[OSM-ja] Yahoo data cleanup

Arun Ganesh arun.planemad @ gmail.com
2015年 10月 12日 (月) 10:35:51 UTC


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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