creating a multimodal transport network with overlapping transit routes in UK

Discussion created by arc_angel on May 7, 2010
Latest reply on Jul 19, 2013 by MMorang-esristaff
Good morning,

I am looking into the socioeconomic impact of Edinburgh's old transit system, focusing specifically on the removal of the original electric tramlines in the 1950s, taking 'snapshots' of network catchments before and after the change. I am brand new to Network Analyst and have run into some difficulties and am hoping the forum may have some advice.

My first question is if all of my transit information needs to be in the same feature dataset/ database? I am working both with bus and tram routes that have been digitized and with an ITN road database that has been downloaded from the Ordnance Survey. As there is only one computer on campus that can convert from gz to mdb, and as I've already run into some glitches, I'd prefer to play around with the database that contains this information as little as possible... I'm afraid if I touch it, I'll break it and am even considering barricading out streets that didn't exist yet in my study period rather than deleting them.  One of the IT folks in the department thinks it might be possible to use two databases at once, but I haven't figured out how.

Also, if everything needs to be in the same dataset, will the file formats all have to be the same? I.e. do all they all need to be shapefiles, or all database files, or can they be mixed?

My second- or, rather, third- question has to do with how to integrate more than one overlapping public transit route. I read in a previous forum thread that I could either model each bus route as a separate connectivity set, or use the bus route as an "elevation". I am wondering, then, how I need to code the bus/tram stops? If I have trams 1, and 2 and bus 3 meeting at a single transfer point, what "elevation" coding does the stop get? And then how do they interact with streets which have a boolean coding based on actual elevation?

Thank you for your time and I look forward to hearing from you,