QGIS API Documentation 3.39.0-Master (bca3cdb6021)
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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). | |
double | arealScale () const |
Areal scale factor at coordinate (λ,ϕ). | |
double | dxDlam () const |
Partial derivative ∂x/∂λ of coordinate (λ,ϕ). | |
double | dxDphi () const |
Partial derivative ∂x/∂ϕ of coordinate (λ,ϕ). | |
double | dyDlam () const |
Partial derivative ∂y/∂λ of coordinate (λ,ϕ). | |
double | dyDphi () const |
Partial derivative ∂y/∂ϕ of coordinate (λ,ϕ). | |
bool | isValid () const |
Returns true if the factors are valid, or false if they could not be calculated. | |
double | meridianConvergence () const |
Meridian convergence (in degrees) at coordinate (λ,ϕ). Sometimes also described as grid declination. | |
double | meridianParallelAngle () const |
Meridian/parallel angle (in degrees), θ′, at coordinate (λ,ϕ). | |
double | meridionalScale () const |
Meridional scale at coordinate (λ,ϕ). | |
double | parallelScale () const |
Parallel scale at coordinate (λ,ϕ). | |
double | tissotSemimajor () const |
Maximum scale factor. | |
double | tissotSemiminor () const |
Minimum scale factor. | |
Friends | |
class | QgsCoordinateReferenceSystem |
contains various cartographic properties, such as scale factors, angular distortion and meridian convergence.
Definition at line 30 of file qgsprojectionfactors.h.
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Angular distortion at coordinate (λ,ϕ).
Definition at line 49 of file qgsprojectionfactors.h.
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Areal scale factor at coordinate (λ,ϕ).
Definition at line 46 of file qgsprojectionfactors.h.
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Partial derivative ∂x/∂λ of coordinate (λ,ϕ).
Definition at line 64 of file qgsprojectionfactors.h.
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Partial derivative ∂x/∂ϕ of coordinate (λ,ϕ).
Definition at line 67 of file qgsprojectionfactors.h.
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inline |
Partial derivative ∂y/∂λ of coordinate (λ,ϕ).
Definition at line 70 of file qgsprojectionfactors.h.
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Partial derivative ∂y/∂ϕ of coordinate (λ,ϕ).
Definition at line 73 of file qgsprojectionfactors.h.
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Returns true
if the factors are valid, or false
if they could not be calculated.
Definition at line 37 of file qgsprojectionfactors.h.
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Meridian convergence (in degrees) at coordinate (λ,ϕ). Sometimes also described as grid declination.
Definition at line 55 of file qgsprojectionfactors.h.
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Meridian/parallel angle (in degrees), θ′, at coordinate (λ,ϕ).
Definition at line 52 of file qgsprojectionfactors.h.
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Meridional scale at coordinate (λ,ϕ).
Definition at line 40 of file qgsprojectionfactors.h.
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Parallel scale at coordinate (λ,ϕ).
Definition at line 43 of file qgsprojectionfactors.h.
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Maximum scale factor.
Definition at line 58 of file qgsprojectionfactors.h.
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Minimum scale factor.
Definition at line 61 of file qgsprojectionfactors.h.
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Definition at line 107 of file qgsprojectionfactors.h.