This is a Japanese version of the post by user:PlaneMad - Data issues in Japan
Over the last few weeks, the data team at Mapbox have been investigating the unusually large number of unconnected highways in Japan which otherwise looked comprehensively mapped.
Broken highways in Japan. Bigger circles indicate highways of higher classification
Looking into the data threw up quite a few interesting findings:
Hidden settings in JOSM can be configured directly from the advanced preferences panel. This also gives you access to export and import your configuration profiles.
The panel is hidden by default and is shown as the last option when Expert mode is enabled.
Note JOSM will need to be restarted for any changes to take effect.
Create a simple development environment for your html/css/js projects.
git clone . You want to keep your repositories organised in a common place on your system, maybe ~/GitHub/
Identifying common mistakes made by beginner mappers and knowing ow to fix them is important to improve the quality of the map. If you spot something which needs fixing, send a friendly message on the users' changeset on what was wrong and how it could be fixed. You can use this guide as a reference.
| Issue | Whats wrong | How to fix it | Tips |
|---|---|---|---|
| Overlapping ways |  A linear way goes over itself or another way with the exact same tags (note the arrows on the selected way) |
Delete the overlapping way, make sure there are no gaps or missing pieces left behind. | You can use the JOSM validator to detect these issues |
You can add imagery sources from WMS, TMS or even a scanned map source into JOSM for mapping into OpenStreetMap.
The imagery menu lists common imagery sources that is open to use for tracing for OSM. The most common imagery to use in from Bing which has fairly high resolution worldwide coverage at 30m/px resolution.
| { | |
| "project": { | |
| "type": "task", | |
| "name": "Turn Lanes", | |
| "description": "Mapping turn lanes from satellite imagery", | |
| "doc_url": "https://github.com/mapbox/mapping/issues/153", | |
| "changeset": { | |
| "comment": "Add missing turn lanes from satellite imagery https://github.com/mapbox/mapping/issues/153", | |
| "source":"" | |
| }, |
assembly_constituencies.csv including .csvt headersstateCode = toInt("ST_CODE")stateCode = toInt("ST_CODE")v.in.ogr.qgis as assembly_constituenciesv.clean.rmarea with threshold 10000 : 617 areas of total size 574572 removedparliamentary_constituencies with field PC_NAME : v.reclass complete. 4391 features reclassed.
Create and publish a simple node module
If you have been playing around with the new Mapbox Studio you might be interested to know how to make a custom map with objects of your own interest from OpenStreetMap.
To make the process of creating an updating an OSM based dataset on Mapbox more seamless, I was looking into a command line based workflow that could extract OSM data from Overpass and update a Mapbox hosted dataset in one go.
highway=bus_stop