Class CylindricalEqualArea
- Object
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- FormattableObject
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- AbstractMathTransform
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- AbstractMathTransform2D
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- NormalizedProjection
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- CylindricalEqualArea
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- All Implemented Interfaces:
Serializable
,Parameterized
,LenientComparable
,MathTransform
,MathTransform2D
public class CylindricalEqualArea extends NormalizedProjection
Cylindrical Equal Area projection (EPSG codes 9834, 9835). This is the simplest equal-area projection. This projection has various names depending on its standard parallel:Non-exhaustive list of variants Name Standard parallel Lambert cylindrical equal-area 0° Behrmann cylindrical equal-area 30° Gall orthographic 45° Balthasart 50° DescriptionThe parallels and the meridians are straight lines and cross at right angles. The scale is true along standard parallels, but distortion increase greatly at other locations. Distortions are so great that there is little use of this projection for world mapping purposes. However this projection may be useful for computing areas.- Since:
- 0.8
- See Also:
- Serialized Form
Defined in the
sis-referencing
module
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Nested Class Summary
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Nested classes/interfaces inherited from class NormalizedProjection
NormalizedProjection.ParameterRole
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Field Summary
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Fields inherited from class NormalizedProjection
eccentricity, eccentricitySquared
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Constructor Summary
Constructors Constructor Description CylindricalEqualArea(OperationMethod method, Parameters parameters)
Creates a Cylindrical Equal Area projection from the given parameters.
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Method Summary
All Methods Instance Methods Concrete Methods 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 indstPts
(angles in radians).Matrix
transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, boolean derivate)
Converts the specified (λ,φ) coordinate (units in radians) and stores the result indstPts
(linear distance on a unit sphere).void
transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts)
Converts a list of coordinate points.-
Methods inherited from class NormalizedProjection
computeHashCode, equals, getContextualParameters, getParameterDescriptors, getParameterValues, inverse, tryConcatenate
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Methods inherited from class AbstractMathTransform2D
createTransformedShape, derivative, getSourceDimensions, getTargetDimensions, transform
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Methods inherited from class AbstractMathTransform
derivative, equals, formatTo, hashCode, isIdentity, transform, transform, transform, transform
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Methods inherited from class FormattableObject
print, toString, toString, toWKT
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Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface MathTransform
derivative, isIdentity, toWKT, transform, transform, transform, transform
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Constructor Detail
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CylindricalEqualArea
public CylindricalEqualArea(OperationMethod method, Parameters parameters)
Creates a Cylindrical Equal Area projection from the given parameters.- Parameters:
method
- Description of the projection parameters.parameters
- The parameter values of the projection to create.
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Method Detail
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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 classNormalizedProjection
- 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)
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transform
public Matrix transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, boolean derivate) throws ProjectionException
Converts the specified (λ,φ) coordinate (units in radians) and stores the result indstPts
(linear distance on a unit sphere). In addition, opportunistically computes the projection derivative ifderivate
istrue
.- Specified by:
transform
in classNormalizedProjection
- Parameters:
srcPts
- the array containing the source point coordinate, as (longitude, latitude) angles 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 thansrcPts
). Coordinates will be expressed in a dimensionless unit, as a linear distance on a unit sphere or ellipse.dstOff
- the offset of the location of the converted coordinate that is stored in the destination array.derivate
-true
for computing the derivative, orfalse
if not needed.- Returns:
- the matrix of the projection derivative at the given source position,
or
null
if thederivate
argument isfalse
. - 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)
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transform
public void transform(double[] srcPts, int srcOff, double[] dstPts, int dstOff, int numPts) throws TransformException
Converts a list of coordinate points. This method performs the same calculation than abovetransform(double[], int, double[], int, boolean)
method, but is overridden for efficiency.- Specified by:
transform
in interfaceMathTransform
- Overrides:
transform
in classAbstractMathTransform
- Parameters:
srcPts
- the array containing the source point coordinates.srcOff
- the offset to the first point to be transformed in the source array.dstPts
- the array into which the transformed point coordinates are returned. May be the same thansrcPts
.dstOff
- the offset to the location of the first transformed point that is stored in the destination array.numPts
- the number of point objects to be transformed.- Throws:
TransformException
- if a point can not be converted.
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inverseTransform
protected void inverseTransform(double[] srcPts, int srcOff, double[] dstPts, int dstOff) throws ProjectionException
Converts the specified (x,y) coordinates and stores the result indstPts
(angles in radians).- Specified by:
inverseTransform
in classNormalizedProjection
- 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 thansrcPts
). Coordinates will be (longitude, latitude) angles in radians.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.
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