Package org.apache.sis.referencing.operation.projection

Class ModifiedAzimuthalEquidistant

Object

FormattableObject

AbstractMathTransform

AbstractMathTransform2D

NormalizedProjection

AzimuthalEquidistant

ModifiedAzimuthalEquidistant

All Implemented Interfaces:

Serializable, Parameterized, Lenient­Comparable, Math­Transform, Math­Transform2D

public class ModifiedAzimuthalEquidistant
extends AzimuthalEquidistant

Modified Azimuthal Equidistant projection (EPSG:9832). This is an approximation of the oblique form of the Azimuthal Equidistant projection. For distances under 800 kilometres this modification introduces no significant error.

Limitation

This class does not support derivative (Jacobian matrix) yet. See SIS-237 on issues tracker.

Since:

1.1

See Also:

• Azimuthal­Equidistant
• Serialized Form

Defined in the sis-referencing module

TODO:

Add Jacobian matrix formulas.

Nested Class Summary

Nested classes/interfaces inherited from class NormalizedProjection

Normalized­Projection.Parameter­Role

Field Summary

Fields inherited from class NormalizedProjection

eccentricity, eccentricity­Squared

Constructor Summary

Constructors

Constructor	Description
Modified­Azimuthal­Equidistant(Operation­Method method, Parameters parameters)	Creates a Modified Azimuthal Equidistant projection from the given parameters.

Method Summary

Modifier and Type	Method	Description
Math­Transform	create­Map­Projection(Math­Transform­Factory factory)	Returns the sequence of normalization → this → denormalization transforms as a whole.
protected void	inverse­Transform(double[] src­Pts, int src­Off, double[] dst­Pts, int dst­Off)	Converts the specified (x,y) coordinates and stores the result in dst­Pts (angles in radians).
Matrix	transform(double[] src­Pts, int src­Off, double[] dst­Pts, int dst­Off, boolean derivate)	Converts the specified (λ,φ) coordinate and stores the (x,y) result in dst­Pts.

Methods inherited from class NormalizedProjection

compute­Hash­Code, equals, get­Contextual­Parameters, get­Parameter­Descriptors, get­Parameter­Values, inverse, try­Concatenate

Methods inherited from class AbstractMathTransform2D

create­Transformed­Shape, derivative, get­Source­Dimensions, get­Target­Dimensions, transform

Methods inherited from class AbstractMathTransform

derivative, equals, format­To, hash­Code, is­Identity, transform, transform, transform, transform, transform

Methods inherited from class FormattableObject

print, to­String, to­String, to­WKT

Methods inherited from class Object

clone, finalize, get­Class, notify, notify­All, wait, wait, wait

Methods inherited from interface MathTransform

derivative, is­Identity, to­WKT, transform, transform, transform, transform, transform

Constructor Details

ModifiedAzimuthalEquidistant

public ModifiedAzimuthalEquidistant(OperationMethod method,
 Parameters parameters)

Creates a Modified Azimuthal Equidistant projection from the given parameters. The method argument can be the description of one of the following:

• "Modified Azimuthal Equidistant".

Parameters:

method - description of the projection parameters.

parameters - the parameter values of the projection to create.

Method Details

createMapProjection

public MathTransform createMapProjection(MathTransformFactory factory)
                                  throws FactoryException

Returns the sequence of normalization → this → denormalization transforms as a whole. The transform returned by this method expects (longitude, latitude) coordinates in degrees and returns (x,y) coordinates in metres.

The non-linear part of the returned transform will be this transform, except if the ellipsoid is spherical. In the later case, this transform will be replaced by a simplified implementation.

Overrides:

create­Map­Projection in class Normalized­Projection

Parameters:

factory - the factory to use for creating the transform.

Returns:

the map projection from (λ,φ) to (x,y) coordinates.

Throws:

Factory­Exception - if an error occurred while creating a transform.

See Also:

• Contextual­Parameters.complete­Transform(Math­Transform­Factory, Math­Transform)

transform

public Matrix transform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff,
 boolean derivate)
                 throws ProjectionException

Converts the specified (λ,φ) coordinate and stores the (x,y) result in dst­Pts.

Overrides:

transform in class Azimuthal­Equidistant

Parameters:

src­Pts - source point coordinate, as (longitude, latitude) in radians.

src­Off - the offset of the single coordinate to be converted in the source array.

dst­Pts - the array into which the converted coordinate is returned (may be the same than src­Pts).

dst­Off - the offset of the location of the converted coordinate that is stored in the destination array.

derivate - true for computing the derivative, or false if not needed.

Returns:

the matrix of the projection derivative at the given source position, or null if the derivate argument is false.

Throws:

Projection­Exception - if the coordinate can not be converted.

See Also:

• Abstract­Math­Transform.derivative(Direct­Position)
• Abstract­Math­Transform.transform(Direct­Position, Direct­Position)
• Math­Transforms.derivative­And­Transform(Math­Transform, double[], int, double[], int)

inverseTransform

protected void inverseTransform(double[] srcPts,
 int srcOff,
 double[] dstPts,
 int dstOff)
                         throws ProjectionException

Converts the specified (x,y) coordinates and stores the result in dst­Pts (angles in radians).

Overrides:

inverse­Transform in class Azimuthal­Equidistant

Parameters:

src­Pts - the array containing the source point coordinate, as linear distance on a unit sphere or ellipse.

src­Off - the offset of the point to be converted in the source array.

dst­Pts - the array into which the converted point coordinate is returned (may be the same than src­Pts).

dst­Off - the offset of the location of the converted point that is stored in the destination array.

Throws:

Projection­Exception - if the point can not be converted.