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I am getting this warning during the Generate Transit Lines and Stops. Is this what you mean by #2? Warning! Your calendar.txt file(s) contain(s) non-overlapping date ranges. As a result, your analysis might double count the number of trips available if you are analyzing a generic weekday instead of a specific date. This is especially likely if the non-overlapping pairs are in the same GTFS dataset. Please check the date ranges in your calendar.txt file(s). See the User's Guide for further assistance. Date ranges do not overlap in the following pairs of service_ids: (Showing the first 10 non-overlaps) [[u'googletransit:BPPB9-BP_B9-Weekday-10-SDon', u'googletransit:FRPA9-FR_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Weekday-10-SDon', u'googletransit:JKPA9-JK_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Weekday-10-SDon', u'googletransit:SCPA9-SC_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:FRPA9-FR_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:FRPA9-FR_A9-Weekday-10-SDon'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:JKPA9-JK_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:JKPA9-JK_A9-Weekday-10-SDon'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:SCPA9-SC_A9-Sunday-10'], [u'googletransit:BPPB9-BP_B9-Saturday-10', u'googletransit:SCPA9-SC_A9-Weekday-10-SDon'], [u'googletransit:CPPB9-CP_B9-Weekday-10-SDon', u'googletransit:FRPA9-FR_A9-Sunday-10'] Anyway, I realized that I was using the latest Ferry GTFS data with older Bus & Subway and this caused the problem. I started again with all the latest data and it works just fine. Thank you!
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05-14-2019
06:34 PM
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Hello, I have a question in connection with the same project, NYC Public Transit Network. In the image bellow, Stop 1 is in Staten Island (one of the boroughs in NYC) and Stop 2 is in Lower Manhattan. I tried to solve for the route at different start times, as well as days and every time I get a route that takes around 60 minutes. From what I see, it's a combination of buses and express buses. However, I know that the ferry ride is only 25 minutes long yet that venue is never used. The edge appears in the Transit lines layer (green in the second image), so I assume that the ferry service was included in the network. Are there any ways I can check things out? Thank you, Horia
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05-14-2019
09:31 AM
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If I use Default Breaks, the areas closer to the facility are generated with less detail. Can that be changed? I'm not sure what you mean by this. Can you post a screenshot and clarify what polygon generation settings you're using? Here is a service area, Default Breaks 10 min, Polygon type Detailed Here is the same service area, Default Breaks 10 min, Polygon type Detailed, Trim 30 m Here is the same service area, Default Breaks 10,20 min, Polygon type Detailed, Trim 30 m. As you can see the outside polygon (20 min) is indeed trimmed but the 10 min is overly simplified. A workaround would be to create two separate service areas, instead of using breaks. It is not a big difference but some points that are within 10 min travel time will fall under the 20 min area.
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04-05-2019
06:24 AM
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Hello Melinda, Thank you for getting back to me, I'll check those links. As a matter of fact I had, for a while now, a number of questions regarding Network Analysis with GTFS data but I waited to gather more experience and information (including reading your other answers) before posting them. The ArcGIS Pro issue just came up as a requirement to use it for a project, I have been using ArcMap. A little background info: I am ranking sites in NYC using multiple weighted criteria, one of them being proximity to public transit. Originally I approached the issue by creating a 0.3 mile buffer around every site and giving points for how many subway or bus stations are within. Then I started to look into Network Analysis and now I want to use a this workflow/ process. I'm going to break it down for clarity, sometimes is more of a discussion than a question. 1. Do you think it's OK to mix the use of ArcMap and ArcGIS Pro for the same project? Like, to use the best of each. 2. I created a NYC network dataset consisting only of streets and GTFS data, subway and buses (local and express). The resulting file was 1.6 GB! I then played around with it, doing some Service Area and Route Analysis tests. Service Area. In some cases (I created more than one network dataset) there is a discrepancy between the results if I use time (minutes) or distance as Impedance, distance being correct. I might not have set something properly somewhere, I'll go over that again. Any comments regarding troubleshooting? If I use Default Breaks, the areas closer to the facility are generated with less detail. Can that be changed? Route I tried to check the accuracy of the result and I don't know, it's not an easy task. Somehow I thought that one would be able to "see" the route: from point A walk to this bus station, take this bus route to this stop, walk to this subway station, take this subway line to this stop, walk to point B. The route cannot be properly displayed because it follows the created Transit lines. And by using the Network Identify Tool, the result is in "network speak" (Edges 48095 Transit Lines) instead of " subway, Q line, between DeKalb and Canal". How do you visualize the results? Can something similar to driving directions be generated? How much do you trust the results? Changing the location of the stops I occasionally get this message, without an apparent cause: Warning: Location "ABC" in "Stops" is on a non-traversable network element position. Warning: Cannot preserve last location "ABC" in "Stops" because it is invalid. Error: "Stops" does not contain valid input for any route How do I troubleshoot this? 3. Regarding my project, on one hand is the accessibility to public transit which in my case will consist of subway, bus and ferry. This would be answering the question What level of transit service does a site have access to? The other would be to analyze the travel time to major areas like Downtown and Midtown Manhattan, where the majority of people commute to work. I can create a service area with 10 breaks, covering the entire city, with 2 facilities (Downtown and Midtown Manhattan) and than assign scores respective to the area where each site is located. How would you go about it? Thanks again and all the best. Horia
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04-04-2019
10:04 AM
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Hello, I watched and worked along the GTFS tutorials using similar process with different data (NYC) and it worked pretty well. I used ArcMap. Now I am trying to do it in ArcGIS Pro and it's just not the same. I am using the same network dataset created with ArcMap. Should I start from scratch? For example, I have problems with the units, it seems something is not quite there with the cutoffs, when I do Service Area. The Network Dataset Properties window looks only somewhat familiar. Any suggestions regarding the transition to ArcGIS Pro? Thank you, Horia.
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04-03-2019
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