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GeographicTransformation QML Type

Function used to transform coordinates between spatial references that have different datums. More...

Import Statement: import Esri.ArcGISRuntime 100.6
Since: Esri.ArcGISRuntime 100.2
Inherits:

DatumTransformation

Properties

  • steps : list<GeographicTransformationStep>

Signals

Detailed Description

Each GeographicTransformation has an input and an output spatial reference. The transformation operates on the datums in each spatial reference.

The inverse of the GeographicTransformation, if any, used to transform in the opposite direction, may be accessed using the inverse member function.

A GeographicTransformation can be constructed from a single GeographicTransformationStep, or from a list of GeographicTransformationSteps that are chained together. Most transformations between spatial references that do not share the WGS 1984 datum use WGS 1984 as an intermediate datum. Thus, it is common to create a GeographicTransformation with two GeographicTransformationSteps: first to transform from the datum in the input spatial reference to WGS 1984, and then from WGS 1984 to the output spatial reference's datum. There are a limited number of transformations directly between two non-WGS84 datums, such as WKID 4461, which is NAD_1983_HARN_To_NAD_1983_NSRS2007_1. These do not need WGS 1984 as an intermediate datum.

In most cases, you do not need to create your own GeographicTransformation. You can get a list of suitable transformations for a given input and output spatial reference using one of the TransformationCatalog::transformationsBySuitability functions.

A GeographicTransformation object is immutable.

Property Documentation

Returns the list of geographic transformation steps in this GeographicTransformation (read-only).

See also GeographicTransformationStep.


Signal Documentation

stepsChanged()

Emitted when the steps property changes.



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