GeographicTransformation
require(["esri/geometry/support/GeographicTransformation"], function(GeographicTransformation) { /* code goes here */ });esri/geometry/support/GeographicTransformationProjecting your data between coordinate systems sometimes requires transforming between geographic coordinate systems. Geographic transformations are used to transform coordinates between spatial references that have different geographic coordinate systems, and thus different datums. Using the most suitable transformation ensures the best possible accuracy when converting geometries from one spatial reference to another.
The projection module provides the getTransformation() and getTransformations() methods which return the default geographic transformation for the given projection or a list of suitable geographic transformations.
Known Limitations
Currently, the client-side projection engine only supports equation-based geographic transformations.
- See also:
Constructors
- new GeographicTransformation(properties)
- Parameter:properties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Property Overview
| Name | Type | Summary | Class | |
|---|---|---|---|---|
| GeographicTransformationStep[] | Geographic transformation steps. more details | more details | GeographicTransformation |
Property Details
Geographic transformation steps. Each step represents a geographic transformation that will be used in the process of transforming coordinates from one geographic coordinate system to another.
Method Overview
| Name | Return Type | Summary | Class | |
|---|---|---|---|---|
| GeographicTransformation | Returns the inverse of the geographic transformation calling this method or | more details | GeographicTransformation |
Method Details
- getInverse(){GeographicTransformation}
Returns the inverse of the geographic transformation calling this method or
nullif the transformation is not invertible. The inverse of a transformation converts coordinates using the same method and parameters, but in the opposite direction of the original object. For example if the original object represents theNAD_1983_HARN_To_NAD_1983_NSRS2007_1transformation, then the inverse will transform fromNAD 83 (NSRS 2007)toNAD 83 (HARN).Returns:Type Description GeographicTransformation Returns the inverse of the datum transformation or nullif the transformation is not invertible.