LSST Applications
21.0.0-172-gfb10e10a+18fedfabac,22.0.0+297cba6710,22.0.0+80564b0ff1,22.0.0+8d77f4f51a,22.0.0+a28f4c53b1,22.0.0+dcf3732eb2,22.0.1-1-g7d6de66+2a20fdde0d,22.0.1-1-g8e32f31+297cba6710,22.0.1-1-geca5380+7fa3b7d9b6,22.0.1-12-g44dc1dc+2a20fdde0d,22.0.1-15-g6a90155+515f58c32b,22.0.1-16-g9282f48+790f5f2caa,22.0.1-2-g92698f7+dcf3732eb2,22.0.1-2-ga9b0f51+7fa3b7d9b6,22.0.1-2-gd1925c9+bf4f0e694f,22.0.1-24-g1ad7a390+a9625a72a8,22.0.1-25-g5bf6245+3ad8ecd50b,22.0.1-25-gb120d7b+8b5510f75f,22.0.1-27-g97737f7+2a20fdde0d,22.0.1-32-gf62ce7b1+aa4237961e,22.0.1-4-g0b3f228+2a20fdde0d,22.0.1-4-g243d05b+871c1b8305,22.0.1-4-g3a563be+32dcf1063f,22.0.1-4-g44f2e3d+9e4ab0f4fa,22.0.1-42-gca6935d93+ba5e5ca3eb,22.0.1-5-g15c806e+85460ae5f3,22.0.1-5-g58711c4+611d128589,22.0.1-5-g75bb458+99c117b92f,22.0.1-6-g1c63a23+7fa3b7d9b6,22.0.1-6-g50866e6+84ff5a128b,22.0.1-6-g8d3140d+720564cf76,22.0.1-6-gd805d02+cc5644f571,22.0.1-8-ge5750ce+85460ae5f3,master-g6e05de7fdc+babf819c66,master-g99da0e417a+8d77f4f51a,w.2021.48
LSST Data Management Base Package
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A 2-dimensional celestial WCS that transform pixels to ICRS RA/Dec, using the LSST standard for pixels. More...
#include <SkyWcs.h>
Public Member Functions | |
SkyWcs (SkyWcs const &)=default | |
SkyWcs (SkyWcs &&)=default | |
SkyWcs & | operator= (SkyWcs const &)=delete |
SkyWcs & | operator= (SkyWcs &&)=delete |
~SkyWcs () override=default | |
bool | operator== (SkyWcs const &other) const |
Equality is based on the string representations being equal. More... | |
bool | operator!= (SkyWcs const &other) const |
SkyWcs (daf::base::PropertySet &metadata, bool strip=false) | |
Construct a SkyWcs from FITS keywords. More... | |
SkyWcs (ast::FrameDict const &frameDict) | |
Construct a SkyWcs from an ast::FrameDict. More... | |
std::shared_ptr< SkyWcs > | copyAtShiftedPixelOrigin (lsst::geom::Extent2D const &shift) const |
Return a copy of this SkyWcs with the pixel origin shifted by the specified amount. More... | |
std::shared_ptr< daf::base::PropertyList > | getFitsMetadata (bool precise=false) const |
Return the WCS as FITS WCS metadata. More... | |
lsst::geom::Angle | getPixelScale (lsst::geom::Point2D const &pixel) const |
Get the pixel scale at the specified pixel position. More... | |
lsst::geom::Angle | getPixelScale () const |
Get the pixel scale at the pixel origin. More... | |
lsst::geom::Point2D | getPixelOrigin () const |
Get the pixel origin, in pixels, using the LSST convention. More... | |
lsst::geom::SpherePoint | getSkyOrigin () const |
Get the sky origin, the celestial fiducial point. More... | |
Eigen::Matrix2d | getCdMatrix (lsst::geom::Point2D const &pixel) const |
Get the 2x2 CD matrix at the specified pixel position. More... | |
Eigen::Matrix2d | getCdMatrix () const |
Get the 2x2 CD matrix at the pixel origin. More... | |
std::shared_ptr< SkyWcs > | getTanWcs (lsst::geom::Point2D const &pixel) const |
Get a local TAN WCS approximation to this WCS at the specified pixel position. More... | |
std::shared_ptr< const ast::FrameDict > | getFrameDict () const |
Get the contained FrameDict. More... | |
std::shared_ptr< const TransformPoint2ToSpherePoint > | getTransform () const |
Get a TransformPoint2ToSpherePoint that transforms pixels to sky in the forward direction and sky to pixels in the inverse direction. More... | |
bool | isFlipped () const |
Does the WCS follow the convention of North=Up, East=Left? More... | |
bool | isPersistable () const noexcept override |
Return true if this particular object can be persisted using afw::table::io. More... | |
lsst::geom::AffineTransform | linearizePixelToSky (lsst::geom::SpherePoint const &coord, lsst::geom::AngleUnit const &skyUnit) const |
Return the local linear approximation to pixelToSky at a point given in sky coordinates. More... | |
lsst::geom::AffineTransform | linearizePixelToSky (lsst::geom::Point2D const &pixel, lsst::geom::AngleUnit const &skyUnit) const |
Return the local linear approximation to pixelToSky at a point given in pixel coordinates. More... | |
lsst::geom::AffineTransform | linearizeSkyToPixel (lsst::geom::SpherePoint const &coord, lsst::geom::AngleUnit const &skyUnit) const |
