Latest Contributions by MelindaMorang

Unfortunately, there's no way to solve this all in one go. You'll have to run multiple analyses, as you've suggested. ... View more

Are you just trying to read a value from the RoadsClipped attribute table and use that to derive the cost?  If so, you don't need a Script evaluator.  You can use a Field evaluator.  Like with script, click on Evaluator Properties to open up the dialog where you can set up some pre-logic script code. This was your python example from before: def SetCost(value):     a=Edge.AttributeValueByName(value)     c=0     if l!=0:         c=100/a     return c value=SetCost("SPEED_LIM")‍‍‍‍‍‍‍‍ Note that for a field evaluator, you do not need Edge.AttributeValueByName(value).  In this case, "value" will be the field value read from the RoadsClipped attribute table. So, let's just say the speed limit is 30, as an example.  You don't need the "a" variable at all.  You can just use "value". def SetCost(value):     c=0     if l!=0:         c=100/value     return c value=SetCost("SPEED_LIM")‍‍‍‍‍‍‍ What is "l"?  I think this is where your problem lies.  As Dan says above, this variable isn't defined. ... View more

I can't see the screenshots, either.  Only the first one with the connectivity policy. ... View more

Okay, there's a lot of stuff going on here.  Let's try to break it down into little pieces. 1) Streets_UseThisOne: This feature class is just a copy of whatever original street features you put in in Step 2, with some vertices added.  So, what you need to do is to find a reliable feature class of streets for your area of interest.  If your original streets were junk, then Streets_UseThisOne will be junk, and your analysis won't be very good.  You might be able to find some good street data from the City or other sources, or you could download OpenStreetMap data (which often needs to be cleaned up a little to make sure everything is well connected). 2) Transit lines don't follow the streets: That's correct.  They're not supposed to.  The TransitLines represent straight-line connections between directly-connected stops and do not attempt to mimic the actual geometry of the routes.  So, don't worry about this. 3) Stops not connected to the correct streets: Unfortunately, this is a common problem.  The GTFS data contains a simple lat/lon value for each stop and my Step 1 tool just sticks a point in that location.  Step 2 has to snap the stop to a street feature so that the transit stuff will be adequately connected to the streets.  I have no information to work with besides the lat/lon of the stop, so it just snaps to the closest street feature.  Sometimes this isn't the actual street where the stop is located but is instead a side street.  Sometimes this is because the original lat/lon was a bit off, and sometimes it's because the side streets are narrower than the main street, so the stop just falls closer to the side street's centerline.  You CAN edit the transit stops and lines after running Step 1, but you have to make sure that the transit lines still connect to the stops.  What might be easier is to download the Edit GTFS Stop Locations tool, update stop locations that way, and then start your network dataset creation process over again with the updated GTFS stops.txt file.  But that could be a lot of work. I don't quite follow what you're talking about regarding the basemap.  Hopefully the basemap is accurate, but I can't be completely sure.  It might also show station entrance locations (any given station could have several), and GTFS doesn't always have the entrance locations, unfortunately. 4) I don't follow what you're talking about regarding the restaurants. ... View more

If you're unsure of how to run a Service Area analysis, I suggest you run through this tutorial: Exercise 5: Calculating service areas and creating an OD cost matrix—Help | ArcGIS Desktop  Actually, this is a particularly good tutorial for you because it also covers the OD Cost Matrix analysis, which might be more appropriate for what you're trying to do.  I can't tell for sure what you're trying to do, but if you're trying to identify restaurants within a certain travel time of school, then using OD Cost Matrix is more appropriate than calculating a Service Area and then finding which restaurants fall inside the polygons.  OD is more exact. I think what you're asking in part is how you do one analysis for just walking and another analysis for walk+transit.  One way to do this is to create a separate WalkTime attribute where transit lines are forbidden (just use -1 in both directions for the evaluator).  Or, if you turn the time of day off and just use your transit travel time attribute, it effectively does the same thing because the transit lines won't be used unless a time of day is specified. ... View more

Yeah, this sort of thing was kind of messy before I implemented the installer (just under a year ago).  So, if you had an older version, it's not surprising that there were weird conflicts with the toolbox location and possibly the evaluator reference in the registry.  Sounds like you've got that part working, though.  Phew! ... View more

Sorry it's taken a while to get back to you.  Did you ever get this to work? To answer your original questions: 1. If the network dataset template support add attributes by edit the xml? ^ Yes.  You can edit the XML template. 3. If so, what’s right way to edit the xml. ^ You should be able to edit it in any way you want, with a text editor manually, with some automated procedure, etc., as long as it remains valid. The original XML template uses single quotes.  I don't know if it makes a difference, but it seems like it would be safer to keep it the same as the original.  Additionally, I notice that the SpatialReference tag and various other place in the original uses ", but your new template uses an actual " character.  This could be a problem also.  Try using WinMerge to see the differences between the two files.  I really don't know whether this matters, but these differences obscure the actual intentional changes you made, so it's hard for me to find them and see if there is a mistake somewhere there. ... View more

How do you know the Service Area is only 1 mile from your facilities?  Is it exactly 1 mile, or just approximately.  Might be helpful for you to post a screenshot. Since you said you left most of the network dataset settings as default, I'm guessing there's a problem with the way your Length attribute is configured.  You should open up the Evaluators dialog for that attribute and make sure it's configured in a sensible way.  See Types of evaluators used by a network—Help | ArcGIS Desktop to understand more about what evaluators are and how they should be configured depending on your desired outcome. The other possibility is that your network's connectivity isn't set up appropriately for your data.  You might need to switch your connectivity policy from End Point to Any Vertex.  See Understanding connectivity—Help | ArcGIS Desktop  ... View more

That appears to have worked correctly.  Have you tested your network again yet?  Does it work now? In case it's not working: Did you by any chance previously have a different version of ArcMap installed on this machine and an older version of the transit evaluator registered/installed with it? ... View more

Since you got the FDO error with the negative number, it means that the transit evaluator did not "register" properly during installation, so probably there's nothing wrong with your gdb, and you don't need to share it.  We just need to figure out why installation didn't work properly. Are you using the latest version of the Add GTFS to a Network Dataset toolbox (ie, downloaded within the last month or two)?  http://arcg.is/10jXez  If not, please get the latest and try reinstalling. If so, try uninstalling (there should be an item in your Programs and Features Uninstall a Program thing).  Then try reinstalling.  When the installer finishes its business, expand the message window, right-click, and choose Copy, and then tell me what it says.  I'm guessing there's an error in there somewhere. ... View more

Your data's projection shouldn't matter. When you say you "can't open the network in ArcMap at all", did you get a pop-up message with an FDO error with a negative number?  If not, what are the symptoms? Possibly something didn't work right when you installed Add GTFS to a Network Dataset, and this makes it so that you can't open the network dataset that uses the special transit evaluator.  However, it's pretty hard to tell.  Would you be able to share your geodatabase so I can take a look?  The best thing to do is to zip the .gdb into a zip file and post it on a file sharing site and send me the link. ... View more

I'm glad it worked, although I can't necessarily explain why.  Post again if you encounter further problems. ... View more

Just checking in.  Did you ever get this to work? ... View more

Did you test the original network, before you made the template and the modifications?  Did that network work? You said the solve failed with the new network.  What was the failure message?  This will likely give some clue about why it failed. ... View more