Class ObliqueMercator
- All Implemented Interfaces:
Serializable
,Parameterized
,LenientComparable
,MathTransform
,MathTransform2D
Oblique Mercator projection (EPSG codes 9812, 9815).
The Oblique Mercator projection can be seen as a generalization of
Mercator
and TransverseMercator
projections when the central line is not along the equator or a meridian, respectively.
This class covers also the Rectified Skew Orthomorphic (RSO) case.
There is different ways to specify the projection parameters:
- Variant A (EPSG:9812) uses false easting/northing defined at the natural origin of the coordinate system.
- Variant B (EPSG:9815) uses false easting/northing defined at the projection center.
- ESRI "Two Points" variant defines the central line with two points instead of with an azimuth angle.
Mercator
and
TransverseMercator
projections should be preferred, both for performance and accuracy reasons.- Since:
- 1.0
- See Also:
Defined in the sis-referencing
module
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Nested Class Summary
Nested classes/interfaces inherited from class NormalizedProjection
NormalizedProjection.ParameterRole
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Field Summary
Fields inherited from class NormalizedProjection
eccentricity, eccentricitySquared
Fields inherited from class AbstractMathTransform2D
DIMENSION
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Constructor Summary
ConstructorsConstructorDescriptionObliqueMercator
(OperationMethod method, Parameters parameters) Creates an Oblique Mercator projection from the given parameters. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
inverseTransform
(double[] srcPts, int srcOff, double[] dstPts, int dstOff) Converts the specified (x,y) coordinates and stores the result indstPts
(angles in radians).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
.Methods inherited from class NormalizedProjection
computeHashCode, createMapProjection, 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
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Constructor Details
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ObliqueMercator
Creates an Oblique Mercator projection from the given parameters. Themethod
argument can be the description of one of the following:- "Hotine Oblique Mercator (variant A)".
- "Hotine Oblique Mercator (variant B)".
- "Hotine Oblique Mercator two point center" (from ESRI).
- "Hotine Oblique Mercator two point natural origin" (from ESRI).
- "Rectified Skew Orthomorphic".
- Parameters:
method
- description of the projection parameters.parameters
- the parameter values of the projection to create.
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Method Details
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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
. 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:
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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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