程序包 org.locationtech.proj4j

类 BasicCoordinateTransform

java.lang.Object

org.locationtech.proj4j.BasicCoordinateTransform

所有已实现的接口:

CoordinateTransform

public class BasicCoordinateTransform
extends Object
implements CoordinateTransform

Represents the operation of transforming a ProjCoordinate from one CoordinateReferenceSystem into a different one, using reprojection and datum conversion as required.

Computing the transform involves the following steps:

• If the source coordinate is in a projected coordinate system, it is inverse-projected into a geographic coordinate system based on the source datum
• If the source and target Datums are different, the source geographic coordinate is converted from the source to the target datum as accurately as possible
• If the target coordinate system is a projected coordinate system, the converted geographic coordinate is projected into a projected coordinate.

Symbolically this can be presented as:

 [ SrcProjCRS {InverseProjection} ] SrcGeoCRS [ {Datum Conversion} ] TgtGeoCRS [ {Projection} TgtProjCRS ]
 

BasicCoordinateTransform objects are stateful, and thus are not thread-safe. However, they may be reused any number of times within a single thread.

Information about the transformation procedure is pre-computed and cached in this object for efficient computation.

作者:

Martin Davis

另请参阅:

CoordinateTransformFactory

构造器概要

构造器

构造器	说明
BasicCoordinateTransform(CoordinateReferenceSystem srcCRS, CoordinateReferenceSystem tgtCRS)	Creates a transformation from a source CoordinateReferenceSystem to a target one.

方法概要

限定符和类型	方法	说明
CoordinateReferenceSystem	getSourceCRS()
CoordinateReferenceSystem	getTargetCRS()
ProjCoordinate	transform(ProjCoordinate src, ProjCoordinate tgt)	Transforms a coordinate from the source CoordinateReferenceSystem to the target one.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

BasicCoordinateTransform

public BasicCoordinateTransform(CoordinateReferenceSystem srcCRS,
                                CoordinateReferenceSystem tgtCRS)

Creates a transformation from a source CoordinateReferenceSystem to a target one.

参数:

srcCRS - the source CRS to transform from

tgtCRS - the target CRS to transform to

方法详细资料

getSourceCRS

public CoordinateReferenceSystem getSourceCRS()

指定者:

getSourceCRS 在接口中 CoordinateTransform

getTargetCRS

public CoordinateReferenceSystem getTargetCRS()

指定者:

getTargetCRS 在接口中 CoordinateTransform

transform

public ProjCoordinate transform(ProjCoordinate src,
                                ProjCoordinate tgt)
                         throws Proj4jException

Transforms a coordinate from the source CoordinateReferenceSystem to the target one.

指定者:

transform 在接口中 CoordinateTransform

参数:

src - the input coordinate to be transformed

tgt - the transformed coordinate

返回:

the target coordinate which was passed in

抛出:

Proj4jException - if a computation error is encountered