Return the local linear approximation to skyToPixel at a point given in sky coordinates. More... | |
lsst::geom::AffineTransform | linearizeSkyToPixel (lsst::geom::Point2D const &pixel, lsst::geom::AngleUnit const &skyUnit) const |
Return the local linear approximation to skyToPixel at a point given in pixel coordinates. More... | |
lsst::geom::SpherePoint | pixelToSky (lsst::geom::Point2D const &pixel) const |
Compute sky position(s) from pixel position(s) More... | |
lsst::geom::SpherePoint | pixelToSky (double x, double y) const |
std::vector< lsst::geom::SpherePoint > | pixelToSky (std::vector< lsst::geom::Point2D > const &pixels) const |
lsst::geom::Point2D | skyToPixel (lsst::geom::SpherePoint const &sky) const |
Compute pixel position(s) from sky position(s) More... | |
std::vector< lsst::geom::Point2D > | skyToPixel (std::vector< lsst::geom::SpherePoint > const &sky) const |
bool | hasFitsApproximation () const |
Does this SkyWcs have an approximate SkyWcs that can be represented as standard FITS WCS? More... | |
bool | isFits () const |
Return true getFitsMetadata(true) will succeed, false if not. More... | |
void | writeStream (std::ostream &os) const |
Serialize this SkyWcs to an output stream. More... | |
std::string | writeString () const |
Serialize this SkyWcs to a string, using the same format as writeStream. More... | |
std::shared_ptr< typehandling::Storable > | cloneStorable () const override |
Create a new SkyWcs that is a copy of this one. More... | |
std::string | toString () const override |
Create a string representation of this object. More... | |
bool | equals (typehandling::Storable const &other) const noexcept override |
Compare this object to another Storable. More... | |
virtual std::size_t | hash_value () const |
Return a hash of this object (optional operation). More... | |
void | writeFits (std::string const &fileName, std::string const &mode="w") const |
Write the object to a regular FITS file. More... | |
void | writeFits (fits::MemFileManager &manager, std::string const &mode="w") const |
Write the object to a FITS image in memory. More... | |
void | writeFits (fits::Fits &fitsfile) const |
Write the object to an already-open FITS object. More... | |
Static Public Member Functions | |
static std::string | getShortClassName () |
static std::shared_ptr< SkyWcs > | readStream (std::istream &is) |
Deserialize a SkyWcs from an input stream. More... | |
static std::shared_ptr< SkyWcs > | readString (std::string &str) |
Deserialize a SkyWcs from a string, using the same format as readStream. More... | |
static std::shared_ptr< SkyWcs > | readFits (fits::Fits &fitsfile) |
Read an object from an already open FITS object. More... | |
static std::shared_ptr< SkyWcs > | readFits (std::string const &fileName, int hdu=fits::DEFAULT_HDU) |
Read an object from a regular FITS file. More... | |
static std::shared_ptr< SkyWcs > | readFits (fits::MemFileManager &manager, int hdu=fits::DEFAULT_HDU) |
Read an object from a FITS file in memory. More... | |
static std::shared_ptr< SkyWcs > | dynamicCast (std::shared_ptr< Persistable > const &ptr) |
Dynamically cast a shared_ptr. More... | |
Protected Types | |
using | OutputArchiveHandle = io::OutputArchiveHandle |
Protected Member Functions | |
std::string | getPersistenceName () const override |
Return the unique name used to persist this object and look up its factory. More... | |
std::string | getPythonModule () const override |
Return the fully-qualified Python module that should be imported to guarantee that its factory is registered. More... | |
void | write (OutputArchiveHandle &handle) const override |
Write the object to one or more catalogs. More... | |
Static Protected Member Functions | |
template<class T > | |
static bool | singleClassEquals (T const &lhs, Storable const &rhs) |
Test if a Storable is of a particular class and equal to another object. More... | |
Related Functions | |
(Note that these are not member functions.) | |
std::ostream & | operator<< (std::ostream &os, Storable const &storable) |
Output operator for Storable. More... | |
A 2-dimensional celestial WCS that transform pixels to ICRS RA/Dec, using the LSST standard for pixels.
