You are in: Rob's OSM Stuff » UK PRoW » Progress

Public Rights of Way Progress

County Parishes RoWs LTotal Ldesignation Lprow_ref GIS Update
Cambridgeshire 233 4098 3218 km 1343 km 41% 723 km 22% 2018‑07‑23 6m
Cornwall 213 6575 4425 km 344 km 7% 4 km 0% 2019‑02‑01 2w
Derbyshire 278 9834 5208 km 3981 km 76% 395 km 7% 2019‑01‑03 6w
Devon 425 6575 4999 km 3558 km 71% 3451 km 69% 2018‑09‑13 5m
East Riding of Yorkshire 171 1838 1624 km 652 km 40% 35 km 2% 2018‑06‑07 8m
East Sussex 107 7843 3182 km 887 km 27% 129 km 4% 2018‑06‑20 8m
Gloucestershire 266 10008 5510 km 1466 km 26% 193 km 3% 2018‑08‑01 6m
Hampshire 273 7263 4592 km 3877 km 84% 468 km 10% 2017‑09‑05 17m
Herefordshire 246 4556 3479 km 723 km 20% 93 km 2% 2018‑07‑02 7m
Hertfordshire 137 5502 3154 km 2166 km 68% 1337 km 42% 2018‑11‑21 3m
Isle of Wight 20 1438 856 km 862 km 100% 862 km 100% 2017‑07‑21 19m
Kent 62 9706 6883 km 2243 km 32% 1070 km 15% 2017‑11‑01 15m
Norfolk 546 5798 3848 km 3247 km 84% 3239 km 84% 2018‑12‑13 2m
Oxfordshire 322 5986 4231 km 2020 km 47% 557 km 13% 2017‑10‑13 16m
Somerset 341 9787 6146 km 5618 km 91% 5546 km 90% 2018‑07‑10 7m
Suffolk 484 10428 5734 km 2183 km 38% 1943 km 33% 2019‑01‑08 6w
Warwickshire 18 3294 2835 km 1904 km 67% 838 km 29% 2017‑10‑23 15m
Worcestershire 198 15692 4590 km 2303 km 50% 1380 km 30% 2018‑07‑13 7m

Note that the "Ldesignation" lengths are only approximate (and will normally be an over-estimate) as the tool does not check precise parishes for ways with a designation tag but no prow_ref tag. Consequently, it includes any OSM ways of this type that fall within the rectangular boundaing box of each parish, rather than just those that are contained within the parish boundaries.

About this tool

This tool takes information about Public Rights of Way from four sources and flags up possible errors / omissions / things to check. Currently only a handful of counties are available, but hopefully more will be added in due course. The data sources are:

  1. Official GIS data from County Councils. Many councils now have digital versions of the legal 'Definitive Map' document they are obliged to maintain. Many have made their data files available fir re-use under a suitable licence (see my open data page). Vector routes, path numbers, designations, lengths and bounding boxes can be extracted automatically from data files. I've started using the files from Barry Cornelius's rowmaps for this, as Barry has already done the hard work in converting the myriad of different formats from the councils into a standard KML format.
  2. Volunteer-Mapped data from OpenStreetMap. Path numbers, designations, lengths, bounding boxes, last update details, etc. can be extracted automatically on a parish by parish basis using the XAPI. The tool will extract all ways with a prow_ref=* tag within the parish's bounding box. The data from OSM is updated on a rolling basis with each parish getting an update roughly once a week. There is a button at the bottom of each parish page to request a quicker update.
  3. Definitive Statements. These are written documents providing textural descriptions of each Public Right of Way. Some councils have only paper records, but many now have digital versions. Sometimes these are unstructured formatted text documents (and so data needs to be manually extracted) but other councils have databases or spreadsheets (which allow automatic extraction of route numbers and statuses.
  4. Manual classification of OSM completion level. This would be entered by tool users, after comparing the official data with the current mapping in OSM.

I've got scripts to do the extraction from first two sources set up, but I currently have to initiate the updates manually. I can do the third and fourth behind the scenes, but eventually the plan is to have a public Web interface.

With the data the tool can then flag up issues such as:

The tool is currently under development, so various key bits of functionality are not implemented yet. For details see the Known Issues and To Do List.

Suggested uses for OSM Mapping

However, please do not use the PRoW GIS data alone to map routes in OSM. The data may not be completely accurate or well-aligned, and it is important that we capture the physical presence and accessibility of routes on the ground too. Simply copying the Council's GIS data into OSM adds very little to the map. Correctly mapping a path with the condition of the surface, adjacent hedges, gates and stiles is much more useful. See also my advice for routes not following the definitive line.

Adding new authorities

I intend to add more areas as and when I have time to do so. The main constraints though are having access to the data and it being available for re-use under a suitable licence for use in OpenStreetMap. The basic requirements are:

It is also useful if the authority makes available its Definitive Statements, List of Streets and a list of Traffic Regulation Orders affecting Public Rights of Way. See my Council PRoW Open Data page for an incomplete list of what is available from each authority.