[OSM-talk] routing across open spaces

[Robin Paulson]

On 1 December 2010 11:22, David Murn <davey at incanberra.com.au> wrote:
> Thats great, what happens if someone traces the park from aerial
> imagery, and doesnt know/care about any of those?  Or for that matter,
> if someone tags it on-the-ground, but doesnt add all the details?
>
> What defautls should routers use?  Should they assume all parks are flat
> and walkable, or should they assume theyre fenced, or that theyre 'stay
> off the grass' or 'stay on the grass' or what?
>
> This is the problem.  A way on the map, shows there is a right of
> passage.  If theres no way in an area, it might mean the area is
> passable, but it might also mean it hasnt been mapped.  Hence, the
> safest option is to not route unless theres a right of way to follow.

your arguments are all true, but they're no different to any other
situation with incomplete data.

and there is no 'should' for routing engines. each engine designer
chooses his/her own method for solving the problem. that's how
free/open works

-- 
robin

http://tangleball.co.nz/ - Auckland's Creative Space
http://bumblepuppy.org/blog/