QGIS API Documentation 3.37.0-Master (fdefdf9c27f)
QgsProjectionFactors Class Reference

contains various cartographic properties, such as scale factors, angular distortion and meridian convergence. More...

`#include <qgsprojectionfactors.h>`

Public Member Functions

double angularDistortion () const
Angular distortion at coordinate (λ,ϕ). More...

double arealScale () const
Areal scale factor at coordinate (λ,ϕ). More...

double dxDlam () const
Partial derivative ∂x/∂λ of coordinate (λ,ϕ). More...

double dxDphi () const
Partial derivative ∂x/∂ϕ of coordinate (λ,ϕ). More...

double dyDlam () const
Partial derivative ∂y/∂λ of coordinate (λ,ϕ). More...

double dyDphi () const
Partial derivative ∂y/∂ϕ of coordinate (λ,ϕ). More...

bool isValid () const
Returns `true` if the factors are valid, or `false` if they could not be calculated. More...

double meridianConvergence () const
Meridian convergence (in degrees) at coordinate (λ,ϕ). Sometimes also described as grid declination. More...

double meridianParallelAngle () const
Meridian/parallel angle (in degrees), θ′, at coordinate (λ,ϕ). More...

double meridionalScale () const
Meridional scale at coordinate (λ,ϕ). More...

double parallelScale () const
Parallel scale at coordinate (λ,ϕ). More...

double tissotSemimajor () const
Maximum scale factor. More...

double tissotSemiminor () const
Minimum scale factor. More...

Friends

class QgsCoordinateReferenceSystem

Detailed Description

contains various cartographic properties, such as scale factors, angular distortion and meridian convergence.

Since
QGIS 3.20

Definition at line 30 of file qgsprojectionfactors.h.

◆ angularDistortion()

 double QgsProjectionFactors::angularDistortion ( ) const
inline

Angular distortion at coordinate (λ,ϕ).

Definition at line 49 of file qgsprojectionfactors.h.

◆ arealScale()

 double QgsProjectionFactors::arealScale ( ) const
inline

Areal scale factor at coordinate (λ,ϕ).

Definition at line 46 of file qgsprojectionfactors.h.

◆ dxDlam()

 double QgsProjectionFactors::dxDlam ( ) const
inline

Partial derivative ∂x/∂λ of coordinate (λ,ϕ).

Definition at line 64 of file qgsprojectionfactors.h.

◆ dxDphi()

 double QgsProjectionFactors::dxDphi ( ) const
inline

Partial derivative ∂x/∂ϕ of coordinate (λ,ϕ).

Definition at line 67 of file qgsprojectionfactors.h.

◆ dyDlam()

 double QgsProjectionFactors::dyDlam ( ) const
inline

Partial derivative ∂y/∂λ of coordinate (λ,ϕ).

Definition at line 70 of file qgsprojectionfactors.h.

◆ dyDphi()

 double QgsProjectionFactors::dyDphi ( ) const
inline

Partial derivative ∂y/∂ϕ of coordinate (λ,ϕ).

Definition at line 73 of file qgsprojectionfactors.h.

◆ isValid()

 bool QgsProjectionFactors::isValid ( ) const
inline

Returns `true` if the factors are valid, or `false` if they could not be calculated.

Definition at line 37 of file qgsprojectionfactors.h.

◆ meridianConvergence()

 double QgsProjectionFactors::meridianConvergence ( ) const
inline

Meridian convergence (in degrees) at coordinate (λ,ϕ). Sometimes also described as grid declination.

Definition at line 55 of file qgsprojectionfactors.h.

◆ meridianParallelAngle()

 double QgsProjectionFactors::meridianParallelAngle ( ) const
inline

Meridian/parallel angle (in degrees), θ′, at coordinate (λ,ϕ).

Definition at line 52 of file qgsprojectionfactors.h.

◆ meridionalScale()

 double QgsProjectionFactors::meridionalScale ( ) const
inline

Meridional scale at coordinate (λ,ϕ).

Definition at line 40 of file qgsprojectionfactors.h.

◆ parallelScale()

 double QgsProjectionFactors::parallelScale ( ) const
inline

Parallel scale at coordinate (λ,ϕ).

Definition at line 43 of file qgsprojectionfactors.h.

◆ tissotSemimajor()

 double QgsProjectionFactors::tissotSemimajor ( ) const
inline

Maximum scale factor.

Definition at line 58 of file qgsprojectionfactors.h.

◆ tissotSemiminor()

 double QgsProjectionFactors::tissotSemiminor ( ) const
inline

Minimum scale factor.

Definition at line 61 of file qgsprojectionfactors.h.

◆ QgsCoordinateReferenceSystem

 friend class QgsCoordinateReferenceSystem
friend

Definition at line 107 of file qgsprojectionfactors.h.

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