Package org.geotools.ct

Coordinate Transformations implementation.

See:
Description

Interface Summary

LinearTransform	Deprecated. Replaced by LinearTransform in the org.geotools.referencing.operation package.
MathTransform	Deprecated. Replaced by MathTransform in the org.opengis.referencing.operation package.
MathTransform1D	Deprecated. Replaced by MathTransform1D in the org.opengis.referencing.operation package.
MathTransform2D	Deprecated. Replaced by MathTransform2D in the org.opengis.referencing.operation package.

Class Summary

AbstractMathTransform	Deprecated. Replaced by AbstractMathTransform in the org.geotools.referencing.operation.transform package.
Adapters	Deprecated. The legacy OpenGIS CT package is deprecated.
CoordinateTransformation	Deprecated. Replaced by AbstractCoordinateOperation.
CoordinateTransformationFactory	Deprecated. Replaced by org.geotools.referencing.operation.DefaultCoordinateOperationFactory
DomainFlags	Deprecated. No replacement.
MathTransformFactory	Deprecated. Replaced by DefaultMathTransformFactory in the org.geotools.referencing.operation package.
MathTransformProvider	Deprecated. Replaced by MathTransformProvider in the org.geotools.referencing.operation package.
TransformType	Deprecated. Replaced by DefaultOperation sub interfaces.

Exception Summary

CannotCreateTransformException	Deprecated. Replaced by OperationNotFoundException.
MissingParameterException	Deprecated. Replaced by ParameterNotFoundException.
NoSuchClassificationException	Deprecated. Replaced by NoSuchIdentifierException.

Package org.geotools.ct Description

Coordinate Transformations implementation. A CoordinateTransformation object is a transformation between two CoordinateSystem objects (for example a map projection from a GeographicCoordinateSystem to a ProjectedCoordinateSystem). Coordinate transformations can be built with the following steps:

• Create source and target coordinate systems, which may or may not be two-dimensional.
• Create the coordinate transformation with CoordinateTransformationFactory.

The CoordinateTransformationFactory class analyze source and target coordinate systems and try to build a transformation path. It can swap axis order and orientation when necessary (for example from (NORTH,WEST) to (EAST,NORTH)), apply units conversions and of course performs map projections.

CoordinateTransformationFactory is a kind of high-level API. User wanting more control on transformation creation can use a low-level API: MathTransformFactory. For example, a mercator cylindrical projection can be created by the following code:

MathTransformFactory factory = MathTransformFactory.getDefault();
ParameterList parameters = factory.getMathTransformProvider("Mercator_1SP").getParameterList();
parameters.setParameter("semi_major", 6378137.0);
parameters.setParameter("semi_minor", 6356752.314);
MathTransform projection = factory.createParameterizedTransform(parameters);
    

The "Mercator_1SP" string is the classification name for the mercator cylindrical projection. This package support the following classification names:

Classification	EPSG code
Affine
Geocentric_To_Ellipsoid	9602
Ellipsoid_To_Geocentric	9602
Lambert_Conformal_Conic_1SP	9801
Lambert_Conformal_Conic_2SP	9802
Mercator_1SP	9804
Mercator_2SP	9805
Transverse_Mercator	9807
Oblique_Stereographic	9809
Polar_Stereographic	9810
Albers_Conic_Equal_Area	9822

Notes on transformation accuracy