Latest Contributions by DuncanHornby

Personally I would convert the text files to dBase or better still a GeoDatabase Table as then your data is in a Table which will make joining easier. ... View more

Another way to release cursors is using the USING statement and ComReleaser. See the VB code below ' For ArcGIS 10 using VS 2010 you need to import the following Imports ESRI.ArcGIS.ADF.Connection.Local Imports ESRI.ArcGIS.ADF Dim pQueryFilter As IQueryFilter pQueryFilter= New QueryFilterClass pQueryFilter.WhereClause = "ID = 1" Using releaser As New ComReleaser     Dim pFeatureCursor As IFeatureCursor     pFeatureCursor = pFeatureclass.Update(pQueryFilter, True)     releaser.ManageLifetime(pFeatureCursor)     Dim pFeature As IFeature      pFeature = pFeatureCursor.NextFeature     While pFeature IsNot Nothing         ' Do something with pFeature         pFeatureCursor.UpdateFeature(pFeature)         pFeature = pFeatureCursor.NextFeature      End While End Using Duncan ... View more

Szymon, It's been a long time time I've programmed a geometric network so I may be wrong here but I don't think you can mix M values with a geometric network, thats a linear referencing thing? If your trace is returning a valid solution you can then enumerate the results using the Interface IEnumNetEID and build a polyline. You could then use the IMSegmentation3 Interface (once you made the polyline MAware) to calibrate M values to it. Then using the QueryPointAndDistance on the IPolyline interface you could "snap" your points to your measured trace polyline. Duncan ... View more

Unless I'm wrong I've always understood that a FeatureLayer can only have 1 selection, therefore what you are asking is not possible. An off the top of my head idea is: You could try creating a field and update that to indicate the first selection. Create a second field and update that with your second selection. Combine the values into these 2 fields into a third field and symbolize based upon the third field? Duncan ... View more

You would do something like: Dim pPolygon as IPolygon pPolygon = new polygon Dim pPointcoll as IPointCollection pPointcoll =pPolygon Creat your points: dim pPoint as IPoint pPoint = new Point pPoint.x = 1 pPoint.Y=1 Then you add your points to build the polygon: pPointcoll.Add(pPoint) Duncan ... View more

Samantha, The short answer is no. But you can vote for changes in ArcMap on their ideas website. This is the place to suggest tweaks, improvements or in this case just go back to the old school way of doing it. As you have discovered new is not always better... This is indicated by nearly 2000 people voting on getting the old easy to understand tool back, so go here and vote on it! Duncan ... View more

Bruce, Don't know if I am giving you a red herring here but the IGPUtilities Interface has some methods like ReleaseInternalTable and ReleaseInternals try calling these after you have deleted the in_memory workspace. Below is some code I just knocked together in VBA. Duncan Public Sub DeleteTable()     ' Create Utils object   Dim pGPUtils As IGPUtilities     Set pGPUtils = New GPUtilities        ' Create GPValue object and set path   Dim pGPValue As IGPValue     Set pGPValue = New DETable     pGPValue.SetAsText ("in_memory\abc")        ' Delete table   pGPUtils.Delete pGPValue     pGPUtils.ReleaseInternals End Sub ... View more

Sui, You should mark this thread as ANSWERED, this helps others. Duncan ... View more

If you have a field that has the same name as the shapefile then you could alter the query to this: desc = gp.describe(fc)  query = "\"%s\" = 'S'" % desc.baseName So if your Shapefile is called C1234.shp then the query string will end up being query = "C1234" = 'S' Duncan ... View more

Abby, Interesting that link has stopped working, I always double check those sort of things, as there is nothing more annoying than a broken link! It looks like ESRI are removing ideas off the website, may be when they are a bit unpalatable for them? You might need to go into your forum profile settings and tick some box on to get the emails, can't remember or its your spam filter blocking them? I did test the behaviour of SelectByLocation and SelectLayerByLocation on a small dataset (if you consider 38,000 polylines small) and experienced no difference in selection count. It looks like there is something fundamentally different between the two tools as alluded to by curtvprice. You should bring this up with their support and they will probably want some of the data to try and replicate it. One last idea (which won't fix the problem but may indicate which one you have more faith in) is to create a buffer layer from your points and use those instead of doing a within distance selection. You'll have a defined geometry which you can see rather than some black box processing done by the tool... Good luck! Duncan ... View more

This line is: query = "\"%s\" = 'S'" % field.Name is failing as you do not declare what field is. But in your reponse you say the field names are C5738 and C9875. If you know them then your query could be simplified to: query = "\"C5738\" = 'S'" But there is a question about your logic as you give TWO field names, which one do you want to process or do you want to select all records where both of those fields equal S? If so the query statement should be: query = "\"C5738\" = 'S' OR \"C9875\" = 'S'" Duncan ... View more

Jenna, A quick google search threw up this thread... Duncan ... View more

Yiman, Next time you upload your code please place it in the code (#) tags as it makes it easier to read. You've lost all your indentation... This is particularly important if the code is Python. ... View more

Sui, If your underlying polyline layer was a PolylineM featureclass then you could have used the IMSegmentation3 interface and the GetMsAtDistance method. So you have 2 options: Do it the way you said, nothing wrong with that. When you identify the polyline that the point intersects take a copy of that polyline and turn it into a polylineM feature using your start and end values by using the CalibrateByMs method of the IMSegmentation3 interface. Duncan ... View more