ArcGIS Pro 3.1 API Reference Guide
ArcGIS.Core.Geometry Namespace / CompositeGeographicTransformation Class
Members Example

In This Topic
    CompositeGeographicTransformation Class
    In This Topic
    A composite geographic transformation class is an ordered list of GeographicTransformation classes. The geographic transformations are applied in the order they are stored.
    Object Model
    CompositeGeographicTransformation ClassCompositeGeographicTransformation ClassDatumTransformation ClassSpatialReference ClassGeographicTransformation ClassSpatialReference Class
    Syntax
    public sealed class CompositeGeographicTransformation : DatumTransformation 
    Public NotInheritable Class CompositeGeographicTransformation 
       Inherits DatumTransformation
    Example
    Determine Transformations
    // methods need to run on the MCT
    ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
    {
      //
      // find the first transformation used between spatial references 4267 and 4326
      //
      SpatialReference sr4267 = 
           SpatialReferenceBuilder.CreateSpatialReference(4267);
      SpatialReference sr4326 = SpatialReferences.WGS84;
    
      List<ProjectionTransformation> transformations = 
             ProjectionTransformation.FindTransformations(sr4267, sr4326);
      // transformations.Count = 1
      ProjectionTransformation projTrans = transformations[0];
      CompositeGeographicTransformation compositeGT = 
           projTrans.Transformation as CompositeGeographicTransformation;
      GeographicTransformation gt = compositeGT[0];
      // gt.Wkid = 15851
      // gt.Name = "NAD_1927_To_WGS_1984_79_CONUS"
      // gt.IsForward = true
    
    
      //
      // find the first five transformation used between spatial references 4267 and 4326
      //
      transformations = ProjectionTransformation.FindTransformations(
                                         sr4267, sr4326, numResults: 5);
      // transformations.Count = 5
      projTrans = transformations[0];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 1
      // compositeGT[0].Wkid = 15851
      // compositeGT[0].Name = "NAD_1927_To_WGS_1984_79_CONUS"
      // compositeGT[0].IsForward = true
    
      projTrans = transformations[1];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 1
      // compositeGT[0].Wkid = 1173
      // compositeGT[0].Name = "NAD_1927_To_WGS_1984_4"
      // compositeGT[0].IsForward = true
    
      projTrans = transformations[2];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 1
      // compositeGT[0].Wkid = 1172
      // compositeGT[0].Name = "NAD_1927_To_WGS_1984_3"
      // compositeGT[0].IsForward = true
    
      projTrans = transformations[3];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 2
      // compositeGT[0].Wkid = 1241
      // compositeGT[0].Name = "NAD_1927_To_NAD_1983_NADCON"
      // compositeGT[0].IsForward = true
    
      // compositeGT[1].Wkid = 108190
      // compositeGT[1].Name = "WGS_1984_(ITRF00)_To_NAD_1983"
      // compositeGT[1].IsForward = false
    
      projTrans = transformations[4];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 2
      // compositeGT[0].Wkid = 1241
      // compositeGT[0].Name = "NAD_1927_To_NAD_1983_NADCON"
      // compositeGT[0].IsForward = true
    
      // compositeGT[1].Wkid = 1515
      // compositeGT[1].Name = "NAD_1983_To_WGS_1984_5"
      // compositeGT[1].IsForward = true
    
    
      //
      // find the first transformation used between spatial
      // references 4267 and 4326 within Alaska
      //
    
      // Alaska
      Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(-161, 61, -145, 69);
      transformations = ProjectionTransformation.FindTransformations(
                                                  sr4267, sr4326, envelope);
      // transformations.Count = 1
      projTrans = transformations[0];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 2
      // compositeGT[0].Wkid = 1243
      // compositeGT[0].Name = "NAD_1927_To_NAD_1983_Alaska"
      // compositeGT[0].IsForward = true
    
      // compositeGT[1].Wkid = 108190
      // compositeGT[1].Name = "WGS_1984_(ITRF00)_To_NAD_1983"
      // compositeGT[1].IsForward = false
    
    
      //
      // find the first geographic transformation used between two spatial references with VCS  (use vertical = false)
      //
      SpatialReference inSR = 
                      SpatialReferenceBuilder.CreateSpatialReference(4269, 115702);
      SpatialReference outSR = 
                      SpatialReferenceBuilder.CreateSpatialReference(4326, 3855);
    
      // Even though each spatial reference has a VCS,
      // vertical = false should return geographic transformations.
      transformations = ProjectionTransformation.FindTransformations(inSR, outSR);
      // transformations.Count = 1
      projTrans = transformations[0];
      compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
      // compositeGT.Count = 1
      // compositeGT[0].Wkid = 108190
      // compositeGT[0].Name = ""WGS_1984_(ITRF00)_To_NAD_1983"
      // compositeGT[0].IsForward = false
    
      //
      // find the first vertical transformation used between two spatial references with VCS  (use vertical = true)
      //
    
      transformations = 
                ProjectionTransformation.FindTransformations(
                                        inSR, outSR, vertical: true);
      // transformations.Count = 1
      projTrans = transformations[0];
    
      CompositeHVDatumTransformation compositeHV = 
              projTrans.Transformation as CompositeHVDatumTransformation;
      // compositeHV.Count = 2
      // compositeHV[0].Wkid = 1188
      // compositeHV[0].Name = "NAD_1983_To_WGS_1984_1"
      // compositeHV[0].IsForward = true
    
      // compositeHV[1].Wkid = 110019
      // compositeHV[1].Name = "WGS_1984_To_WGS_1984_EGM2008_2.5x2.5_Height"
      // compositeHV[1].IsForward = true
    });
    Inheritance Hierarchy

    System.Object
       ArcGIS.Core.Geometry.DatumTransformation
          ArcGIS.Core.Geometry.CompositeGeographicTransformation

    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.0 or higher.
    See Also