Latest Contributions by MelindaMorang

What you just said in your last paragraph above sounds very suspicious to me, so I'm inclined to agree that it sounds like an Add Locations problem. Maybe it's a search_criteria syntax problem. Your input: "Streets_Updated_LenMin SHAPE;Streets_Updated_LenMin_ND_ND_Junctions NONE"​ I would have thought that syntax would be okay (because often the semi-colon-separated strings are interpreted the same way as lists in arcpy), although the doc tells you to enter it in as a list of lists. Doc: [["Streets_Updated_LenMin","SHAPE"], ["Streets_Updated_LenMin_ND_ND_Junctions","NONE"]] Maybe try that? Also, are you sure that "Streets_Updated_LenMin_ND_ND_Junctions" is actually the name of your junction source, or is that a typo? Finally, when using search_criteria in Add Locations, you have to put something for all your network dataset sources.  It's unclear what the behavior is if you have, for instance, multiple edge sources, but you only specify the behavior of one of them.  So, are all your network dataset source feature classes accounted for in the search_criteria above?  If not, put something for all of them, and see if that helps. ... View more

Hmm, well, none of that looks problematic. Can you describe the differences you're seeing between the python results and ArcMap?  Is one showing considerably longer distances than the other, or are the results just different all over the place?  Are the results in ArcMap identical each time you run Solve in ArcMap, and are the results in python identical every time you run Solve in python? ... View more

I'm guessing that the problem is most likely one of the following: - In your python code, when you run arcpy.na.MakeODCostMatrixLayer(), you aren't feeding it exactly the same parameters as the layer you have in ArcMap (where many of the parameters are set to defaults).  So maybe you have a different impedance attribute, or some restrictions are toggled differently. - When you add your origins and destinations, maybe the field mapping isn't working the same as it is in ArcMap.  In ArcMap, it's super easy to use the field mapping control on the Load Locations dialog.  In python, you need to use either a correctly formatted text string or an arcpy.na.NAClassFieldMappings() object. I know you can't upload your data, but can you upload a snippet of your python code?  Otherwise, it's virtually impossible to diagnose this problem. ... View more

Hmm, I don't know why things would have changed with an upgrade to 10.3, and it sounds like this issue might be a bit complicated and not resolvable on GeoNet.  I think you would do well to call Tech Support for this issue.  They can look at your data in detail and see if they can identify what's happening. Esri Support ... View more

By the way, from the behavior you are describing with restrictions not being obeyed, it sounds like your network attributes (particularly the restriction attributes) might be set up incorrectly.  Perhaps before deciding for good to use barriers, you should check your attributes to make sure they are correct, in case, even with the barriers, the results might be wrong. If you can further describe the issue you're having and give some details about your restriction attribute, I can try to help you debug the problem. ... View more

It's in the field mapping part (labeled as Location Analysis Properties below).  Did you scroll all the way to the bottom of this window? ... View more

You can download this package of tools from ArcGIS Online to create a network dataset that uses GTFS transit schedule data. http://www.arcgis.com/home/item.html?id=0fa52a75d9ba4abcad6b88bb6285fae1 The download includes instructions on how to set it up. However, you will have to have an editable street feature class that you can use as the basis for your network dataset.  You can obtain streets from your city, county, or metropolitan planning organization, OpenStreetMap, or from Esri's Streetmap Premium product (a newer file geodatabase version rather than the old SDC version you're using). ... View more

What about using census blocks instead of block groups? ... View more

Once the network has been created, you can add it to ArcMap and use the Network Identify tool (on the Network Analyst toolbar on the right side) to click on streets and see which other streets and junctions they are connected to.  The Network Identify window gives you a list of stuff the identified street is connected to, and you can click each one and have them flash in the map.  If roads that look like they should be connected don't show up in this list, then they aren't connected. However, I agree with Chris Donohue that it's better to fix these errors before creating your network dataset in the first place. ... View more

1. What tool or python methods are you using to programmatically create your line segments?  This is a bit outside my area of expertise, but I'm guessing there's some kind of environment settings for the tool you could put into place.  Or perhaps the Snap tool would help? ArcGIS Help (10.2, 10.2.1, and 10.2.2) If you describe your workflow a bit more thoroughly, I can try to help more. 2. Ah, interesting.  As you have discovered, you can't delete the feature class.  You could, however, delete all the features in the feature class (use Delete Rows or an update cursor) and then add the new features to the existing feature class.  Again, this might depend on how you're creating the features. ... View more

You can just set the U-Turn policy of your Network Analysis layer to "Not Allowed".  This is an NA layer setting rather than something you build into your network dataset. U-turn policies—Help | ArcGIS for Desktop ... View more