[Talk-us] Cleaning up California FMMP "residential"

[Paul Norman]

Having received nothing but positive feedback I'll put figuring out how to
do this on my to-do list if there are no objections.  I may come back for
more consultation if I feel it necessary after looking at the technical
steps. I won't conduct this edit before Friday at the absolute soonest.

We probably need to have a bigger look at cleaning up California landuse
imports, there is some weird and wrong stuff there, but that's a wider
discussion that doesn't need to stop us from removing the clearly wrong
stuff.

> From: Paul Norman [mailto:penorman at mac.com]
> Sent: Friday, June 14, 2013 3:29 PM
> To: OpenStreetMap US Talk
> Subject: [Talk-us] Cleaning up California FMMP "residential"
> 
> I've been doing some California landuse and have come across a lot of
> landuse=residential imported from FMMP which is clearly wrong. The
> landuse=residential covers entire cities, including commercial,
> industrial, retail, parks, schools, golf courses, airports, and pretty
> much anything within city limits.
> 
> It's hard to be certain because whatever was done doesn't match the
> documentation at http://wiki.openstreetmap.org/wiki/California_Farms but
> it appears that data corresponding to any urban area was imported as
> landuse=residential.
> 
> Given that this is a systemic problem with this imported data and the
> problem originates with the import conversion, I think the best approach
> to fix it is a mechanical edit. Given that the data is 1.5 years old
> without being cleaned up, I believe it is the best option.
> 
> To this end, I propose removing v1 imported ways/multipolygons from FMMP
> with FMMP_modified=no, FMMP_reviewed=no, landuse=residential, and either
> description=other land or description=urban land, starting with ways >
> about
> 500 000 square Mercator meters (exact value subject to change).
> 
> This would be about 750 areas.
> 
> There are about 3000 smaller areas that would need dealing with later,
> but it'd be nice to get the large hard to edit ones cleaned up first.