SkyWcs is an immutable object that can not only represent any standard FITS WCS, but can also contain arbitrary Transforms, e.g. to model optical distortion or pixel imperfections.
In order to make a SkyWcs that models optical distortion, say, it is usually simplest to start with a standard FITS WCS (such as a TAN WCS) as an approximation, then insert a transform that models optical distortion by calling makeModifiedWcs. However, it is also possible to build a SkyWcs entirely from transforms, if you prefer, by building an ast::FrameDict and constructing the SkyWcs from that.
SkyWcs internally keeps track of the following frames of reference:
The LSST standard for pixel position is: 0,0 is the center of the lower left image pixel. The FITS standard for pixel position is: 1,1 is the center of the lower left image pixel.
LSST and FITS also use a different origin for subimages:
copyAtShiftedPixelOrigin
Internal details: the contained ast::FrameDict
SkyWcs contains an ast::FrameDict which transforms from pixels to sky (in radians) in the forward direction.
This FrameDict contains the named frames described in frames of reference, e.g. "SKY", "IWC", cameraGeom::PIXELS and possibly cameraGeom::ACTUAL_PIXELS. "SKY" is the current frame. If cameraGeom::ACTUAL_PIXELS is present then it is the base frame, otherwise cameraGeom::PIXELS is the base frame.
The "SKY" frame is of type ast::SkyFrame and has the following attributes:
SkyRef
is set to the sky origin of the WCS (ICRS RA, Dec) in radians.SkyRefIs
is set to "Ignored" so that SkyRef is not used in transformations.The other frames are of type ast::Frame and have 2 axes.
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protectedinherited |
Definition at line 108 of file Persistable.h.
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overridedefault |
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explicit |
Construct a SkyWcs from FITS keywords.
[in] | metadata | FITS header metadata |
[in] | strip | If true: strip items from metadata used to create the WCS, such as RADESYS, EQUINOX, CTYPE12, CRPIX12, CRVAL12, etc. Always keep keywords that might be wanted for other purpposes, including NAXIS12 and date-related keywords such as "DATE-OBS" and "TIMESYS" (but not "EQUINOX"). |
lsst::pex::exceptions::TypeError | if the metadata does not describe a celestial WCS. |
Definition at line 151 of file SkyWcs.cc.
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explicit |
Construct a SkyWcs from an ast::FrameDict.
This is the most general constructor; it can be used to define any celestial WCS. Note that in many cases the result will not be exactly representable as a FITS WCS.
[in] | frameDict | An ast::FrameDict that describes the transformation from pixels to sky. It must meet the requirements outlined in the contained ast::FrameDict. |
lsst::pex::exceptions::TypeError | if frameDict is missing any of the required frames of reference. |
Definition at line 154 of file SkyWcs.cc.
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overridevirtual |
Create a new SkyWcs that is a copy of this one.
Reimplemented from lsst::afw::typehandling::Storable.
std::shared_ptr< SkyWcs > lsst::afw::geom::SkyWcs::copyAtShiftedPixelOrigin | ( | lsst::geom::Extent2D const & | shift | ) | const |
Return a copy of this SkyWcs with the pixel origin shifted by the specified amount.
new pixel origin = the old pixel origin + shift
[in] | shift | The amount by which to shift the pixel origin (pixels) |
Definition at line 208 of file SkyWcs.cc.
