Transform2D Method—ArcGIS Pro

Transforms an array of 2D coordinates. Returns an array of transformed 2D coordinates.

Syntax

C#
Visual Basic (Declaration)

int Transform2D( 
   Coordinate2D[] inCoordinates,
   ProjectionTransformation projectionTransformation,
   ref Coordinate2D[] outCoordinates,
   bool removeClippedCoordinates
)

Function Transform2D( _
   ByVal inCoordinates() As Coordinate2D, _
   ByVal projectionTransformation As ProjectionTransformation, _
   ByRef outCoordinates As Coordinate2D(), _
   Optional ByVal removeClippedCoordinates As Boolean _
) As Integer

Parameters

inCoordinates: The array of coordinates to be transformed.
projectionTransformation: The projection transformation specifying the input and output spatial references and possibly the geographic transformations to use for the transformation.
outCoordinates: The array of transformed coordinates. If it is null or the length is less than the length of inCoordinates, then a new array will be allocated.
removeClippedCoordinates: (Optional) The boolean value specifying whether to remove clipped coordinates or not. If true, the coordinates outside of the horizon will be removed from the output array, and the number of initialized elements in the output array is the number of coordinates transformed which may be less than the number of elements in inCoordinates. If false, all coordinates are preserved, the clipped out coordinates are set to NaN in the output array, and the number of elements in the output array is equal to the number of elements in inCoordinates. The default value is false.

Return Value

The number of transformed coordinates.

Exceptions

Exception	Description
System.ArgumentNullException	Input parameter, inCoordinates, is null.
System.ArgumentNullException	ProjectionTransformation is null.

Remarks

This method should be applied to batches of coordinates for fast projection.

Example

// Not all of the input points are transformed as some of them are outside of the GCS horizon.
Coordinate2D[] inCoords2D = new Coordinate2D[]
{
  new Coordinate2D(-1, -1),
  new Coordinate2D(-2, -5),
  new Coordinate2D(-5, -11),
  new Coordinate2D(-10, -19),
  new Coordinate2D(-17, -29),
  new Coordinate2D(-26, -41),
  new Coordinate2D(-37, -5),
  new Coordinate2D(-50, -21),
  new Coordinate2D(-65, -39),
  new Coordinate2D(-82, -9)
};

int arraySize = inCoords2D.Length;

ProjectionTransformation projTrans = ProjectionTransformation.Create(SpatialReferences.WGS84, SpatialReferenceBuilder.CreateSpatialReference(24891));

Coordinate2D[] outCoords2D = new Coordinate2D[arraySize];

// transform and choose to remove the clipped coordinates
int numPointsTransformed = GeometryEngine.Instance.Transform2D(inCoords2D, projTrans, ref outCoords2D, true);

// numPointsTransformed = 4
// outCoords2D.Length = 4

// outCoords2D[0] = {5580417.6876455201, 1328841.2376554986}
// outCoords2D[1] = {3508774.290814558, -568027.23444226268}
// outCoords2D[2] = {1568096.0886155984, -2343435.4394415971}
// outCoords2D[3] = {57325.827391741652, 1095146.8917508761}

// transform and don't remove the clipped coordinates
numPointsTransformed = GeometryEngine.Instance.Transform2D(inCoords2D, projTrans, ref outCoords2D, false);

// numPointsTransformed = 4
// outCoords2D.Length = 10

// outCoords2D[0] = {double.Nan, double.Nan}
// outCoords2D[1] = {double.Nan, double.Nan}
// outCoords2D[2] = {double.Nan, double.Nan}
// outCoords2D[3] = {double.Nan, double.Nan}
// outCoords2D[4] = {double.Nan, double.Nan}
// outCoords2D[5] = {double.Nan, double.Nan}
// outCoords2D[6] = {5580417.6876455201, 1328841.2376554986}
// outCoords2D[7] = {3508774.290814558, -568027.23444226268}
// outCoords2D[8] = {1568096.0886155984, -2343435.4394415971}
// outCoords2D[9] = {57325.827391741652, 1095146.8917508761}

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

Reference

IGeometryEngine Interface
IGeometryEngine Members