[Talk-GB] TfL Cycling Infrastructure Database

Jez Nicholson jez.nicholson at gmail.com
Wed May 15 07:20:41 UTC 2019


If Martin comes to the OSMUK AGM he could do a talk and/or we could host a
discussion.

Regards,
              Jez

On Tue, May 14, 2019 at 10:11 PM Rob Nickerson <rob.j.nickerson at gmail.com>
wrote:

> Hi Martin, Hi all,
>
> -- Second attempt to send this mail, this time with attachments hosted on
> cloud (feel free to copy to OSM wiki)
>
> Good to see the TfL project moving forward. As background for those that
> were not aware, Transport for London first approached the OpenStreetMap
> United Kingdom community interest company towards the end of 2018. We met
> them twice and helped them to scope out the project that Martin has now
> picked up via the OSM UK Talent Directory [1].
>
> I realise in my email to this list in March I promised some more
> background (beyond what had gone into the board meeting minutes, here and
> on Loomio). I'm not sure I delivered on that promise - March and April is a
> blur in my memory as work was non-stop.
>
> I think the easiest way to rectify that is to share the text from the
> tender document (see [2]). I also attach the slides from the second meeting
> we had with TfL.
>
> One key extract from that document relates to the desire to investigate
> how best to integrate this data into OSM. As noted although it is possible
> to add the CID data to OpenStreetMap using the standard editing tools
> alone, this was identified as a potentially undesirable solution (to be
> explored as part of this project) due to the long time it would take and
> the difficulty of ensuring all data is added. I for one look forward to
> seeing what Martin discovers as part of the project. I have a small bit of
> experience using Ilya's conflation tool, but the earlier Potlatch2 merge
> tool (used on England cycle data) was before I joined OSM. Keen to find out
> what the current best practice is.
>
> The other key extract is related to how the data was collected:
>
>    - The first phase of the project involved the surveying of greater
>    London that was split into 25 data packages, 13 in Inner and 12 in Outer
>    London. A total of 23,728 km of public highways was surveyed as part of
>    this project. More than 30 surveyors have been on site 7 days a week to
>    record all cycling infrastructure currently in place and over 477,000 asset
>    photographs were captured.
>    - 203,900 points and 34,931 individual lines were captured. The linear
>    features cover a total distance of 2,088km (1 1⁄2 times the length of
>    Britain).
>    - Two photographs were captured of every asset.
>    - Checking and correction has been undertaken to ensure that the
>    quality of the data met the 95% thresholds agreed with TfL.
>
> The approach of ground survey data collection, along with the photographs,
> is essentially the same as we do. I think this has helped to ensure that
> the data collected is of high quality and accuracy (unlike some other open
> data we have seen in the past which may have been poorly digitised from
> within the office).
>
> It would be great if we can all take a moment to look at the data,
> consider the options for getting it in to OSM, and share feedback here for
> Martin to capture within the project :-)
>
> P.S. Whilst this one is London based, the learning from it is valuable to
> OSM UK as it ticks of some of our aims (increasing the amount of quality
> data in OSM and promoting the release of open data). What we learn here can
> be applied to projects as and when then come up throughout the UK, IoM and
> CI.
>
> Thank you,
> *Rob*
>
> [1] https://osmuk.org/join-our-talent-directory/
> [2]
> https://drive.google.com/drive/folders/1K3MQtV4-4Kl_ewrLB2lmvV3tnYyYjXpM?usp=sharing
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