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Japan OSM improvement #120
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Realignment trial report 09/16
Revised data improvement strategy
From tomorrow team-blr will try the above approach and report findings. A log of observations is maintained here cc @mapbox/team-data |
Wow, great progress.
@planemad - what does this concretely mean? Can you give an example for that? |
@lxbarth to be as accurate as possible we were using Strava and OSM GPS to offset the Bing/GSI imagery for the best match, this is never perfect and results in an offset in another area. These continuous localized corrections which cannot be replicated exactly be someone else and adds to the data inconsistency since no source perfectly will match the data everywhere. To make it simple, we're just going to use GSI Satellite or Bing as is without offset correction. We will skip realigning data with offsets under 10m from satellite imagery such as these and focus on adding missing roads. |
I understand all steps. 電子国土基本図(オルソ画像)MaxZoomLv18 We have started special project team on Facebook Group with Asian addicted mappers, OSM teachers in Japan. My students will join. |
Mutsu city area doesn't have good GSI ort images and Strava GPS. std 標準地図 MaxZoomLv18 |
Realignment trial report 09/17
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@mapconcierge, what kind of highway will the below road be? a service road, residential road or a living-street road? https://www.openstreetmap.org/#map=17/40.785891873025996/140.7407283726662 |
Realignment trial report 09/21Today @planemad @pratikyadav @ruthmaben @nikhilprabhakar and @ramyaragupathy realigned 3201 nodes in the Aomori region. The focus under pass 1A and 2 was -
Today under pass 3, the team will realign, merge and add missing unclassified, residential roads, living streets. |
Realignment Summary
Realignment proposal for Japan
cc @mapconcierge @lxbarth @mapbox/team-data |
Since we have Aomori completed till pass 2, the @mapbox/team-data is going to follow the similar procedure in the more dense Beppu-Oita region on Kyushu island from today http://tasks.openstreetmap.in/project/44 @mapconcierge would be great to have the OSM-JP community help with the validation of our work and feedback on the process. |
We already finished http://tasks.openstreetmap.in/project/31#, which is a pilot task for realignment and adding roads in Chiba. Those are the number of editions per user
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Team progress in Chiba Prefecture, Japan. |
@mapconcierge, there is this tunnel like construction, what should it be tagged as? Here is the link to the road. |
Japan realignment progress map https://gist.github.com/planemad/64da69b20ea9705b5673
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@jinalfoflia Coincidentally, I've been through that tunnel many times. It's an enclosed "snow shed"/"snow shelter" (スノーシェッド or スノーシェルター) situated at a mountain pass with hills rising on either side. Here are some pictures of this structure. It seems like the OSM tagging is |
Progress
cc @mapbox/team-data |
@friedbunny Thank you 👍 |
As there are multiple roads for re-aligning, I tend to miss a few of them. To better keep track of the roads that I modified, I use this style that highlights freshness of data.
/cc @mapbox/team-data |
@jinalfoflia nice tip and its always a good practice to upload/download data to keep it in sync. |
@mapbox/team-data : |
@mapconcierge , That is great :) , could you give me your osm users, to add in Task Manager, hmm but I think first you have to login http://tasks.openstreetmap.in/, after it I can give you permission to access. |
> @rub > @lxbarth |
Have filed an issue in iD to prompt alternate imagery based on map location: openstreetmap/iD#2826 This is an important issue to fix if we want new users to trace and realign from the correct source as we cannot expect them to know the availability of GSI and the tileurl. cc @mapbox/team-data |
HUGE! @pratikyadav - we should diary-post this in Japanese and English. Maybe we can get @mapconcierge's help? |
💥 @pratikyadav! |
https://www.openstreetmap.org/user/pratikyadav/diary/36280 |
@pratikyadav I don't know where can I translate the instructions, in a gist or do I have to have access to the task? |
@abel801 you can make a gist, and i'll update them on the task |
@pratikyadav the translation to Spanish is Here |
I've made a Osaka Mega Task now!! Boom! :-) |
Nagoya DONE! 🚀 Next task is Mega Osaka: http://tasks.teachosm.org/project/105 Thanks! @mapconcierge Again, a some reminders when you edit:
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Incredible. |
We are almost done with Osaka. (21% left) We are extending the list of mega tasks to one more by including Hiroshima and thus will be covered with most of the east coast coverage of GSI imagery. link of geojson for Hiroshima task -> https://www.dropbox.com/s/y4l84qw2bjtrlcm/Hiroshima.geojson?dl=0 Next action
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I found this interest area in Nara city in OSAKA mega task. |
> @pratikyadav |
This area is off to the left side over a wide range in Matsuzaka city. |
> @abel801 Excelente!! > @planemad |
@mapconcierge Great 🎉 |
Thanks!! @pratikyadav |
@mapconcierge many thanks for all the help from the Japanese community in the task. We will continue to interact on our diary posts and the mailing lists. No immediate actions here. Amazing job everyone! cc @mapbox/team-data |
@mapconcierge I stumbled across this highway system overlapping water in #103. Since it is related to Japan, I thought you might want to check it out. Should that street network be on top of that water feature? |
Is this project still ongoing? In many cases it's possible to use road-edge data from the Japanese government to guide extremely accurate updates that are not subject to image misalignment or elevation-change skew. I've been doing this around Kyoto a lot, but it'd be nice if more folks could do it. |
There were actually a many roads in this area. When the earthquake / tsunami in 2011 caught here, many of this area, Kamatani and Nagato region, fully submerged. We should mark these roads as non-usable or lost. |
@jeffrey-friedl No, this is not an on-going project. But I would love to learn more about road-edge data from the Japanese government. Can you provide some relevant link? |
You may need to create a (free) account to access this link, but the data is downloadable at: http://fgd.gsi.go.jp/download/kibansel.php It's the "道路縁" field. The data is difficult to work with, but in the end you can turn in into a GPX/KML file that ends up drawing the edges of roads. Using that as a guide, a human can infer road paths. Here's an example that you can load into an openstreetmap editor or Google Earth or other visualizer: http://regex.info/tmp/road-edge-sample.gpx The data is usually very high quality, but occasionally it is out of date due to recent construction. Also, in some areas the data seems more like an old planned road, rather than actual construction. But mostly it's spot on correct. I came across your project because it updated a road I had used this technique with. The project update broke map correctness because the GSI image from which your update was based was old... the road had since been move. (I'm still trying to get that update, changlist #35265050, reverted.) |
Based on observations from #116. There are multiple data issues in japan which requires a comprehensive cleanup strategy with close involvement of the Japanese OSM community.
This ticket will track all the high level conversations and strategy on improving OSM data for Japan.
Existing data issues
Data improvement strategy
Next steps
cc @mapbox/team-data
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