IGridTransformation Interface

Provides access to members that control the dataset name for a grid-based transformation.

Description

The IGridTransformation interface defines the parameters for a grid-based geographic (datum) transformation method. Currently, the NADCON and HARN (HPGN) methods for the United States are supported. The only parameter is the grid location and name.

Two functions are supported: Load and Unload. The transformation grids can range in size from 2-500 KB and are very expensive to access. The Load function places the requested grid into memory which greatly improves performance. Unload releases the memory.

Members

	Name	Description
	GetSpatialReferences	Returns the from and to spatial references for the transformation.
	GridDatasetName	The name of a dataset containing gridded transformation values for a geographic area.
	Load	Makes the grid data available for transformation operations. Called automatically.
	Name	The name of the geographic transformation.
	PutSpatialReferences	Sets the from and to spatial references for the transformation.
	TransformMeasuresFF	Transforms floating point measures to floating point measures (or do the inverse).
	TransformMeasuresFI	Transforms floating point measures to integer measures (or do the inverse).
	TransformMeasuresIF	Transforms integer measures to floating point measures (or do the inverse).
	TransformMeasuresII	Transforms integer measures to integer measures (or do the inverse).
	TransformPointsFF	Transforms floating point points to floating point points (or do the inverse).
	TransformPointsFI	Transforms floating point points to integer points (or do the inverse).
	TransformPointsIF	Transforms integer points to floating point points (or do the inverse).
	TransformPointsII	Transforms integer points to integer points (or do the inverse).
	Unload	Releases any resources consumed by the grid data.

IGridTransformation.GridDatasetName Property

The name of a dataset containing gridded transformation values for a geographic area.

Public Property GridDatasetName As String

public string GridDatasetName {get; set;}

IGridTransformation.Load Method

Makes the grid data available for transformation operations. Called automatically.

Public Sub Load ( _
)

public void Load (
);

IGridTransformation.Unload Method

Releases any resources consumed by the grid data.

Public Sub Unload ( _
)

public void Unload (
);

Inherited Interfaces

Interfaces	Description
IGeoTransformation	Provides access to members that define a geographic (datum) transformation.
ITransformation	Provides access to members that apply a function (or its inverse) to a set of points or measures. The suffix of each method indicates the type of parameters operated on.

Classes that implement IGridTransformation

Classes	Description
GEOCONTransformation	Creates a GEOCON-based transformation.
HARNTransformation	Creates a HARN-based transformation.
NADCON5Transformation	Creates a NADCON5-based transformation.
NADCONTransformation	Creates a NADCON-based transformation.
NTv2Transformation	Creates a NTv2-based transformation.