[Tagging] highway line representation

[Alex]

My question is mainly related to areas where high-resolution external
data sources (aerial photos, geodetic survey data) are available, as is
the case in some cities or countries. Here where I map (Berlin,
Germany), for example, there are very well georeferenced aerial images
and official government geodata under an OSM-compatible licence every
year, so the precision here tends to be in the decimetre/centimetre range.

Alex


Am 26.12.20 um 10:11 schrieb stevea:
> I’d also say “center of the carriageway,” as that’s how I map things as I see them in aerial imagery and/or as I map them from GPS tracks.  I do feel like what you are asking is at the 2 to 5 meter accuracy / precision of my GPS device (which IS, after all, 15 years old, though a Garmin GPS 60 CSx does have darn good accuracy, being a 12 or 16 channel device — I’d have to check my user manual).  But if, in 2020, that is a good question because we’re “down to” 1 or 2 meters of resolution (individual lanes) on “today’s devices," then “that’s a good question.”
>
> Unless there are very carefully crafted lanes tagging (and maybe even if there ARE!) I’d say “centerline” is a good choice going forward for most or all roads which are now single carriageway.  Dual carriageway?  We might want to get more specific.  At some point where we might want to map individual lanes as individual ways (we already start to do this with dual carriageways and slip_roads) we could assign greater granularity “lanes” tagging that go down to the 1-to-2 meter resolution.  I think that as of 2020 (and almost 2021), “we are about there,” and perhaps this is a very topical subject with “today’s” resolutions of mapping.
>
> SteveA
>
>> On Dec 25, 2020, at 3:17 PM, Alex <supaplex at riseup.net> wrote:
>>
>> Is there actually a consensus on whether a highway line should always run in the middle of a road - i.e. represent the road as a physical object - or whether it should rather follow the line of travel of the vehicles on the road? The driving line of the vehicles can differ from the centre line due to various circumstances: e.g. due to (structurally created) chicanes, but also, for example, due to parking lanes with parked vehicles...
>>
>> It seems to me that there are two possibilities: Either the highway line represents the roadway itself, or it represents the line of travel (and is thus in a sense a routing aid). I have uploaded a graphic here to illustrate the problem: https://wiki.openstreetmap.org/wiki/File:Highway_representation.png
>>
>> According to which of these variants must/could/should one map?
>>
>> Alex
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