ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Geometry Namespace / GeometryEngine Class / Project Method
The geometry to be projected. If the input geometry is empty, then an empty geometry with the output spatial reference is returned.
The spatial reference to which the geometry will be projected.

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    Project Method (GeometryEngine)
    In This Topic
    Projects the given geometry to a new spatial reference. Same as GeometryEngine.ProjectEx(geometry, ProjectionTransformation.Create(geometry.SpatialReference, outputSpatialReference)); or, if both spatial references have vertical coordinate systems same as GeometryEngine.ProjectEx(geometry, ProjectionTransformation.CreateWithVertical(geometry.SpatialReference, outputSpatialReference));


    The geometry to be projected. If the input geometry is empty, then an empty geometry with the output spatial reference is returned.
    The spatial reference to which the geometry will be projected.

    Return Value

    The projected geometry.
    Geometry is null.
    The method is not implemented for GeometryBag.
    geometry.SpatialReference or output spatial reference is null.
    geometry.SpatialReference or output spatial reference is unknown coordinate system.
    Determine grid convergence for a SpatialReference at a given point
    Coordinate2D coordinate = new Coordinate2D(10, 30);
    double angle = SpatialReferences.WGS84.GetConvergenceAngle(coordinate);
    // angle = 0
    SpatialReference srUTM30N = SpatialReferenceBuilder.CreateSpatialReference(32630);
    coordinate.X = 500000;
    coordinate.Y = 550000;
    angle = srUTM30N.GetConvergenceAngle(coordinate);
    // angle = 0
    MapPoint pointWGS84 = MapPointBuilderEx.CreateMapPoint(10, 50, SpatialReferences.WGS84);
    MapPoint pointUTM30N = GeometryEngine.Instance.Project(
      pointWGS84, srUTM30N) as MapPoint;
    coordinate = (Coordinate2D)pointUTM30N;
    // get convergence angle and convert to degrees
    angle = srUTM30N.GetConvergenceAngle(coordinate) * 180 / Math.PI;
    // angle = 10.03
    Zoom to a specified point
    //Create a point
    var pt = MapPointBuilderEx.CreateMapPoint(x, y, 
    //Buffer it - for purpose of zoom
    var poly = GeometryEngine.Instance.Buffer(pt, buffer_size);
    //do we need to project the buffer polygon?
    if (!MapView.Active.Map.SpatialReference.IsEqual(poly.SpatialReference))
      //project the polygon
      poly = GeometryEngine.Instance.Project(poly, MapView.Active.Map.SpatialReference);
    // Must run on MCT.
    QueuedTask.Run(() =>
      //Zoom - add in a delay for animation effect
      MapView.Active.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
    Project from WGS84 to WebMercator
    MapPoint pt = MapPointBuilderEx.CreateMapPoint(1.0, 3.0, SpatialReferences.WGS84);
    Geometry result = GeometryEngine.Instance.Project(pt, SpatialReferences.WebMercator);
    MapPoint projectedPt = result as MapPoint;
    Project from WGS84
    // create the polygon
    List<MapPoint> pts = new List<MapPoint>();
    pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84));
    pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 2.0, SpatialReferences.WGS84));
    pts.Add(MapPointBuilderEx.CreateMapPoint(2.0, 2.0, SpatialReferences.WGS84));
    pts.Add(MapPointBuilderEx.CreateMapPoint(2.0, 1.0, SpatialReferences.WGS84));
    Polygon polygon = PolygonBuilderEx.CreatePolygon(pts);
    // ensure it is simple
    bool isSimple = GeometryEngine.Instance.IsSimpleAsFeature(polygon);
    // create the spatial reference to project to
    SpatialReference northPole = SpatialReferenceBuilder.CreateSpatialReference(102018);   // north pole stereographic 
    // project
    Geometry geometry = GeometryEngine.Instance.Project(polygon, northPole);
    Use Select or Search with a Spatial Query
    //var featSceneLayer = ...;
    //var sname = featSceneLayer.Name;
    await QueuedTask.Run(() =>
      if (!featSceneLayer.HasAssociatedFeatureService)
        return;//no search or select
      //Select all features within the current map view
      var sz = MapView.Active.GetViewSize();
      var map_pt1 = MapView.Active.ClientToMap(new System.Windows.Point(0, sz.Height));
      var map_pt2 = MapView.Active.ClientToMap(new System.Windows.Point(sz.Width, 0));
      //Convert to an envelope
      var temp_env = EnvelopeBuilderEx.CreateEnvelope(map_pt1, map_pt2, MapView.Active.Map.SpatialReference);
      //Project if needed to the layer spatial ref
      SpatialReference sr = null;
      using (var fc = featSceneLayer.GetFeatureClass())
      using (var fdef = fc.GetDefinition())
        sr = fdef.GetSpatialReference();
      var env = GeometryEngine.Instance.Project(temp_env, sr) as Envelope;
      //Set up a query filter
      var sf = new SpatialQueryFilter()
        FilterGeometry = env,
        SpatialRelationship = SpatialRelationship.Intersects,
        SubFields = "*"
      //Select against the feature service
      var select = featSceneLayer.Select(sf);
      if (select.GetCount() > 0)
        //enumerate over the selected features
        using (var rc = select.Search())
          while (rc.MoveNext())
            using (var feature = rc.Current as Feature)
              var oid = feature.GetObjectID();

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also