# CorrelationGroup

#### new Cesium.CorrelationGroup(options)
engine/Source/Scene/Model/Extensions/Gpm/CorrelationGroup.js 27

Metadata identifying parameters using same correlation modeling and associated correlation parameters. This reflects the `correlationGroup` definition of the NGA_gpm_local glTF extension.

Name | Type | Description
--- | --- | ---
`options` | CorrelationGroup.ConstructorOptions | An object describing initialization options

##### Experimental

This feature is not final and is subject to change without Cesium's standard deprecation policy.

### Members

#### readonly groupFlags : Array.<boolean>
engine/Source/Scene/Model/Extensions/Gpm/CorrelationGroup.js 48

Array of 3 booleans indicating if parameters delta-x delta-y delta-z used in the correlation group

#### readonly params : Array.<Spdcf>
engine/Source/Scene/Model/Extensions/Gpm/CorrelationGroup.js 74

Array of 3 sets of SPDCF parameters, for the U, V, W directions, respectively

#### readonly rotationThetas : Cartesian3
engine/Source/Scene/Model/Extensions/Gpm/CorrelationGroup.js 61

Rotations in milliradians about X, Y, Z axes, respectively

### Type Definitions

#### Cesium.CorrelationGroup.ConstructorOptions
engine/Source/Scene/Model/Extensions/Gpm/CorrelationGroup.js 3

Initialization options for the CorrelationGroup constructor

##### Properties:

Name | Type | Description
--- | --- | ---
`groupFlags` | Array.<boolean> | Array of 3 booleans indicating if parameters delta-x delta-y delta-z used in the correlation group
`rotationThetas` | Cartesian3 | Rotations in milliradians about X, Y, Z axes, respectively
`params` | Array.<Spdcf> | Array of `Spdcf` (Strictly Positive-Definite Correlation Function) parameters, for the U, V, W directions, respectively

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