OpenStreetMap
Because I cannot sign up for the osm wiki, I guess that I will have to suggest it here:
approximate=yes
## to be used when the geometry of the area/line is approximate ## depreciates comment=location_approximate
needs_survey=yes
## to be used when a local survey is necessary
Also, the railway=light_rail needs a “easy key-value” changer like the normal railway=rail…
Discussion
Comment from chillly on 16 September 2016 at 14:10
All measurements are approximate. Everything is open to edit and so may be improved in the future. If you knowingly add something roughly right then a commonly used tag to show that it needs updating is fixme. This works well.
Comment from Yoshinion on 16 September 2016 at 15:09
Duh.
Comment from ff5722 on 17 September 2016 at 13:00
Usually most things that do are not relevant for the renderer are added in either ‘note=’ or ‘fixme=’. Personally I don’t see why that wouldn’t work for this. e.g. ‘note=approximation’
Comment from GinaroZ on 17 September 2016 at 13:51
Yes, use fixme=needs survey instead of creating a new tag - then it will be picked up by QA tools like keepright and osmose.