ArcGIS Runtime SDK for iOS: AGSDatumTransformation Class Reference
ArcGIS Runtime SDK for iOS  100.14
AGSDatumTransformation Class Reference

Description

A base class for transformation between two coordinate systems that have different datums.

This is the base class for classes used to transform coordinates between spatial references that have different datums. The inverse of the datum transformation, used to transform in the opposite direction, may be accessed using a member function.

A datum transformation has a name property intended to be suitable for display, such as when displaying a list of available transformations to an end user.

You can get a list of suitable transformations for a given input and output spatial reference using methods of the AGSTransformationCatalog class. Some transformations require that certain Projection Engine data files be present on the local file system. The property AGSDatumTransformation::missingProjectionEngineFiles indicates whether any of the files are missing. The complete list of necessary files is available using the AGSGeographicTransformationStep::projectionEngineFilenames or AGSHorizontalVerticalTransformationStep::projectionEngineFilenames properties.

Note
In order for any Projection Engine files to be found, the data location must be set first using the projectionEngineDirectory (AGSTransformationCatalog) property.

A datum transformation object is immutable

See also
AGSTransformationCatalog to find a list of suitable tranformations between two spatial references
Since
100.2
Inheritance diagram for AGSDatumTransformation:
AGSObject AGSGeographicTransformation AGSHorizontalVerticalTransformation

Instance Methods

(nullable AGSDatumTransformation *) - inverse
 
(BOOL) - isEqualToDatumTransformation:
 

Properties

AGSSpatialReferenceinputSpatialReference
 
BOOL missingProjectionEngineFiles
 
NSString * name
 
AGSSpatialReferenceoutputSpatialReference
 

Method Documentation

◆ inverse

- (nullable AGSDatumTransformation *) inverse

Returns the inverse of this datum transformation.

Since
100.2

◆ isEqualToDatumTransformation:

- (BOOL) isEqualToDatumTransformation: (AGSDatumTransformation *)  other

Compares this spatial reference with the provided one for equality.

Parameters
othertransformation to compare this one to.
Returns
boolean indicating whether the two transformation are equal
Since
100.2

Property Documentation

◆ inputSpatialReference

- (AGSSpatialReference*) inputSpatialReference
readnonatomicstrong

The input spatial reference this transformation can be applied on.

Since
100.2

◆ missingProjectionEngineFiles

- (BOOL) missingProjectionEngineFiles
readnonatomicassign

Indicates whether any data files needed by the Projection Engine is missing from the local file system.

Note
In order for any Projection Engine files to be found, the location must be set upon application startup using setProjectionEngineDirectory:error: (AGSTransformationCatalog) before using any other Runtime API.
Since
100.2

◆ name

- (NSString*) name
readnonatomiccopy

The name of the datum transformation. For multi-step transformations, the name contains the concatenated names of each step's transformation, separated by a plus sign '+'. If the transformation is inverted, the name starts with a tilde (~).

Since
100.2

◆ outputSpatialReference

- (AGSSpatialReference*) outputSpatialReference
readnonatomicstrong

The output spatial reference this transformation produces

Since
100.2