Oh, I only noticed now that you also asked about road classification: OSM-ZA has its own road classification guidelines that you can find here <https://wiki.openstreetmap.org/wiki/South_African_Tagging_Guidelines>.
That said, it's not always possible to follow them strictly: especially in KZN where quite a few roads aren't numbered at all, and it quite often becomes a bit of a judgement call in some cases. --K On Thu, 31 Jan 2019 at 11:08, Kieron Thwaites <[email protected]> wrote: > The biggest issues that I've encountered are: > > - As Gerhardus mentioned, lack of speed restrictions and lane > information on bigger roads. This is where the bulk of my edits happens > (and I use OSM data for routing out in the field purely to pick up areas > where things could be improved), but like all of us, there's only so much > time that we can spend mapping! > - Lack of destination tags, which I've found invaluable for people > using OSM data in GPS applications. I think the main reason why these tend > to be absent is that it requires a lot of effort to go out and physically > survey (it's impossible to get that information via satellite imagery) and > sometimes just as much effort to tag properly (especially once you start > adding information about different destinations per lane, the various > symbols that one can encounter on road signs, etc). Plus, you don't see > this information on map renders, it's only when you're navigating using OSM > data that it becomes useful (but like I mentioned, extremely useful!). For > those interested in helping out here, this guide > <https://wiki.openstreetmap.org/wiki/User:Mueschel/DestinationTagging> > is pretty much my reference on how to do destination tagging (and even > then, I still get it wrong some of the time!) > - Curve resolution. Some early traces from low resolution imagery > have pretty terrible curve resolution. Again, it's something that I've > spent a lot of effort improving in places (see: N2 between Caledon and > Swellendam, the entire Western Cape section of the N9, N12 through > Meiringspoort). Again, low-resolution curves are very noticeable when > using OSM data for GPS navigation. > - Also, I've noticed (particularly in KZN) that some administrative > road references that aren't signed on the ground (e.g. the Pxxx route > numbers) appear either in name=* or ref=* tags, where official_ref=* is > probably a more appropriate place for them. > - Finally, lack of road surface data. I've lost count of how often > routers believe that the quickest route between two places is along a dodgy > unpaved road simply because the road surface in question hasn't been tagged > at all... > > --K > > On Thu, 31 Jan 2019 at 10:42, Gerhardus Geldenhuis < > [email protected]> wrote: > >> The CD:NGI imagery is the official imagery but currently a bit out of >> date. In places Bing should be more up to date and for some locations like >> Cape Town I believe more detailed imagery is available. >> >> The biggest "missing" thing that I have personally experienced is lack of >> speed restrictions and lane information on bigger roads ( highways ) not >> being properly mapped. So it would be tagged as a high way but would not >> contain information about 2 lanes or 3 lanes and offramps/onramps can >> sometimes be inaccurate. >> >> In cities the speed limit is 60km/h unless indicated otherwise as being >> 40 or 50km/h. On highways the speed restriction is 120km/h and on rural >> roads 80km/h unless indicated to be 100km/h >> >> There is also a lot of missing road names. >> >> Regards >> >> On Wed, 30 Jan 2019 at 21:24, Andrew Wiseman via Talk-ZA < >> [email protected]> wrote: >> >>> Hello OSM Turkey, >>> >>> My name is Andrew Wiseman, I work for Apple on the Maps team. My team is >>> interested in doing some work on the road network in South Africa on >>> OpenStreetMap, things like adding missing roads, making sure roads >>> connect properly, fixing incorrect alignments with GPS traces, ensuring >>> road classifications are consistent, and other similar issues. >>> >>> Are there places you know of that need improvement or types of problems >>> you see frequently? And are there any imagery sources you'd recommend, any >>> specific highway classification guidelines you recommend such as the >>> general OSM guidelines or maybe the Highway Tag Africa guidelines, or >>> anything else that might help? >>> >>> We have a Github page here about the project: >>> https://github.com/osmlab/appledata/issues/142 >>> >>> Thank you, >>> >>> Andrew >>> >>> Apple, Inc. >>> >>> >>> >>> Andrew Wiseman | Maps | iPhone: +1.202.270.4464 | >>> [email protected] >>> >>> _______________________________________________ >>> Talk-ZA mailing list >>> [email protected] >>> https://lists.openstreetmap.org/listinfo/talk-za >>> >> >> >> -- >> Gerhardus Geldenhuis >> _______________________________________________ >> Talk-ZA mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/talk-za >> >
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