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staticinherited |
Dynamically cast a shared_ptr.
Dynamically cast a shared pointer and raise on failure.
You must provide an explicit template instantiation in the .cc file for each class that inherits from PersistableFacade. Designed to work around RTTI issues on macOS with hidden symbols;
lsst::pex::exceptions::LogicError | if the cast fails |
param[in] ptr The pointer to be cast.
lsst::pex::exceptions::TypeError | If the dynamic cast fails. |
Definition at line 218 of file Persistable.cc.
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overridevirtualnoexcept |
Compare this object to another Storable.
*this == other
if other
is a SkyWcs; otherwise false
. Reimplemented from lsst::afw::typehandling::Storable.
Definition at line 373 of file SkyWcs.cc.
Eigen::Matrix2d lsst::afw::geom::SkyWcs::getCdMatrix | ( | ) | const |
Get the 2x2 CD matrix at the pixel origin.
The elements are in degrees
Definition at line 199 of file SkyWcs.cc.
Eigen::Matrix2d lsst::afw::geom::SkyWcs::getCdMatrix | ( | lsst::geom::Point2D const & | pixel | ) | const |
Get the 2x2 CD matrix at the specified pixel position.
The elements are in degrees
Definition at line 193 of file SkyWcs.cc.
std::shared_ptr< daf::base::PropertyList > lsst::afw::geom::SkyWcs::getFitsMetadata | ( | bool | precise = false | ) | const |
Return the WCS as FITS WCS metadata.
[in] | precise | Fail if the WCS cannot be accurately represented as FITS metadata? If False then return an approximation. For now that approximation is pure TAN but as of DM-13170 it will be a fit TAN-SIP. The required precision is set by constant TIGHT_FITS_TOL in SkyWcs.cc |
FITS representations of WCS are described in "Representations of World Coordinates in FITS" by Greisen and Calabretta and several related papers.
The required precision is hard-coded as constant TIGHT_FITS_TOL in SkyWcs.cc
lsst::pex::exceptions::RuntimeError | if precise is true and AST cannot represent this WCS as a FITS WCS to sufficient precision. |
Definition at line 213 of file SkyWcs.cc.
std::shared_ptr< const ast::FrameDict > lsst::afw::geom::SkyWcs::getFrameDict | ( | ) | const |
Get the contained FrameDict.
The base frame will be cameraGeom::PIXELS or cameraGeom::ACTUAL_PIXELS and the current frame will be SKY, so the forward transform goes from pixels (using the LSST zero convention) to sky ICRS RA, Dec (in radians). For more details see the contained ast::FrameDict
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overrideprotectedvirtual |
Return the unique name used to persist this object and look up its factory.
Must be less than ArchiveIndexSchema::MAX_NAME_LENGTH characters.
Reimplemented from lsst::afw::table::io::Persistable.
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lsst::geom::Angle lsst::afw::geom::SkyWcs::getPixelScale | ( | lsst::geom::Point2D const & | pixel | ) | const |
Get the pixel scale at the specified pixel position.
The scale is the square root of the area of the specified pixel on the sky.
Definition at line 158 of file SkyWcs.cc.
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overrideprotectedvirtual |
Return the fully-qualified Python module that should be imported to guarantee that its factory is registered.
Must be less than ArchiveIndexSchema::MAX_MODULE_LENGTH characters.
Will be ignored if empty.
Reimplemented from lsst::afw::table::io::Persistable.
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lsst::geom::SpherePoint lsst::afw::geom::SkyWcs::getSkyOrigin | ( | ) | const |
Get the sky origin, the celestial fiducial point.
This is CRVAL1, CRVAL2 in FITS terminology
Definition at line 182 of file SkyWcs.cc.
std::shared_ptr< SkyWcs > lsst::afw::geom::SkyWcs::getTanWcs | ( | lsst::geom::Point2D const & | pixel | ) | const |
Get a local TAN WCS approximation to this WCS at the specified pixel position.
Definition at line 201 of file SkyWcs.cc.
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inline |
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inline |
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virtualinherited |
Return a hash of this object (optional operation).
UnsupportedOperationException | Thrown if this object is not hashable. |
__hash__
if it exists. Reimplemented in lsst::afw::typehandling::StorableHelper< Base >, lsst::afw::image::VisitInfo, lsst::afw::image::FilterLabel, and lsst::afw::geom::polygon::Polygon.
