ProSnippets LinearReferencing

Language:              C#  
Subject:               LinearReferencing  
Contributor:           ArcGIS Pro SDK Team <arcgisprosdk@esri.com>  
Organization:          esri, http://www.esri.com  
Date:                  10/22/2024  
ArcGIS Pro:            3.4  
Visual Studio:         2022  
.NET Target Framework: .Net 8  

Linear Referencing

Create a routes feature class using the DDL

public void CreateRoutes(SchemaBuilder schemaBuilder)
{
    FieldDescription routeIdDescription = FieldDescription.CreateIntegerField("RouteID");
    FieldDescription routeNameDescription = FieldDescription.CreateStringField("RouteName", 100);
    ShapeDescription shapeDescription = new ShapeDescription(GeometryType.Polyline, SpatialReferences.WGS84) { HasM = true, HasZ = false };

    FeatureClassDescription routeFeatureClassDescription = new FeatureClassDescription("Routes", new List<FieldDescription>() { routeIdDescription, routeNameDescription }, shapeDescription);

    //Create an M-enabled poly-line feature class 
    schemaBuilder.Create(routeFeatureClassDescription);
    schemaBuilder.Build();
}

Create an events table using the DDL

public void CreateEvents(SchemaBuilder schemaBuilder)
{
    FieldDescription routeIdDescription = FieldDescription.CreateIntegerField("RID");
    FieldDescription measureFieldDescription = new FieldDescription("Measure", FieldType.Double);
    FieldDescription offsetFieldDescription = FieldDescription.CreateIntegerField("OffsetValue");

    TableDescription eventTableDescription = new TableDescription("LR_EventTable", new List<FieldDescription>() { routeIdDescription, offsetFieldDescription, measureFieldDescription });
    schemaBuilder.Create(eventTableDescription);
    schemaBuilder.Build();
}

Get route information from a polyline feature class with M-values

public void CreateRouteInfo(Geodatabase geodatabase, string routeFeatureClassName = "Roads", string routeIdFieldName = "RouteID")
{
    using (FeatureClass routeFeatureClass = geodatabase.OpenDataset<FeatureClass>(routeFeatureClassName))
    using (FeatureClassDefinition routeFeatureClassDefinition = routeFeatureClass.GetDefinition())
    {
        if (routeFeatureClassDefinition.HasM())
        {
            RouteInfo routeInfo = new RouteInfo(routeFeatureClass, routeIdFieldName);

        }
    }
}

Get event information

public void CreateEventInfo(Geodatabase geodatabase, string eventTableName = "Accidents", string routeIdFieldName = "RID", string measureFieldName = "Measure", string offsetFieldName = "Offset")
{
    using (Table eventTable = geodatabase.OpenDataset<Table>(eventTableName))
    {
        PointEventInfo eventInfo = new PointEventInfo(eventTable, routeIdFieldName, measureFieldName, offsetFieldName);

        // Get event type: Point or Line type
        EventType eventTableType = eventInfo.EventType;
    }
}

Create a RouteEventSource via dynamic segmentation process for point events

public void CreatePointEventSource(Geodatabase geodatabase, string routeFeatureClassName = "Roads", string eventTableName = "Accidents", string routeIdFieldName = "RID", string measureFieldName = "Measure")
{
    using (FeatureClass routesFeatureClass = geodatabase.OpenDataset<FeatureClass>(routeFeatureClassName))
    using (Table eventsTable = geodatabase.OpenDataset<Table>(eventTableName))
    {
        RouteInfo routeInfo = new RouteInfo(routesFeatureClass, routeIdFieldName);
        EventInfo eventInfo = new PointEventInfo(eventsTable, routeIdFieldName, measureFieldName);
        RouteEventSourceOptions routeEventSourceOptions = new PointEventSourceOptions(AngleType.Tangent) { ComplementAngle = true };

        using (RouteEventSource routeEventSource = new RouteEventSource(routeInfo, eventInfo, routeEventSourceOptions))
        using (RouteEventSourceDefinition routeEventSourceDefinition = routeEventSource.GetDefinition())
        {
            // Locating errors 
            IReadOnlyList<RouteEventSourceError> errors = routeEventSource.GetErrors();

