Class Hierarchy

The proj4rb class hierarchy is based on Proj's class hierarchy, which is derived from the OGC Abstract Specification.

classDiagram
    PjObject <|-- Conversion
    PjObject <|-- Transformation
    PjObject <|-- CoordinateMetadata
    PjObject <|-- CoordinateSystem
    PjObject <|-- Crs
    PjObject <|-- Datum
    PjObject <|-- DatumEnsemble
    PjObject <|-- Ellipsoid
    PjObject <|-- PrimeMeridian

    CoordinateOperationMixin <|.. Conversion
    CoordinateOperationMixin <|.. Transformation

    class PjObject {
        +create()
        +create_from_database()
        +create_from_name()
        +create_from_wkt()
    }

    class CoordinateOperationMixin {
        <<module>>
        +forward(coord)
        +inverse(coord)
        +transform_bounds(bounds)
    }

    class Context {
        +database
        +network_enabled
        +log_level
    }

    PjObject --> Context

PjObject Properties

All PjObject subclasses expose common metadata:

crs = Proj::Crs.new('EPSG:4326')

crs.name          #=> "WGS 84"
crs.auth_name     #=> "EPSG"
crs.id_code       #=> "4326"
crs.auth          #=> "EPSG:4326"
crs.proj_type     #=> :PJ_TYPE_GEOGRAPHIC_2D_CRS
crs.remarks
crs.scope
crs.deprecated?   #=> false

area = crs.area_of_use
area.name
area.west_lon_degree
area.south_lat_degree
area.east_lon_degree
area.north_lat_degree

Supporting Classes

Area, Bounds, Bounds3d, Coordinate, Context, Database, GridCache, Operation, OperationFactoryContext, Parameter, Session, Unit