QgsCoordinateReferenceSystemRegistry Class Reference

A registry for known coordinate reference system (CRS) definitions, including any user-defined CRSes. More...

#include <qgscoordinatereferencesystemregistry.h>

Inheritance diagram for QgsCoordinateReferenceSystemRegistry:

Classes
class	UserCrsDetails
	Contains details of a custom (user defined) CRS. More...

Signals
void	crsDefinitionsChanged ()
	Emitted whenever an operation has caused any of the known CRS definitions (including user-defined CRS) to change.
void	userCrsAdded (const QString &id)
	Emitted whenever a new user CRS definition is added.
void	userCrsChanged (const QString &id)
	Emitted whenever an existing user CRS definition is changed.
void	userCrsRemoved (long id)
	Emitted when the user CRS with matching id is removed from the database.

Public Member Functions
	QgsCoordinateReferenceSystemRegistry (QObject *parent=nullptr)
	Constructor for QgsCoordinateReferenceSystemRegistry, with the specified parent object.
	~QgsCoordinateReferenceSystemRegistry ()
long	addUserCrs (const QgsCoordinateReferenceSystem &crs, const QString &name, Qgis::CrsDefinitionFormat nativeFormat=Qgis::CrsDefinitionFormat::Wkt)
	Adds a new crs definition as a custom ("USER") CRS.
QSet< QString >	authorities () const
	Returns a list of all known authorities.
QList< QgsCelestialBody >	celestialBodies () const
	Returns a list of all known celestial bodies.
QList< QgsCrsDbRecord >	crsDbRecords () const
	Returns the list of records from the QGIS srs db.
QMap< QString, QgsProjOperation >	projOperations () const
	Returns a map of all valid PROJ operations.
bool	removeUserCrs (long id)
	Removes the existing user CRS with matching id.
bool	updateUserCrs (long id, const QgsCoordinateReferenceSystem &crs, const QString &name, Qgis::CrsDefinitionFormat nativeFormat=Qgis::CrsDefinitionFormat::Wkt)
	Updates the definition of the existing user CRS with matching id.
QList< QgsCoordinateReferenceSystemRegistry::UserCrsDetails >	userCrsList () const
	Returns a list containing the details of all registered custom (user-defined) CRSes.

Detailed Description

A registry for known coordinate reference system (CRS) definitions, including any user-defined CRSes.

QgsCoordinateReferenceSystemRegistry is not usually directly created, but rather accessed through QgsApplication::coordinateReferenceSystemRegistry().

Since

QGIS 3.18

Definition at line 64 of file qgscoordinatereferencesystemregistry.h.

Constructor & Destructor Documentation

QgsCoordinateReferenceSystemRegistry()

QgsCoordinateReferenceSystemRegistry::QgsCoordinateReferenceSystemRegistry ( QObject *  parent = nullptr )

explicit

Constructor for QgsCoordinateReferenceSystemRegistry, with the specified parent object.

Definition at line 36 of file qgscoordinatereferencesystemregistry.cpp.

~QgsCoordinateReferenceSystemRegistry()

QgsCoordinateReferenceSystemRegistry::~QgsCoordinateReferenceSystemRegistry ( )

default

Member Function Documentation

addUserCrs()

long QgsCoordinateReferenceSystemRegistry::addUserCrs	(	const QgsCoordinateReferenceSystem &	crs,
		const QString &	name,
		Qgis::CrsDefinitionFormat	nativeFormat = Qgis::CrsDefinitionFormat::Wkt
	)

Adds a new crs definition as a custom ("USER") CRS.

Returns the new CRS srsid(), or -1 if the CRS could not be saved.

The nativeFormat argument specifies the format to use when saving the CRS definition. FormatWkt is recommended as it is a lossless format.

Warning

Not all CRS definitions can be represented as a Proj string, so take care when using the FormatProj option.

See also

updateUserCrs()

userCrsAdded()

Definition at line 83 of file qgscoordinatereferencesystemregistry.cpp.

authorities()

QSet< QString > QgsCoordinateReferenceSystemRegistry::authorities

(

)

const

Returns a list of all known authorities.

