Class: QgsProjectionFactors¶
Contains various cartographic properties, such as scale factors, angular distortion and meridian convergence.
Added in version 3.20.
Methods
Angular distortion at coordinate (λ,ϕ). |
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Areal scale factor at coordinate (λ,ϕ). |
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Partial derivative ∂x/∂λ of coordinate (λ,ϕ). |
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Partial derivative ∂x/∂ϕ of coordinate (λ,ϕ). |
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Partial derivative ∂y/∂λ of coordinate (λ,ϕ). |
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Partial derivative ∂y/∂ϕ of coordinate (λ,ϕ). |
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Returns |
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Meridian convergence (in degrees) at coordinate (λ,ϕ). |
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Meridian/parallel angle (in degrees), θ′, at coordinate (λ,ϕ). |
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Meridional scale at coordinate (λ,ϕ). |
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Parallel scale at coordinate (λ,ϕ). |
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Maximum scale factor. |
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Minimum scale factor. |
- class qgis.core.QgsProjectionFactors[source]¶
Bases:
object
- isValid(self) bool [source]¶
Returns
True
if the factors are valid, orFalse
if they could not be calculated.- Return type:
bool
- meridianConvergence(self) float [source]¶
Meridian convergence (in degrees) at coordinate (λ,ϕ). Sometimes also described as grid declination.
- Return type:
float