            // Route event source fields 
            IReadOnlyList<Field> routeEventSourceFields = routeEventSourceDefinition.GetFields();

            // Add RouteEventSource to the ArcGIS Pro map
            FeatureLayerCreationParams layerParams = new FeatureLayerCreationParams(routeEventSource)
            {
                Name = "RoadAccidents"
            };

            LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, MapView.Active.Map);
        }
    }
}

Create a RouteEventSource via dynamic segmentation process for line events

public void CreateLineEventSource(Geodatabase geodatabase, string routeFeatureClassName = "Roads", string eventTableName = "Accidents", string routeIdFieldName = "RID", string toMeasureFieldName = "toMeasure", string fromMeasureFieldName = "fromMeasure", string offsetFieldName = "Offset")
{
    using (FeatureClass routesFeatureClass = geodatabase.OpenDataset<FeatureClass>(routeFeatureClassName))
    using (Table eventsTable = geodatabase.OpenDataset<Table>(eventTableName))
    {
        RouteInfo routeInfo = new RouteInfo(routesFeatureClass, routeIdFieldName);
        EventInfo eventInfo = new LineEventInfo(eventsTable, routeIdFieldName, fromMeasureFieldName, toMeasureFieldName, offsetFieldName);
        RouteEventSourceOptions routeEventSourceOptions = new LineEventSourceOptions() { IsPositiveOffsetOnRight = true };

        using (RouteEventSource routeEventSource = new RouteEventSource(routeInfo, eventInfo, routeEventSourceOptions))
        using (RouteEventSourceDefinition routeEventSourceDefinition = routeEventSource.GetDefinition())
        {
            // Locating errors 
            IReadOnlyList<RouteEventSourceError> errors = routeEventSource.GetErrors();

            // Route event source fields 
            IReadOnlyList<Field> routeEventSourceFields = routeEventSourceDefinition.GetFields();

            // Add RouteEventSource to the ArcGIS Pro map
            FeatureLayerCreationParams layerParams = new FeatureLayerCreationParams(routeEventSource)
            {
                Name = "HighCrashAreas"
            };

            LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, MapView.Active.Map);
        }
    }
}

Locate features along routes

public void LocateLineFeaturesAlongRoutes(Geodatabase geodatabase, string routeFeatureClassName = "Roads", string eventTableName = "Accidents", string routeIdFieldName = "RID", string toMeasureFieldName = "toMeasure", string fromMeasureFieldName = "fromMeasure")
{
    // Configure events table
    EventTableConfiguration lineEventTableConfiguration = new LineEventTableConfiguration(eventTableName, routeIdFieldName, fromMeasureFieldName, toMeasureFieldName) { KeepAllFields = true, MDirectionOffset = true };

    using (FeatureClass routeFeatureClass = geodatabase.OpenDataset<FeatureClass>(routeFeatureClassName))
    using (FeatureClass highCrashAreaFeatureClass = geodatabase.OpenDataset<FeatureClass>("HighCrashRegion"))
    {
        RouteInfo routeInfo = new RouteInfo(routeFeatureClass, routeIdFieldName);

        // Creates an event table inside the geodatabase
        routeInfo.LocateFeatures(highCrashAreaFeatureClass, 0.5, lineEventTableConfiguration);

        // Open newly created event table
        using (Table eventTable = geodatabase.OpenDataset<Table>(eventTableName))
        {
            EventInfo eventInfo = new LineEventInfo(eventTable, routeIdFieldName, fromMeasureFieldName, toMeasureFieldName);

            // Create RouteEventSource using new event table
            using (RouteEventSource routeEventSource = new RouteEventSource(routeInfo, eventInfo, new LineEventSourceOptions()))
            {
                // Use the RouteEventSource object 
            }
        }
    }
}