On Sat, Apr 04, 2020 at 07:31:14AM -0700, Skyler Hawthorne wrote:
Hello, I'm having trouble getting OSM/And to route correctly to a
house inside of a mobile home park. An example route is here (two
random locations, but shows the problem):
https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=37.3968%2C-122.0233%3B37.4078%2C-122.0001#map=17/37.40673/-122.00073
The issue does not seem to be OsmAnd.
I'm using OSMAnd 3.6.3 with the California San Francisco offline map,
last updated at 2020-04-04 05:55 PDT. Although as you can see, it
happens on the standard OSM home page too.
The fact that it happens on the OSM home page indicates a problem with
the OSM data.
The problem is the whole park only has two entrances, the main one
being at 849WC232+95, and a smaller one being at 849VCX3V+8V. The
entire park is walled off, so all routes should go in and out of one
of these two entrances. However, it seems to give up outside the
wall of the park if you give it any destination that's one of the
houses on 10th Street or D street.
If you look at the OSM data for this park, you'll find that not only
is the entrance (Recreation Drive) at West Tasman Driv marked
access=private, but every single road within this park is marked
access=private.
The definition of access=private is here:
https://wiki.openstreetmap.org/wiki/Tag:access%3Dprivate
And the first paragraph explains the issue:
The access=private tag is generally used in combination with the road
network tags to indicate that the road is not to be used by the
general public, and on other facilities. Access is only with
permission on an individual basis.
and a bit further down:
Routing programs are able to detect this tag, and knows to avoid
these roads when routing.
So both the OSM home page, and OsmAnd, are doing exactly what they have
been told by the underlying OSM data.
So the solution would be, assuming the access=private is incorrect, for
you or a local mapper to remove the access=private tags from the
various roads (ways in OSM) that have the tag attached. Then the
routing programs will no longer be told to avoid using those roads, and
should be able to find a route that goes into the park.
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