Note

authority names will always be returned in lower case

Since

QGIS 3.34

Definition at line 414 of file qgscoordinatereferencesystemregistry.cpp.

celestialBodies()

QList< QgsCelestialBody > QgsCoordinateReferenceSystemRegistry::celestialBodies

(

)

const

Returns a list of all known celestial bodies.

Warning

This method requires PROJ 8.1 or later

Exceptions

QgsNotSupportedException

on QGIS builds based on PROJ 8.0 or earlier.

Since

QGIS 3.20

Definition at line 378 of file qgscoordinatereferencesystemregistry.cpp.

crsDbRecords()

QList< QgsCrsDbRecord > QgsCoordinateReferenceSystemRegistry::crsDbRecords

(

)

const

Returns the list of records from the QGIS srs db.

Note

Not available in Python bindings

Since

QGIS 3.34

Definition at line 436 of file qgscoordinatereferencesystemregistry.cpp.

crsDefinitionsChanged

void QgsCoordinateReferenceSystemRegistry::crsDefinitionsChanged ( )

signal

Emitted whenever an operation has caused any of the known CRS definitions (including user-defined CRS) to change.

projOperations()

QMap< QString, QgsProjOperation > QgsCoordinateReferenceSystemRegistry::projOperations

(

)

const

Returns a map of all valid PROJ operations.

The map keys correspond to PROJ operation IDs.

Since

QGIS 3.20

Definition at line 350 of file qgscoordinatereferencesystemregistry.cpp.

removeUserCrs()

bool QgsCoordinateReferenceSystemRegistry::removeUserCrs

(

long

id

)

Removes the existing user CRS with matching id.

Returns false if the CRS could not be removed.

See also

userCrsRemoved()

Definition at line 245 of file qgscoordinatereferencesystemregistry.cpp.

updateUserCrs()

bool QgsCoordinateReferenceSystemRegistry::updateUserCrs	(	long	id,
		const QgsCoordinateReferenceSystem &	crs,
		const QString &	name,
		Qgis::CrsDefinitionFormat	nativeFormat = Qgis::CrsDefinitionFormat::Wkt
	)

Updates the definition of the existing user CRS with matching id.

The crs argument specifies a CRS with the desired new definition.

Returns false if the new CRS definition could not be saved.

The nativeFormat argument specifies the format to use when saving the CRS definition. FormatWkt is recommended as it is a lossless format.

Warning

Not all CRS definitions can be represented as a Proj string, so take care when using the FormatProj option.

See also

addUserCrs()

userCrsChanged()

Definition at line 175 of file qgscoordinatereferencesystemregistry.cpp.

userCrsAdded

void QgsCoordinateReferenceSystemRegistry::userCrsAdded ( const QString &  id )

signal

Emitted whenever a new user CRS definition is added.

The id argument specifies the ID of the user CRS which has been changed.

See also

userCrsChanged()

crsDefinitionsChanged()

userCrsChanged

void QgsCoordinateReferenceSystemRegistry::userCrsChanged ( const QString &  id )

signal

Emitted whenever an existing user CRS definition is changed.

The id argument specifies the ID of the user CRS which has been changed.

Objects which store QgsCoordinateReferenceSystem members should connect to this signal and update any stored CRS definitions to ensure that they always use the current definition of any user defined CRSes.

See also

crsDefinitionsChanged()

userCrsAdded()

userCrsList()

QList< QgsCoordinateReferenceSystemRegistry::UserCrsDetails > QgsCoordinateReferenceSystemRegistry::userCrsList

(

)

const

Returns a list containing the details of all registered custom (user-defined) CRSes.

Definition at line 44 of file qgscoordinatereferencesystemregistry.cpp.

userCrsRemoved

void QgsCoordinateReferenceSystemRegistry::userCrsRemoved ( long  id )

signal

Emitted when the user CRS with matching id is removed from the database.

See also

removeUserCrs()

---

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

• /build/qgis-3.34.0+99sid/src/core/proj/qgscoordinatereferencesystemregistry.h
• /build/qgis-3.34.0+99sid/src/core/proj/qgscoordinatereferencesystemregistry.cpp