[talk-ph] some osm-ph database stats as 20090211

[maning sambale]

On Thu, Feb 19, 2009 at 9:23 AM, Eugene Alvin Villar <seav80 at gmail.com> wrote:
> I think there's a big caveat to these user stats. I think it only considers
> who last edited the node or way masking the original contributor. Plus,
> deletions, merges, and splits are not considered.

Right, the user tag is only for the most recent contributor editing
the tag/way.  Currently, I can't/won't analyze history of each node.
That's a good indicator to look into, more users editing a node/way
could mean better data accuracy.  Or put it another way, untouched
node/way means the data is accurate already.

Percent of contributions belonging to the top 10 contributors:
nodes: 91%
ways : 94%



> On Thu, Feb 19, 2009 at 1:30 AM, Mike Collinson <mike at ayeltd.biz> wrote:
>>
>> At 11:46 AM 18/02/2009, maning sambale wrote:
>> >His some stats as of 20090211
>> >
>> >Total Ways: 56064
>> >Total Nodes: 588281
>> >Total Relations: 40
>> >Highway length sums (metres):  33456642m (roughly 16% of roads
>> >according to CIA Factbook)
>> >Total number of contributors: 150
>> >total nodes belonging to the top 30 contributors: 580227 (99%)
>> >total ways belonging to the top 30 contributors: 55307 (99%)
>> >
>> >What does this tell me?
>> >
>> >1.  Contributors are increasing (+20% as of 20090114)
>> >2.  Data contributed are also increasing (+5% as of 20090114)
>> >3.  99% of all data are contributed by the top 30 active mappers.
>> >
>> >While we are increasingly becoming popular the number of active
>> >mappers are just a third of all contributors?
>> >How do you interpret the stats?
>>
>> It sounds very encouraging, particularly the number contributors that have
>> at least had a go.
>>
>> Even in the UK, which must have several thousand contributors, I believe a
>> study last year showed that 80% was contributed by just ?40? contributors.
>>
>> If easy to do, it would be interesting to calculate what percentage was
>> contributed by, say, the top 5 contributors.  The lower that figure is, the
>> more folks other than the original core contributors are getting active.
>>
>> Mike
>>
>>
>>
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-- 
cheers,
maning
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