GeographicTransformationStep | API Reference | ArcGIS Maps SDK for JavaScript 4.31

Represents a step in the process of transforming coordinates from one geographic coordinate system to another. A geographic transformation step can be constructed from a well-known ID (wkid) or a well known text (wkt) that represents a geographic datum transformation.

See also

Constructors

GeographicTransformationStep Constructor new GeographicTransformationStep(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Type	Summary	Class
Boolean	Indicates with the geographic transformation is inverted.	GeographicTransformationStep
Number	The well-known id (wkid) hat represents a known geographic transformation.	GeographicTransformationStep
String	The well-known text (wkt) that represents a known geographic transformation.	GeographicTransformationStep

Property Details

isInverse Property isInverse Boolean

Indicates with the geographic transformation is inverted.

Default Value:false

wkid Property wkid Number

The well-known id (wkid) hat represents a known geographic transformation. See Geographic datum transformations for the list of supported equation-based geographic transformations.

Example

// Create a geographic transformation step for Tokyo_To_WGS_1984_2001 using its wkid
let geoStep = new GeographicTransformationStep({
  wkid: 108106
});

wkt Property wkt String

The well-known text (wkt) that represents a known geographic transformation. See Geographic datum transformations for the list of supported equation-based geographic transformations.

Example

// Create a geographic transformation step for NAD_1927_To_WGS_1984_1
// using its well known text or wkt
let wkt = "GEOGTRAN[\"NAD_1927_To_WGS_1984_1\",GEOGCS[\"GCS_North_American_1927\",DATUM[\"D_North_American_1927\",SPHEROID[\"Clarke_1866\",6378206.4,294.9786982]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],METHOD[\"Geocentric_Translation\"],PARAMETER[\"X_Axis_Translation\",-3.0],PARAMETER[\"Y_Axis_Translation\",142.0],PARAMETER[\"Z_Axis_Translation\",183.0]]";
let geoStep = new GeographicTransformationStep({
  wkid: wkt
});

Method Overview

Name	Return Type	Summary	Class
	GeographicTransformationStep	Gets the inverse of the geographic transformation step used to call this method or `null` if the transformation step is not invertible.	GeographicTransformationStep

Method Details

getInverse Method getInverse(){GeographicTransformationStep}

Gets the inverse of the geographic transformation step used to call this method or null if the transformation step 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 the NAD_1983_HARN_To_NAD_1983_NSRS2007_1 transformation, then the inverse will transform from NAD 83 (NSRS 2007) to NAD 83 (HARN).

Returns

Type	Description
GeographicTransformationStep	Returns the inverse of the geographic transformation step or `null` if the transformation is not invertible.