Hi Dave F, I haven’t thought too much about the process at this stage, but I was imagining it would be done mostly programatically as there are 21,000+ (non-destroyed) stations.
However, I was anticipating that there would have to be at least some manual intervention to decide whether OS trig stations near OSM ‘survey_point’s are the same thing and merge the tags. I’m sure some sort of filtering of near-certain, possible and unlikely matches between OS trig stations and OSM survey_points will help, but I’m not convinced that setting a hard limit (e.g. OSM ‘survey_point’s within 5m of an OS trig station must represent that station) will work entirely. If someone created a single CSV of all the triangulation stations *including flush bracket numbers*, perhaps using the data from [https://www.ordnancesurvey.co.uk/gps/legacy-control-information/triangulation-stations] (which I asked OS about [http://wiki.openstreetmap.org/wiki/User:Gregrs/Ordnance_Survey_triangulation_stations/Licence_emails]) the flush bracket numbers could also be checked against any existing OSM ‘ref’s. OS customer services helpfully pointed me in the direction of https://groups.yahoo.com/neo/groups/trigonomy/info as another source of flush bracket numbers, but I haven’t asked them about licensing, nor have I contacted anyone from the Trigpointing website at this stage. Thanks, Greg. > On 2 Sep 2016, at 00:05, Dave F <davefoxfa...@btinternet.com> wrote: > > Could you clarify if by merge/import you mean it to be performed manually or > programmatically? > > Personally I think manually is the way to go, possibly as a Quarterly Project > asimilar to the schools update. Local knowledge will definitely produce more > accurate results. > I'd use P2's Task to save all that panning around. > > Have you been in contact with anyone from the Trigpointing website? > > Cheers > Dave F. > > On 01/09/2016 17:16, Greg wrote: >> Hi all, >> >> Since my last email, I've analysed the relationship between the OS >> triangulation station data and OSM 'man_made=survey_point's in Great >> Britain. You can read about this on my wiki page >> [http://wiki.openstreetmap.org/wiki/User:Gregrs/Ordnance_Survey_triangulation_stations]. >> I believe it may be possible to import/merge this data at some point in >> the future so I'd be grateful if you could take a look. >> >> I have also converted the data into a GPX file with metadata that can be >> understood/displayed by JOSM to allow users to more accurately determine >> the offset of aerial imagery. This can be obtained here: >> [http://gregrs.dev.openstreetmap.org]. >> >> Thanks, >> Greg. >> >> >> On Fri, Aug 19, 2016, at 08:08 PM, Greg wrote: >>> I'm pleased to say that I have had confirmation from Ordnance Survey >>> that their triangulation station data can be used under the Open >>> Government Licence v3. I have documented this on the wiki: >>> [http://wiki.openstreetmap.org/wiki/User:Gregrs/Ordnance_Survey_triangulation_stations]. >>> >>> I will try to look into making this data more accessible to the >>> community so that it can be used to more accurately determine the offset >>> of aerial imagery. I have experimented with this idea around the Rugby >>> area and it seems to work well. >>> >>> I am also in the process of analysing the relationship between this data >>> and the large number of 'man_made=survey_point's already in the database >>> in order to determine whether it might be feasible/useful to >>> import/merge the data. It looks like similar data has been imported from >>> IGN in France. Of course I won't do this until it's been properly >>> discussed. >>> >>> Thanks, >>> Greg. >>> >>> _______________________________________________ >>> Talk-GB mailing list >>> Talk-GB@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/talk-gb >> _______________________________________________ >> Talk-GB mailing list >> Talk-GB@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/talk-gb > _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
