is only partial. See the comments for this function below.
| void casacore::DirectionCoordinate::setReferenceFrame | ( | const MDirection::Types | rf | ) |
Set the base (as opposed to conversion) reference frame.
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Implements casacore::Coordinate.
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Implements casacore::Coordinate.
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Set up the offset coordinate rotation matrix.
Units of long and lat are current world units
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Set the value of the requested attribute.
Note that these just change the internal values, they do not cause any recomputation.
Implements casacore::Coordinate.
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Change the world axis units.
Adjust the increment and reference value by the ratio of the old and new units. The units must be compatible with angle. The units are initially "rad" (radians).
Implements casacore::Coordinate.
Compute and retrieve the world min and max ranges, for use in function toMix, for a lattice of the given shape (for this coordinate).
Using these ranges in toMix should speed it up and help avoid ambiguity. If the shape is negative, that indicates that the shape is unknown for that axis. The default range is used for that axis. This situation arises in a CoordinateSystem for which a pixel, but not a world axis has been removed. The output vectors are resized. Returns False if fails (and then setDefaultWorldMixRanges generates the ranges) with a reason in errorMessage(). The setDefaultWorldMixRanges function just gives you [-90->90], [-180,180] (in appropriate units)
Reimplemented from casacore::Coordinate.
| void casacore::DirectionCoordinate::setWorldMixRanges | ( | const Vector< Bool > & | which, |
| const Vector< Double > & | world | ||
| ) |
Non-virtual function.
When which is T, use the world value as the center for the mix world range.
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Always returns the String "Direction".
Implements casacore::Coordinate.
Interconvert between the current units and wcs units (degrees)
Return unit conversion vector for converting to current units.
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Mixed pixel/world coordinate conversion.
worldIn and worldAxes are of length nWorldAxes. pixelIn and pixelAxes are of length nPixelAxes. worldAxes(i)=True specifies you have given a world value in worldIn(i) to convert to pixel. pixelAxes(i)=True specifies you have given a pixel value in pixelIn(i) to convert to world. You cannot specify the same axis via worldAxes and pixelAxes. Values in pixelIn are converted to world and put into worldOut in the appropriate world axis location. Values in worldIn are copied to worldOut. Values in worldIn are converted to pixel and put into pixelOut in the appropriate pixel axis location. Values in pixelIn are copied to pixelOut.
worldMin and worldMax specify the range of the world coordinate (in the world axis units of that world axis in the CoordinateSystem) being solved for in a mixed calculation for each world axis. Some mixed solutions can be degenerate, whereupon you you must say which one you want. Use functions setWorldMixRanges and worldMixMin, worldMixMax to set these ranges, If you don't know, use the defaults (function setDefaultWorldMixRanges. Removed axes are handled (for example, a removed pixel axis with remaining corresponding world axis will correctly be converted to world using the replacement value). Returns True if the conversion succeeds, otherwise it returns False and errorMessage() contains an error message. The output vectors are resized.
If you actually request a pure pixel to world or world to pixel via toMix, then the functions toWorld or toPixel will be invoked directly (see above) and the extra conversion layer invoked through function setReferenceConversion will be active. However, if you request a true mixed pixel/world conversion, the extra conversion layer is not activated (because of the nature of mixed conversions). This situation may change in the future with a partial implementation added.
Reimplemented from casacore::Coordinate.
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Mixed pixel/world coordinate conversion.
Vector in must be length nWorldAxes (2). Specify whether longitude (in(0)) or latitude (in(1)) is the world coordinate. It is assumed that the other value is the pixel coordinate.
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world values must have units equivalent to the world axis units.
If the coordinate has a conversion layer, the world coordinates must be supplied in the conversion frame.
Implements casacore::Coordinate.
| Bool casacore::DirectionCoordinate::toPixel | ( | Vector< Double > & | pixel, |
| const MDirection & | world | ||
| ) | const |
| Bool casacore::DirectionCoordinate::toPixel | ( | Vector< Double > & | pixel, |
| const MVDirection & | world | ||
| ) | const |
| Vector<Double> casacore::DirectionCoordinate::toPixel | ( | const MVDirection & | world | ) | const |
| Vector<Double> casacore::DirectionCoordinate::toPixel | ( | const MDirection & | world | ) | const |
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Reimplemented from casacore::Coordinate.
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Convert a pixel position to a world position or vice versa.
Returns True if the conversion succeeds, otherwise it returns False and method errorMessage returns its error message. The output vectors are appropriately resized. if useConversionFrame, if the coordinate has a conversion layer frame, it is used. Else, the native frame is used for the conversion.
Implements casacore::Coordinate.
| Bool casacore::DirectionCoordinate::toWorld | ( | MDirection & | world, |
| const Vector< Double > & | pixel | ||
| ) | const |
A convenient way to turn the world vector into an MDirection or MVDirection for further processing in the Measures system.
We could improve the performance of this if it would be useful. However it is expected that normally one would just call this once to get a template MDirection, and then call the vector versions.
In case of a failure, the versions with a Bool return value will return False. The other versions will throw an exception.
| Bool casacore::DirectionCoordinate::toWorld | ( | MVDirection & | world, |
| const Vector< Double > & | pixel | ||
| ) | const |
| MVDirection casacore::DirectionCoordinate::toWorld | ( | const Vector< Double > & | pixel | ) | const |
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Batch up a lot of transformations.
The first (most rapidly varying) axis of the matrices contain the coordinates. Returns False if any conversion failed and errorMessage() will hold a message. The failures array is the length of the number of conversions (True for failure, False for success)
Reimplemented from casacore::Coordinate.
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Return Coordinate::DIRECTION.
Implements casacore::Coordinate.
Return the requested attributed.
Implements casacore::Coordinate.
Implements casacore::Coordinate.
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Definition at line 618 of file DirectionCoordinate.h.
Referenced by getReferenceConversion().
Axis names.
Definition at line 635 of file DirectionCoordinate.h.
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Definition at line 647 of file DirectionCoordinate.h.
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Conversion machines.
"To" handles type_p -> conversionType_p "From" handles conversionType_p -> type_p;
Definition at line 646 of file DirectionCoordinate.h.
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Projection parameters.
Definition at line 621 of file DirectionCoordinate.h.
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Rotation matrix used to handle relative coordinates.
Definition at line 641 of file DirectionCoordinate.h.
WCS computes in degrees - use this to convert back and forth between current DirectionCoordinate units and degrees or radians.
Definition at line 631 of file DirectionCoordinate.h.
Definition at line 632 of file DirectionCoordinate.h.
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Direction type.
Definition at line 618 of file DirectionCoordinate.h.
Current units.
Definition at line 638 of file DirectionCoordinate.h.
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WCS structure.
This is mutable because the wcs functions that do toPixel and toWorld (which have const signature) require a non const wcs structure. so either all of these virtual functions lose their const or we use mutable...
Definition at line 627 of file DirectionCoordinate.h.
1.8.5