[OSM-talk] OSM data density - top regions

[Kate Chapman]

I apologize to all, I forgot the appropriate link to the task:
http://tasks.hotosm.org/job/9

-Kate

On Sun, May 27, 2012 at 5:56 PM, Kate Chapman <kate at maploser.com> wrote:
> The one in Indonesia is the work of human mappers. There has been an
> effort going on to map all the buildings in Padang for the past 9
> months or so.
>
> It does look like some cleanup does need to be done of the area due to
> some duplicate nodes and other problems. But overall I think it has
> been a really great effort of a lot of folks to help.
>
> If you look at HOT's Tasking Manager you can see there is a large area
> that has been worked on that is almost finished. It is an area HOT
> bought high resolution satellite imagery for through a grant.
>
> -Kate
>
> On Sun, May 27, 2012 at 5:30 PM, Frederik Ramm <frederik at remote.org> wrote:
>> Hi,
>>
>>   if you render the world on zoom level 16, there are 67 million "meta
>> tiles" (each covering an area of 8x8 tiles). The majority of them are in the
>> sea, obviously, and unlikely to have any data. 20 million meta tiles are not
>> in the sea; of these, 4.4 million have at least one node.
>>
>> As of 27th May 2012, only 142 of these meta tiles have more than 100,000
>> nodes on them; the front-runner has a whopping 227,000. 105 are in France,
>> 26 in the US, 3 each in Italy and Brazil, and one each in Spain, Japan,
>> Denmark, Austria, and Indonesia.
>>
>> This count is a side effect of something else I was doing and I apologise
>> for not making a proper map of it; I've only dumped and reverse-geocoded the
>> top 142 regions:
>>
>> http://fred.dev.openstreetmap.org/density/
>>
>> I'd be interested to know how many of these are actually the work of human
>> mappers. Most of the French ones are probably imported buildings, but the
>> others?
>>
>> If anyone wants to do something interesting with it, the full file of all
>> 4.4 million metatiles and how many nodes on them is available on request (or
>> the rather primitive script that makes the list from a planet file).
>>
>> Bye
>> Frederik
>>
>> --
>> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
>>
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