Class: QgsProjectionFactors

class qgis.core.QgsProjectionFactors

Bases: sip.wrapper

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

Methods

angularDistortion

Angular distortion at coordinate (λ,ϕ).

arealScale

Areal scale factor at coordinate (λ,ϕ).

dxDlam

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

dxDphi

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

dyDlam

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

dyDphi

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

isValid

Returns True if the factors are valid, or False if they could not be calculated.

meridianConvergence

Meridian convergence (in degrees) at coordinate (λ,ϕ).

meridianParallelAngle

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

meridionalScale

Meridional scale at coordinate (λ,ϕ).

parallelScale

Parallel scale at coordinate (λ,ϕ).

tissotSemimajor

Maximum scale factor.

tissotSemiminor

Minimum scale factor.

angularDistortion(self)float

Angular distortion at coordinate (λ,ϕ).

Return type

float

arealScale(self)float

Areal scale factor at coordinate (λ,ϕ).

Return type

float

dxDlam(self)float

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

Return type

float

dxDphi(self)float

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

Return type

float

dyDlam(self)float

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

Return type

float

dyDphi(self)float

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

Return type

float

isValid(self)bool

Returns True if the factors are valid, or False if they could not be calculated.

Return type

bool

meridianConvergence(self)float

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

Return type

float

meridianParallelAngle(self)float

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

Return type

float

meridionalScale(self)float

Meridional scale at coordinate (λ,ϕ).

Return type

float

parallelScale(self)float

Parallel scale at coordinate (λ,ϕ).

Return type

float

tissotSemimajor(self)float

Maximum scale factor.

Return type

float

tissotSemiminor(self)float

Minimum scale factor.

Return type

float