[OSM-ja] Yahoo data cleanup

[Douglas Perkins]

>   * Has the import data helped Japan map to improve and the community
>     to grow? How is the OSM coverage compared to other maps?
>
I remember before we got the Yahoo/ALPS data.  For most of the country, 
there were very few roads mapped.  You couldn't navigate using OSM back 
then, except maybe in a few cities.  Once the import happened, you could 
navigate well, and you still can.
>
>   * How to best cleanup the import: continue to leave the data as is?
>     do a partial revert to make it easy for new mappers? Organize a
>     nationwide mapping movement?
>
To me as a mapper, importer, hiker, and motorcycle rider, the most 
notable thing about the imported data is that in some areas it's 
inaccurate by 10-50 meters in some direction.  The roads described 
mostly exist, though.  What I do to improve things is make tracks when I 
travel, so I can fix the road, or if I have a track to properly align 
some overhead photography I can use that to adjust other roads in that area.

I can't see how a revert has any real value.  It would destroy much of 
the great work the community here has done in the last five years.  And 
it wouldn't help new mappers.  Indeed, if you take a usable map, remove 
lots of data, and then say "go fill in the blanks", people will see all 
the blanks and go look for a different map.  (But since that seems 
really obvious, perhaps I have misunderstood the intent behind some of 
the previous posts?  Feel free to correct me should that be the case.)

Removing data like erroneous road width makes good sense.  Also coming 
from the Yahoo/ALPS import, many rural roads are classified as 
"residential" when they are more likely "track" or "unclassified" or 
"tertiary".  That would be nice to fix.  I imagine surveys are the best 
way, albeit time consuming.
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