GeneralDerivedCRS (GeoAPI normative 3.1-SNAPSHOT)

All Superinterfaces:

CoordinateReferenceSystem, IdentifiedObject, ReferenceSystem, SingleCRS

All Known Subinterfaces:

DerivedCRS, ProjectedCRS
```
@Classifier(ABSTRACT)
@UML(identifier="SC_GeneralDerivedCRS",
     specification=ISO_19111)
public interface GeneralDerivedCRS
extends SingleCRS
```
A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system. Derived CRS are not directly associated to a datum.
In principle, all sub-types of CoordinateReferenceSystem may take on the role of either source or derived CRS with the exception of a GeocentricCRS and a ProjectedCRS. The latter is modelled as an object class under its own name, rather than as a general derived CRS of type "projected". This has been done to honour common practice, which acknowledges projected CRSs as one of the best known types of coordinate reference systems.

Since:

1.0

Field Summary
- Fields inherited from interface IdentifiedObject
  ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
- Fields inherited from interface ReferenceSystem
  DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY

Method Summary

Modifier and Type	Method	Description
`CoordinateReferenceSystem`	`getBaseCRS()`	Returns the base coordinate reference system.
`Conversion`	`getConversionFromBase()`	Returns the conversion from the base CRS to this CRS.

Methods inherited from interface IdentifiedObject
getAlias, getIdentifiers, getName, getRemarks, toWKT

Methods inherited from interface ReferenceSystem
getDomainOfValidity, getScope

Methods inherited from interface SingleCRS
getCoordinateSystem, getDatum

- Method Detail
  - getBaseCRS
```
@UML(identifier="baseCRS",
     obligation=MANDATORY,
     specification=ISO_19111)
CoordinateReferenceSystem getBaseCRS()
```
    Returns the base coordinate reference system.
    Upcoming API change — specialization
    According ISO 19111, the return type should be SingleCRS. This change may be applied in GeoAPI 4.0.
    
    Returns:
    
    the base coordinate reference system.
  - getConversionFromBase
```
@UML(identifier="conversion",
     obligation=MANDATORY,
     specification=ISO_19111)
Conversion getConversionFromBase()
```
    Returns the conversion from the base CRS to this CRS.
    
    Returns:
    
    the conversion from the base CRS.
    
    Departure from OGC/ISO specification:
    "conversion" may be confusing as a method name since it does not indicate which CRS is the source or which is the target. The OGC 01-009 specification used the toBase() method name. By analogy with 01-009, GeoAPI defines a method name which contains the "FromBase" expression.