[Talk-GB] NaPTAN Data

Jay Turner jaynicholasturner at gmail.com
Mon Feb 15 20:34:41 UTC 2021


I have a few questions regarding the 2009 NAPTAN import.

On the wiki <https://wiki.openstreetmap.org/wiki/NaPTAN/Import>it states:

*"The Department required that the official identifier for each feature
("atcocode" in the case of a bus stop) is included in the imported data to
allow the movement of these features to be tracked over time and for
updates to potentially be added in the future. We do have this as a tag on
imported bus stops."*
Sadly, much of the UK hasn't been touched since the NaPTAN data was
imported. (82202 <https://overpass-turbo.eu/s/13Gq> / 230474
<https://taginfo.openstreetmap.org/keys/naptan:AtcoCode?filter=nodes>) 35%
I don't really know how to analyse the data of the other 65% but I'll place
a bet it's not in a great state. Additionally, 95% of all `naptan:verified`
tags are `no`.

*I want to know if it's possible to reimport/mass update NaPTAN data from
the latest set of information*. Additionally, I propose a few extra tags;
 - `source:date=*` with the `ModificationDateTime` field within the NaPTAN
datasets so we have a good idea of when the data was last touched.
 - `public_transport=*` because... well yeah. We have that now. We didn't
in 2009.
 - `unsigned=yes` for bus stops with BusStopType=CUS because it's defined
as *"Unmarked stop (or only marked on the road). Point footprint.".
*Previously,
these stops weren't tagged with highway=bus_stop and I think we should add
those en-mass too. Leaving those tags off has led to confusion with mappers
unfamiliar with NaPTAN and caused the nodes to be blindly deleted or merged
into other objects.

*A lot has changed since 2009, we now have tools to help us find and spot
data issues on the ground such as StreetComplete*. There's a discussion on
GitHub about doing something with these tags to help verify it on the
ground. That can be found here:
https://github.com/streetcomplete/StreetComplete/issues/2566

TL;DR: I think we need to mass update NaPTAN data regularly and use
StreetComplete or MapRoulette to verify the import and reduce the count of
`naptan:verified=no`.

FYI, I think the correct tagging for verified is `naptan:verified=yes` - I
know some people delete the tag.

Thank you for reading my incoherent ramble,
JayTurnr
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