[Talk-us] Fixing road network in New York — MapRoulette challenge #2

[Ilya Zverev]

Hi everyone,

First, thank you for completing the last road graph challenge! The number of daily matching errors is twice as low, with almost no important breaks. I re-run the next million traces against the validator, and the total number of errors for these is 4.6k — compared to 12k before the challenge was published.

I have made the second challenge — with the same parameters there were only 50 tasks (instead of 260 last time), so I lowered the filtering threshold to get 93. It’s likely some of them are false-positives. But thanks to Jason’s idea, now you can verify each error with OSRM and Mapillary, links to which are included in instructions. Please help completing it:

https://maproulette.org/mr3/challenge/3625 <https://maproulette.org/mr3/challenge/3625>

We’re close to fixing most, if not all, oneway-related errors in NYC. Next week we (Juno) are launching in New Jersey, so hopefully in a month I’ll be back with a challenge for that state. Or even earlier, if the number of errors is higher that we expect.

Andy, you are not quite correct about the source of these road errors. Almost all have been indeed sitting there for years, unnoticed. When there is a changeset introducing errors, we notice and fix it the next morning, since the same validator used for making this challenge is run every night here.

If you are curious, this is a page we got from the validator today:

http://osmz.ru/gv-result-190213.html <http://osmz.ru/gv-result-190213.html>

Thanks and have fun editing the map,
Ilya
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