On 23/09/2019 09:14, Volker Schmidt wrote:
every mapper can set his own, as you doe and I do, but this
means that a router has to second guess what people think is
standard use in different countries.
That is exactly how it works.
In general, tagging surface is almost
always good idea or at least nice to do.
But this very unsatisfactory for routing. Two examples:
If I hire a rental car in the US, the contract ays, that I cannot use
unpaved roads.
If I use bicycle anywhere I would like to be able to instruct my
router to avoid unpaved roads.
Ultimately, where information is missing, you as a data consumer will
need to make a decision about whether or not a road is likely to be
paved or not.
Adding a default (even per-country) won't magically make all
non-surface-tagged roads paved or unpaved, and where data has come from
import (e.g. TIGER in the US) or imagery (e.g. many places in Africa,
Australia, etc.*) it isn't always possible to tell what the surface is
when first adding to OSM.
Best Regards,
Andy
* and also some areas in the UK, where data was taken from OS OpenData
before imagery/surveys were available -
https://www.openstreetmap.org/#map=15/53.8724/-1.1287 being one such
example.
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