GeographicTransformationStep class final

Represents a step in the process of transforming between datums.

Each geographic transformation step can be constructed from a well-known ID (WKID) that represents a geographic transformation. Because the Projection Engine supports thousands of transformations, WKIDs are not presented in the SDK as enumerations. Instead, they are documented in the developers guide.

The list of supported WKIDs includes a transformation from every supported datum to WGS 1984. Additionally, there is more limited list of transformations directly between two non-WGS84 datums, such as 4461, which is NAD_1983_HARN_To_NAD_1983_NSRS2007_1.

Transformations with more than one step typically go via WGS84, with one forward and one inverse geographic transformation chained together to get the required geographic coordinates.

A geographic transformation step object is immutable.

Implemented types

Constructors

GeographicTransformationStep.withWkid(int wkid)
Creates a new GeographicTransformationStep instance from a well-known ID.
factory
GeographicTransformationStep.withWkText(String wkText)
Creates a new GeographicTransformationStep instance from a well-known text string.
factory

Properties

hashCode → int
The hash code for this object.
no setteroverride
isInverse → bool
True if this geographic transformation step instance is an inverted transformation.
no setter
isMissingProjectionEngineFiles → bool
True if any files needed by the Projection Engine for this geographic transformation step are missing from the local file system.
no setter
projectionEngineFilenames → List<String>
A list of the Projection Engine files required to support this geographic transformation step.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
wkid → int
The well-known ID, or 0 if the transformation in this step does not have a well-known ID.
no setter
wkText → String
The well-known text of this geographic transformation step instance.
no setter

Methods

getInverse() → GeographicTransformationStep
Returns the inverse of this geographic transformation step or null if the transformation is not invertible.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
override