I’ve been looking at the vehicle positional data for sydney trains recently, and I was wondering where exactly the data comes from (I couldn’t find this information anywhere, I may have missed something)
I’m mainly curious because the accuracy of the coordinates seems to vary quite a lot over a single journey, sometimes being directly in the middle of a track, sometimes slightly off to the side, at stations the position is sometimes reported as being at a point in the middle of the station somewhere, but sometimes at a specific platform (They seem consistent with platforms at Central Station, for instance).
It would be useful for me to know how these coordinates are being generated.
For reference, I’ve been using this tool to analyse multiple coordinates at once: http://www.darrinward.com/lat-long/?id=2007932, so inaccuracies could be to do with that website. The data on that particular page is about 30 minutes of the 10:09 Central to Berowra service.