こんにちは Apologies for writing in English, it will be great if someone can reply with a translation in Japanese that will be helpful for everyone :)
As part of the data team in Mapbox, we have been fixing OSM data errors in many parts of the world using to-fix [1] and we noticed a large number of broken data geometries in Japan which looked very well mapped. On closer investigation we found that most of the map data was from the Yahoo import of 2011 and was not of a very good quality. I have written a summary of the data issues our team found in Japan in a diary post [2]. The post is in English and also requires a Japanese translation. Can someone help? Because there was very little documentation of the Yahoo import in English on the OSM Wiki, we got in touch with Taichi-san who helped us better understand the data problems and how we can start to fix it. Our team of 20 mappers are now dedicated to cleaning up the import data for the last three weeks and have finished realignment of the major highways to the correct position based on GSI ort imagery in an area of 40,000 km2. Our progress is tracked in our mapping repository that Taichi-san shared earlier [3] and I invite the Japan community to review the quality of our work. The mapping operations we are performing: - Realign roads to GSI ort imagery - Realign road junctions with minor roads to correct position - Merge small segments into continuous ways (delete yh:WIDTH tag if required to merge) - Create parallel oneways for divided highways - Create missing bridges and tunnels - Focus on motorways, trunk, primary, secondary roads (pass1) - Focus on tertiary roads (pass2) Based on current progress we estimate it to take 3 months to finish cleanup of pass1 and pass2. And many more months for unclassified and residential roads [4]. You can already spread the word and join the cleanup task for Kyushu Island [5] (instructions available in ja, thank you Taichi-san). We also have a fb group that you can join [6] and can be used to communicate quickly to me and the data team. Please share your ideas on how to make OSM the best map of Japan! The Mapbox data team is ready to support in any way. [1] http://osmlab.github.io/to-fix/?error=unconnected_major#/task/unconnectedmajor [2] http://www.openstreetmap.org/user/PlaneMad/diary/36058 [3] https://github.com/mapbox/mapping/issues/120 [4] https://gist.github.com/planemad/64da69b20ea9705b5673 [5] http://tasks.openstreetmap.in/project/57 [6] https://www.facebook.com/groups/697237443754399/706943709450439 ありがとう, -- Arun Ganesh (planemad) <http://en.wikipedia.org/wiki/User:Planemad> <http://j.mp/ArunGanesh>
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