Assign Geometric Network connectivity using ArcObjects

Discussion created by esrispaindeveloper on Feb 13, 2013
Latest reply on Feb 13, 2013 by Hornbydd

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Hi,

Somebody knows if it's possible to assign using an ArcObjects method the connectivy between edges and nodes?

We have two FC Junctions and Edges.

Feature Class Junctions

OBJECTID JUNCTIONID TYPE    NAME....
1           J1      TYPEI   NODE1
2           J2      TYPEII NODE2
3           J3      TYPEI   NODE3
...         ...     ...
...         ...     ...

Feature Class Edges

OBJECTID EDGEID JUNCTIONFROM JUNCTIONTO
1        EDGE1         J1          J5
2        EDGE2         J2          J7
3        EDGE3         J1          J8
4        EDGE4         J2          J9

We want to establish connectivity via ArcObjects, reading the connectivity rules between edges and junctions from Fields JUNCTIONFROM, JUNCTIONTO that are in Edges Feature Class, using an ArcObjects method.

The spatial relationships between entities is like that of the image [ATTACH=CONFIG]21742[/ATTACH]

Any help could be great for us!!

Thank you

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Public Sub SelectDanglingPolylines() ' Description: Takes a polyline dataset and select all dangling polylines. ' ' Requirements: You need to be in edit mode and have added the layer to a MAP TOPOLOGY, ' also polyline layer must be first in TOC. ' ' Limitations: Large datasets take a long time to build the cache and may even fail. ' ' Author: Duncan Hornby ' Created: 11/12/2011 ' ' Get map and then first layer, must be of polyline type Dim pMXDocument As IMxDocument Set pMXDocument = ThisDocument Dim pMap As IMap Set pMap = pMXDocument.FocusMap Dim pLayer As ILayer Set pLayer = pMap.Layer(0) Dim pFeatureLayer As IFeatureLayer Set pFeatureLayer = pLayer Dim pFeatureClass As IFeatureClass Set pFeatureClass = pFeatureLayer.FeatureClass If pFeatureClass.ShapeType <> esriGeometryPolyline Then MsgBox "This code works only with polylines!", vbExclamation, "Wrong data type at layer 0" Exit Sub End If ' Get editor and topology extension Dim pEditor As IEditor Dim pID As New UID Dim pTopologyExtension As ITopologyExtension Dim pTEID As New UID pID = "esriEditor.editor" Set pEditor = Application.FindExtensionByCLSID(pID) pTEID = "esriEditorExt.TopologyExtension" Set pTopologyExtension = Application.FindExtensionByCLSID(pTEID) If pTopologyExtension.CurrentTopology Is Nothing Then Exit Sub ' Get a MAP topology not a geodatabase topology Dim pMapTopology As IMapTopology If TypeOf pTopologyExtension.CurrentTopology Is IMapTopology Then Set pMapTopology = pTopologyExtension.MapTopology Else ' Not a Map Topology Exit Sub End If ' This is the colection that FID are added to Dim aColl As New Collection ' Build cache Application.StatusBar.Message(0) = "Building MAP TOPOLOGY cache, this can take a long time on large datasets..." DoEvents Dim pGeoDataset As IGeoDataset Set pGeoDataset = pFeatureClass Dim pEnvelope As IEnvelope Set pEnvelope = pGeoDataset.Extent pMapTopology.Cache.Build pEnvelope, False ' Identify dangling nodes and add polyline FID to collection Application.StatusBar.Message(0) = "Identifying dangling nodes..." DoEvents Dim pEnumTopologyParent As IEnumTopologyParent Dim pTopologyNode As ITopologyNode Dim pEnumTopologyNode As IEnumTopologyNode Set pEnumTopologyNode = pMapTopology.Cache.Nodes pEnumTopologyNode.Reset Set pTopologyNode = pEnumTopologyNode.Next While Not pTopologyNode Is Nothing If pTopologyNode.Degree = 1 Then ' As this has 1 degree it has only 1 parent polyline Set pEnumTopologyParent = pTopologyNode.Parents pEnumTopologyParent.Reset aColl.Add (pEnumTopologyParent.Next.m_FID) 'Adds polyline FID to collection End If Set pTopologyNode = pEnumTopologyNode.Next Wend ' Use collection to select polylines Application.StatusBar.Message(0) = "Selecting polylines..." DoEvents Dim pFeatureSelection As IFeatureSelection Set pFeatureSelection = pFeatureLayer Dim X As Variant For Each X In aColl pFeatureSelection.SelectionSet.Add CLng(X) Next pMXDocument.ActiveView.PartialRefresh esriViewGeoSelection, Nothing, pEnvelope Application.StatusBar.Message(0) = "" DoEvents End Sub

1 Reply

Hornbydd

Feb 13, 2013 5:51 AM

Hello,

About a year ago I played around with MapTopology to see what one could do with it. The code below is in VBA and shows you how you could identify dangling nodes. The limitation of this method is that it works only when you are in edit mode.

Duncan

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Assign Geometric Network connectivity using ArcObjects

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