Definition at line 44 of file Storable.cc.
bool lsst::afw::geom::SkyWcs::isFits | ( | ) | const |
Return true getFitsMetadata(true) will succeed, false if not.
In other words, true indicates that the WCS can be accurately represented using FITS WCS metadata.
Definition at line 264 of file SkyWcs.cc.
bool lsst::afw::geom::SkyWcs::isFlipped | ( | ) | const |
Does the WCS follow the convention of North=Up, East=Left?
lsst::pex::exceptions::RuntimeError | if the parity cannot be determined because the CD matrix is singular. |
Definition at line 296 of file SkyWcs.cc.
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inlineoverridevirtualnoexcept |
Return true if this particular object can be persisted using afw::table::io.
Reimplemented from lsst::afw::table::io::Persistable.
lsst::geom::AffineTransform lsst::afw::geom::SkyWcs::linearizePixelToSky | ( | lsst::geom::Point2D const & | pixel, |
lsst::geom::AngleUnit const & | skyUnit | ||
) | const |
Return the local linear approximation to pixelToSky at a point given in pixel coordinates.
The local linear approximation is defined such the following is true (ignoring floating-point errors):
wcs.linearizePixelToSky(pixel, skyUnit)(pixel) == wcs.pixelToSky(pixel).getPosition(skyUnit)
(lsst::geom::AffineTransform::operator() applies the transform in the forward direction)
[in] | pixel | Position in pixel coordinates where transform is desired. |
[in] | skyUnit | Units to use for sky coordinates; units of matrix elements will be skyUnits/pixel. |
lsst::geom::AffineTransform lsst::afw::geom::SkyWcs::linearizePixelToSky | ( | lsst::geom::SpherePoint const & | coord, |
lsst::geom::AngleUnit const & | skyUnit | ||
) | const |
Return the local linear approximation to pixelToSky at a point given in sky coordinates.
The local linear approximation is defined such the following is true (ignoring floating-point errors):
wcs.linearizePixelToSky(sky, skyUnit)(wcs.skyToPixel(sky)) == sky.getPosition(skyUnit);
(lsst::geom::AffineTransform::operator() applies the transform in the forward direction)
[in] | coord | Position in sky coordinates where transform is desired. |
[in] | skyUnit | Units to use for sky coordinates; units of matrix elements will be skyUnits/pixel. |
Definition at line 275 of file SkyWcs.cc.
lsst::geom::AffineTransform lsst::afw::geom::SkyWcs::linearizeSkyToPixel | ( | lsst::geom::Point2D const & | pixel, |
lsst::geom::AngleUnit const & | skyUnit | ||
) | const |
Return the local linear approximation to skyToPixel at a point given in pixel coordinates.
The local linear approximation is defined such the following is true (ignoring floating-point errors):
wcs.linearizeSkyToPixel(pixel, skyUnit)(wcs.pixelToSky(pixel).getPosition(skyUnit)) == pixel
(lsst::geom::AffineTransform::operator() applies the transform in the forward direction)
[in] | pixel | Position in pixel coordinates where transform is desired. |
[in] | skyUnit | Units to use for sky coordinates; units of matrix elements will be pixels/skyUnit. |
lsst::geom::AffineTransform lsst::afw::geom::SkyWcs::linearizeSkyToPixel | ( | lsst::geom::SpherePoint const & | coord, |
lsst::geom::AngleUnit const & | skyUnit | ||
) | const |
Return the local linear approximation to skyToPixel at a point given in sky coordinates.
The local linear approximation is defined such the following is true (ignoring floating-point errors):
wcs.linearizeSkyToPixel(sky, skyUnit)(sky.getPosition(skyUnit)) == wcs.skyToPixel(sky)
(lsst::geom::AffineTransform::operator() applies the transform in the forward direction)
[in] | coord | Position in sky coordinates where transform is desired. |
[in] | skyUnit | Units to use for sky coordinates; units of matrix elements will be pixels/skyUnit. |
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bool lsst::afw::geom::SkyWcs::operator== | ( | SkyWcs const & | other | ) | const |
Equality is based on the string representations being equal.
