Package org.opengis.referencing.operation

Interface OperationMethod

All Superinterfaces:

IdentifiedObject

@UML(identifier="CC_OperationMethod",
     specification=ISO_19111)
public interface OperationMethod
extends IdentifiedObject

Definition of an algorithm used to perform a coordinate operation. Most operation methods use a number of operation parameters, although some coordinate conversions use none. Each coordinate operation using the method assigns values to these parameters.

Example: An operation method named “Mercator (variant A)” (EPSG:9804) declares the following parameters:

• “Latitude of natural origin” in degrees.
• “Longitude of natural origin” in degrees.
• “Scale factor at natural origin” as a dimensionless number.
• “False easting” in metres.
• “False northing” in metres.

Implementations can optionally assign default values to those parameters.

Operation method identifiers are optional but recommended, since the method name is potentially ambiguous. Some recommended EPSG identifiers are reproduced below (see ISO 19162 or the EPSG registry for a more complete list):

EPSG identifier for some operation method names

Name	Alias	Identifier
Albers Equal Area	Albers	9822
Hotine Oblique Mercator (variant A)	Rectified skew orthomorphic	9812
Hotine Oblique Mercator (variant B)	Rectified skew orthomorphic	9815
Lambert Azimuthal Equal Area	Lambert Equal Area	9820
Lambert Conic Conformal (1SP)	Lambert Conic Conformal	9801
Lambert Conic Conformal (2SP)	Lambert Conic Conformal	9802
Mercator (variant A)	Mercator	9804
Mercator (variant B)	Mercator	9805
Oblique stereographic	Double stereographic	9809
Transverse Mercator	Gauss-Boaga / Gauss-Krüger	9807

Since:

1.0

See Also:

CoordinateOperation, MathTransformFactory.getAvailableMethods(Class), CoordinateOperationFactory.getOperationMethod(String), CoordinateOperationAuthorityFactory.createOperationMethod(String), CoordinateOperationFactory.createOperationMethod(Map, Integer, Integer, ParameterDescriptorGroup)

Field Summary

Fields

Modifier and Type	Field	Description
static String	FORMULA_KEY	Key for the "formula" property.

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Method Summary

Modifier and Type	Method	Description
Formula	getFormula()	Formula(s) or procedure used by this operation method.
ParameterDescriptorGroup	getParameters()	The set of parameters.
default Integer	getSourceDimensions()	Number of dimensions in the source CRS of this operation method.
default Integer	getTargetDimensions()	Number of dimensions in the target CRS of this operation method.

Methods inherited from interface IdentifiedObject

getAlias, getIdentifiers, getName, getRemarks, toWKT

Field Detail

FORMULA_KEY

static final String FORMULA_KEY

Key for the "formula" property. This is used for setting the value to be returned by getFormula().

See Also:

getFormula(), Constant Field Values

Method Detail

getFormula

@UML(identifier="formulaReference",
     obligation=MANDATORY,
     specification=ISO_19111)
Formula getFormula()

Formula(s) or procedure used by this operation method. This may be a reference to a publication. Note that the operation method may not be analytic, in which case this attribute references or contains the procedure, not an analytic formula.

Returns:

the formula used by this method.

getSourceDimensions

@UML(identifier="sourceDimensions",
     obligation=OPTIONAL,
     specification=ISO_19111)
default Integer getSourceDimensions()

Number of dimensions in the source CRS of this operation method. Note that some operation methods work with an arbitrary number of dimensions (e.g. Affine Transform) and may return null.

Returns:

the dimension of source CRS, or null if unknown.

See Also:

MathTransform.getSourceDimensions()

getTargetDimensions

@UML(identifier="targetDimensions",
     obligation=OPTIONAL,
     specification=ISO_19111)
default Integer getTargetDimensions()

Number of dimensions in the target CRS of this operation method. Note that some operation methods work with an arbitrary number of dimensions (e.g. Affine Transform) and may return null.

Returns:

the dimension of target CRS, or null if unknown.

See Also:

MathTransform.getTargetDimensions()

getParameters

@UML(identifier="parameter",
     obligation=MANDATORY,
     specification=ISO_19111)
ParameterDescriptorGroup getParameters()

The set of parameters.

Returns:

the parameters, or an empty group if none.