API Reference › core-common› Geometry › Projection

Projection Class

This class encapsulates the projection of the CRS. The projection relies on a projection method and a set of projection parameters specific to projection method selected to flatten the surface of the model of the Earth defines as a geodetic ellipsoid. The flattening and the distortion angular, linear, scale from the process varies between methods. Refer to appropriate external documentation for details.

@note Various property sets are required for specific projection methods. The current class implementation does not enforce these rules yet and it is possible to define or not define any property regardless the method used.

Implements

Methods

Name Description
constructor(_data?: ProjectionProps): Projection    
equals(other: Projection): boolean Compares two projections.  
toJSON(): ProjectionProps Creates a JSON from the Projection definition  
fromJSON(data: ProjectionProps): Projection Static Creates a Projection from JSON representation.  

Properties

Name Type Description
affine Readonly AffineTransform | undefined The definition of the affine post-transformation for Transverse Mercator and Lambert Conformal Conic with post-affine projections  
azimuth Readonly number | undefined Azimuth.  
centralMeridian Readonly number | undefined The Central Meridian.  
centralPointLatitude Readonly number | undefined Latitude of the central point.  
centralPointLongitude Readonly number | undefined Longitude of the central point.  
danishSystem34Region Readonly DanishSystem34Region | undefined The Danish zone for Danish projections.  
elevationAboveGeoid Readonly number | undefined The elevation of the origin of the projection above the geoid.  
falseEasting Readonly number | undefined The False Easting of the projection.  
falseNorthing Readonly number | undefined The False Northing of the projection.  
geoidSeparation Readonly number | undefined The geoid separation.  
hemisphere Readonly HemisphereEnum | undefined The hemisphere for Universal Transverse Mercator projection.  
latitudeOfOrigin Readonly number | undefined The latitude of origin of the projection.  
longitudeOfOrigin Readonly number | undefined Longitude of origin of the projection.  
method Readonly ProjectionMethod The projection method.  
point1Latitude Readonly number | undefined Latitude of the first alignment point for some Oblique Mercator and Krovak projections.  
point1Longitude Readonly number | undefined Longitude of the first alignment point for some Oblique Mercator and Krovak projections.  
point2Latitude Readonly number | undefined Latitude of the second alignment point for some Oblique Mercator projections.  
point2Longitude Readonly number | undefined Longitude of the second alignment point for some Oblique Mercator projections.  
scaleFactor Readonly number | undefined The scale reduction factor applied at origin.  
standardParallel Readonly number | undefined Standard parallel for projection that only use one.  
standardParallel1 Readonly number | undefined The first standard parallel at which the cone crosses the ellipsoid.  
standardParallel2 Readonly number | undefined The second standard parallel at which the cone crosses the ellipsoid.  
zoneNumber Readonly number | undefined The UTM zone number.  

Defined in

Last Updated: 21 November, 2024