Two SkyWcs constructed the same way will be equal, and a SkyWcs that has been saved and restored will be equal to the original. However, it is possible to construct two SkyWcs that behave identically as far as transforming points go, but will compare as unequal due to subtle internal differences, such as a contained ast::Mapping that has a different ID in one SkyWcs than another.
Thus equality is primarily useful for testing persistence.
Definition at line 156 of file SkyWcs.cc.
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inlinestaticinherited |
Read an object from an already open FITS object.
[in] | fitsfile | FITS object to read from, already positioned at the desired HDU. |
Definition at line 183 of file Persistable.h.
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inlinestaticinherited |
Read an object from a FITS file in memory.
[in] | manager | Manager for the memory to read from. |
[in] | hdu | HDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty. |
Definition at line 205 of file Persistable.h.
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inlinestaticinherited |
Read an object from a regular FITS file.
[in] | fileName | Name of the file to read. |
[in] | hdu | HDU to read, where 0 is the primary. The special value of afw::fits::DEFAULT_HDU skips the primary HDU if it is empty. |
Definition at line 194 of file Persistable.h.
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static |
Deserialize a SkyWcs from an input stream.
[in] | is | input stream from which to deserialize this SkyWcs |
Definition at line 304 of file SkyWcs.cc.
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Deserialize a SkyWcs from a string, using the same format as readStream.
Definition at line 332 of file SkyWcs.cc.
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inlinestaticprotectedinherited |
Test if a Storable is of a particular class and equal to another object.
This method template simplifies implementations of equals that delegate to operator==
without supporting cross-class comparisons.
T | The class expected of the two objects to be compared. |
lhs,rhs | The objects to compare. Note that rhs need not be a T , while lhs must be. |
true
if rhs
is a T
and lhs == rhs
; false
otherwise.operator==
. Most implementations of operator==
do not throw.operator==
with both arguments of compile-time type T const&
. Its use is not recommended if there would be any ambiguity as to which operator==
gets picked by overload resolution.This method template is typically called from equals as:
bool MyType::equals(Storable const& other) const noexcept { return singleClassEquals(*this, other); }
Definition at line 151 of file Storable.h.
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overridevirtual |
Create a string representation of this object.
An example of the output might look like this (note the newlines):
FITS standard SkyWcs: Sky Origin: (0.000000, +45.000000) Pixel Origin: (100, 100) Pixel Scale: 1 arcsec/pixel
Reimplemented from lsst::afw::typehandling::Storable.
Definition at line 352 of file SkyWcs.cc.
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overrideprotectedvirtual |
Write the object to one or more catalogs.
The handle object passed to this function provides an interface for adding new catalogs and adding nested objects to the same archive (while checking for duplicates). See OutputArchiveHandle for more information.
Reimplemented from lsst::afw::table::io::Persistable.
Definition at line 381 of file SkyWcs.cc.
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inherited |
Write the object to an already-open FITS object.
[in] | fitsfile | Open FITS object to write to. |
Definition at line 18 of file Persistable.cc.
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inherited |
Write the object to a FITS image in memory.
[in] | manager | Name of the file to write to. |
[in] | mode | If "w", any existing file with the given name will be overwritten. If "a", new HDUs will be appended to an existing file. |
Definition at line 29 of file Persistable.cc.
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inherited |
Write the object to a regular FITS file.
[in] | fileName | Name of the file to write to. |
[in] | mode | If "w", any existing file with the given name will be overwritten. If "a", new HDUs will be appended to an existing file. |
Definition at line 24 of file Persistable.cc.
void lsst::afw::geom::SkyWcs::writeStream | ( | std::ostream & | os | ) | const |
Serialize this SkyWcs to an output stream.
Version 1 format is as follows:
If and when fits approximation is supported, the approximate WCS will be written as a second FrameDict immediately following the first.
[out] | os | output stream to which to serialize this SkyWcs |
Definition at line 337 of file SkyWcs.cc.
std::string lsst::afw::geom::SkyWcs::writeString | ( | ) | const |
Serialize this SkyWcs to a string, using the same format as writeStream.
Definition at line 342 of file SkyWcs.cc.
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related |
Output operator for Storable.
os | the desired output stream |
storable | the object to print |
os
UnsupportedOperationException | Thrown if storable does not have an implementation of Storable::toString. |
Definition at line 174 of file Storable.h.