User:Vibrog
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Vidar Gundersen, located in Asker outside Oslo, 
Norway.
I'm mapping my local area and hiking trails around Oslo, Fredrikstad and Løten.
Rendering
I'm maintaining Mapnik style sheets for rendering (1) a hiking map with trails marked by DNT, (2) a skiing map with cross-country skiing tracks prepared by Skiforeningen, and (3) the screen cartography created by the Norwegian Mapping Authority.
See it at http://www.openstreetmap.no/
Hiking maps for singletrack mountain biking
My main involvement is to map hiking trails suitable for singletrack mountain biking.
Tagging trails:
I mostly use
highway=path (which deprecates highway=footway for rural use) and
highway=track.
I supply extra information with
trail_visibility=*,
sac_scale=*,
trailblazed=yes,
surface=grass,ground,dirt,mud,peet,rock,pebblestone,gravel,boulders,wood,
access=*, (foot=*, bicycle=*)
tracktype=<grade1-5>,
piste:type=nordic, and
information=guidepost.
Tags that classify use of trails for
mountain biking;
mtb:scale=0-5,
mtb:type=crosscounty/allmountain/downhill.
To mark trails that need maintenance; Proposed features/Trail clearing and barrier=windfall
Allow inaccurate mapping, but label shortcomings, e.g.
"I know (but not from looking at a map) there is a trail here, but I have no GPS/tracklog", and
mark such data for validation. Current solutions are using
source=survey, knowledge, extrapolation, Yahoo, Landsat,
fixme=continues, resurvey, stub, position,
note=*,
Proposed features/Internal quality.
See also my notes for a
"WikiProject Norway/Hiking maps for singletrack mountain biking use-workshop".