Latest Contributions by AndresSevtsuk

Hi, I'm running a NA-based arcpy tool, and can't figure out how to tell the code when a user manually cancels the operation in the GUI? If that happens, we want the code to do some clean-up work, but we can't figure out how to let the code know that a user has pressed "cancel". Any thoughts? Thanks, Andres ... View more

Hi, I am trying to make a GUI for a tool that takes the network "Impedance Value" as a value that is 'obtained' from the inputted Network Dataset. That is, I would like to have the "Impedance Value" field in the GUI check what cost attributes the given input network has available, and restrict the options from a drop-down to only those cost attributes. This exact actions is available, for instance, in the "Make OD Cost Matrix Layer" tool,"Make Route Layer" tool and other NA tools. I am unable, however, to figure out what the input parameter field 'data type' needs to be for that to happen. There is no 'Network Attribute' data type offered in the tool properties dialog box. Unfortunately cannot see what 'data type' other NA tools use for the "Impedance Value" field. Help! Thanks, Andres ... View more

Hi all, Using Calculate Locations, how could i avoid generating identical location values for points that all reach the same point on the network as closest? This commonly happens for point instances that are located around a tail-end of a cul-de-sac network segment. I need them to be located at non-identical places on the network due to the way i use them as inputs in another algorithm that computes an adjacency matrix between all instances on the network. In that algorithm i use barrier costs at all points in an OD Cost Matrix to limit the search to only closest neighbors. However, if several points fall in the exact same location, then the OD Cost Matrix won't find them due to the overly high barrier cost. If I could have the Calculate Locations tool generate slightly different locations for all points, we could avoid this issues. Thanks, Andres MIT Urban Studies & Planning ... View more

Hi all, I need to to generate an adjacency matrix for a set of facilities on a network. Then output should be a table where you have the facility ID in the first column, its immediate neighboring facilities in the second column, and the distance between them in the third. For example: 1, 2, 24.06 1, 3, 96.33 2, 1, 24.06 3, 1, 148.79 etc. There is a forum thread on a similar issue from 2008 that resolved the adjacency matrix for the nodes of the network (VB code below). I basically need to do the same thing, except for facilities on the network, not nodes. Is there some ArcObject, similar to 'network forward star', that would get to adjacencies between network facilities? I would ideally like to do this in Python, but VB ok if not feasible. All help appreciated, thanks, Andres Public Sub List_Adjacent_Junctions() On Error GoTo eh   Dim pMxDoc As IMxDocument   Set pMxDoc = ThisDocument     Dim pNLayer As INetworkLayer   Set pNLayer = pMxDoc.FocusMap.Layer(0)     Dim pND As INetworkDataset   Set pND = pNLayer.NetworkDataset     Dim pNQ As INetworkQuery   Set pNQ = pND       Dim pEnumNE As IEnumNetworkElement   Set pEnumNE = pNQ.Elements(esriNETJunction)       Dim pNEdge As INetworkEdge   Set pNEdge = pNQ.CreateNetworkElement(esriNETEdge)   Dim pNEFromJunc As INetworkJunction   Set pNEFromJunc = pNQ.CreateNetworkElement(esriNETJunction)   Dim pNEToJunc As INetworkJunction   Set pNEToJunc = pNQ.CreateNetworkElement(esriNETJunction)     Dim pNE As INetworkElement   Set pNE = pEnumNE.Next   Dim pNEJunc As INetworkJunction   Set pNEJunc = pNE   'here start the code to store the output on a text file   Dim strOutputFile As String   strOutputFile = "C:\my.txt"   Open strOutputFile For Output As #1     Dim i As Integer   Do Until pNE Is Nothing       For i = 0 To pNEJunc.EdgeCount - 1  'For each connected edge...       pNEJunc.QueryEdge i, True, pNEdge   'Get that connected edge       pNEdge.QueryJunctions pNEFromJunc, pNEToJunc  'Get To junction of current edge       Print #1, pNEFromJunc.EID & ", "; pNEToJunc.EID & ","; pNEdge.AttributeValueByName("Length") 'List the adjacency and the edge's length     Next     Set pNE = pEnumNE.Next   Loop   Exit Sub   Close #1 eh:   MsgBox "Error: " & Err.Description End Sub ... View more

Can somebody please recommend a download for a toolbox that can do Centrality analysis on spatial networks in GIS network analyst? Specifically interested in Betweenness centrality and Closeness Centrality, thought other methods would be of help too. Thanks, Andres ... View more