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 -
Field Summary
Fields inherited from class NormalizedProjection
eccentricity, eccentricitySquaredFields inherited from class AbstractMathTransform2D
DIMENSION -
Constructor Summary
ConstructorsConstructorDescriptionObliqueMercator(OperationMethod method, Parameters parameters) Creates an Oblique Mercator projection from the given parameters. -
Method Summary
Modifier and TypeMethodDescriptionprotected voidinverseTransform(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) Projects the specified (λ,φ) coordinates (units in radians) and stores the result indstPts.Methods inherited from class NormalizedProjection
computeHashCode, createMapProjection, equals, getContextualParameters, getParameterDescriptors, getParameterValues, inverse, tryConcatenateMethods inherited from class AbstractMathTransform2D
createTransformedShape, derivative, getSourceDimensions, getTargetDimensions, transformMethods inherited from class AbstractMathTransform
derivative, equals, formatTo, getDomain, hashCode, isIdentity, transform, transform, transform, transform, transformMethods inherited from class FormattableObject
print, toString, toString, toWKTMethods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, waitMethods 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. Themethodargument 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 Projects the specified (λ,φ) coordinates (units in radians) and stores the result indstPts. In addition, opportunistically computes the projection derivative ifderivateistrue. The results must be multiplied by the denormalization matrix before to get linear distances.- Specified by:
transformin classNormalizedProjection- Parameters:
srcPts- the array containing the source point coordinates, as (longitude, latitude) angles in radians.srcOff- the offset of the single coordinate tuple to be converted in the source array.dstPts- the array into which the converted coordinates 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 coordinates that is stored in the destination array.derivate-truefor computing the derivative, orfalseif not needed.- Returns:
- the matrix of the projection derivative at the given source position,
or
nullif thederivateargument isfalse. - Throws:
ProjectionException- if the coordinates cannot 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:
inverseTransformin classNormalizedProjection- Parameters:
srcPts- the array containing the source point coordinates, 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 coordinates 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 cannot be converted.
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