On Thu, 13 Jan 2011, PJ Houser wrote:
Hi all,
In Portland, Oregon, the region's transit agency Trimet (http://www.trimet.org)
is
transitioning to an open-source trip planner (http://maps5.trimet.org/otp/).
The trip planner
will use OSM data for a multi-modal approach - walking, biking, driving - and
Trimet's route
data. However, Portland data is not accurate enough nor complete enough yet in
OpenStreetMap,
so my job is to help fix that with Trimet and the community. The roads are
often incorrect or
do not intersect properly, making consistently good routing impossible. Bike
routes and
off-road trails are seriously lacking.
Recently, local datasets (http://www.civicapps.org/) have been made public
domain, and Trimet
would like to update Multnomah County and Clark County's streets using Metro's
(the regional
agency) data. I'd love your input. We have a shapefile of all the streets along
with basic
attributes, sufficient for routing. I've started learning about bulk imports,
but I don't want
to overwrite the community's input, particularly special tags or attributes
that Metro's data
does not contain (like surface).
Questions:
1) How do you feel about some kind of automatic editing or (selective) import?
Other methods?
2) How do I go about doing that? (I heard of something called RoadMatcher)?
RoadMatcher is a plugin for the OpenJump GIS system (www.openjump.org) that
was designed to take 2 datasets containing road networks and identify which
roads in each really represent the same road.
I used Road Matcher for the GeoBase imports for Ontario and Alberta in
Canada. I found RoadMatcher was very good in telling me if a road in the
Geobase data was not already in openstreetmap. It did much worse trying to
match up existing openstreetmap roads with the geobase versions. The
Geobase data was broken down to having a line segment between each
intersection. Openstreetmap ways often spam many intersections and thus
would cover many road segments. RoadMatcher seemed to have a harder time
dealing with this.
You might have some luck using roadmatcher to identify the really bad roads
in OSM that you can then manually go in and adjust but putting both
roadnetworks as layers in JOSM but turn out to be just as effective.
3) Any other input?
I also posed these questions to the talk-us list.
And for fair warning, I will soon be writing you all about importing bike
routes (as relations)
and off-road trails. Both bike routes and off-road trails are lacking in the
Portland area and
there seems to be less risk of erasing users' work (as there isn't too much
yet).
Thank you for any help or input you can provide.
--
PJ Houser
Trimet, GIS
[email protected]
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