OpenStreetMap

MapRoulette destination challenges: success! (and more to do)

Posted by mvexel on 5 June 2018 in English (English)

A while ago I launched a few challenges on the new MapRoulette (new! you should check it out :)) that have to do with motorway exit information in the United States. Lots of exits around here do not have that information, encoded mainly in destination, destination:ref, destination:to and destination:name tags.

A destination being added based on a Mapillary image

These tags are helpful for navigation users, so they can match what they see on the sign to what they see on their app. Many navigation apps, including OsmAnd, MAPS.ME and Scout use these tags.

Obviously, this information cannot be added from aerial images, but now that there is plenty of street level images from OpenStreetCam / Mapillary to choose from, adding destination info as a non-local mapper becomes much easier. That's why I created these challenges.

  • A task from the Connecticut destinations Challenge *

There have been 11 Challenges so far, for 11 different states. 8 of them are done, but you can still participate in the ones for Connecticut (just posted!), Florida and Pennsylvania.

See the wiki on destination for detailed tagging guidance. Happy mapping!

Comment from RobJN on 5 June 2018 at 16:33

Hi Martijn. Do you have any idea what the level of completeness is for the United Kingdom? We are looking towards our next quarterly project (starting July) and one idea is to focus on major road network by adding lanes and exit information. Step 1 is to assess the amount of work required. Lanes don't look too bad (but could probably do with turn info and finishing touches). No idea about our level of exit/destination data. Cheers.

Comment from mvexel on 5 June 2018 at 17:06

Rob, from http://overpass-turbo.eu/s/zmo it looks like you have 11803 motorway and trunk link ways, of which only 282 have destination. This is not a completely accurate picture of the situation (since typically only the first way connecting to the motorway / trunk has destination) but it should give you an idea :)

I don't know if there is an overpass query that only considers the _link ways directly connected to their motorway / trunk counterparts.. Perhaps mmd can say something about this!

Comment from mvexel on 5 June 2018 at 17:11

Additionally, this query counts on- as well as off-ramps. Looking at network connectivity would fix that. Perhaps this query is more easily / satisfactorily solved in PostGIS or some other geospatial database.

Comment from mvexel on 5 June 2018 at 17:14

Also :/ it only seems to count trunk_link... Someone with more Overpass QL skills please say something useful :D

Comment from Carnildo on 6 June 2018 at 00:08

At least in the US, on-ramps have destinations. For example, the interstate near me has signs indicating "I-90 west to Seattle" or "I-90 east to Spokane". See https://www.google.com/maps/@47.393803,-117.8388722,3a,75y,10.56h,88.38t/data=!3m6!1e1!3m4!1s5EaWcp1m5ZYD5zzcXUtKtA!2e0!7i3328!8i1664 for one such sign.

Comment from mvexel on 6 June 2018 at 15:19

Carnildo, yes, I have seen many of those as well. Not everywhere though.

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