[OSM-talk] Google/OSM comparison - visualised

Gary68 gary at gary68.de
Sat Dec 6 10:46:59 GMT 2008


hi,

still have to look at it because my ubuntu / firefox doesn't run the
media but...

i try to identify unmapped and sparsely mapped places in osm (Germany
for now). the results can be seen here

http://wiki.openstreetmap.org/wiki/Unkartografiert (page is German but
result files are English)

there is also a visualization in a slippy map here

http://www.gary68.de/osm/qa/unmapped/index.php (turn on layers with the
plus and zoom into Germany)

i am running several reports on behalf of osm quality assurance but this
is the most requested data according to the log files of my provider.

cheers 

gary68
Gerhard


Am Samstag, den 06.12.2008, 10:29 +0000 schrieb Steve Chilton:
> I have taken Bernard's original visual comparison (location data) and Alex's scoring (numerical comparison) and produced a map to visualise the results of the comparison.
> The result can be seen at:
> http://maker.geocommons.com/maps/1784
> I have tried to remove any capitals that were mis-placed or incorrect, and obviously am using Alex's somewhat subjective metric.
> The size of the circles are proportional to the values for both, so small is poor coverage and large good. The overlap of the circles shows who appears to be doing better (orangey/brown showing means that osm is doing better, blue google).
> The geo-located data table is available from the link on the site.
> Thanks to the Geocommons Maker! service this was quite easy to achieve, although I would have like to be able to show results on a combined scale from +5 (for osm 5, google 0) to -5 (osm 0, google +5), with 0 for equal, but couldn't find a way of using a bi-polar colour scale for point data in the software (having calculated a new column in the spreadsheet).
>  
> Cheers
> STEVE
> 
> 	-----Original Message----- 
> 	From: talk-bounces at openstreetmap.org on behalf of Edward Johnson 
> 	Sent: Fri 12/5/2008 7:53 PM 
> 	To: talk at openstreetmap.org 
> 	Cc: Alex Mauer 
> 	Subject: Re: [OSM-talk] Google Maps - OSM comparison
> 	
> 	
> 
> 	At CloudMade we have been doing a lot of research and comparison into
> 	the quality and completeness of the map but more focussing on Europe and
> 	the USA. So it is very interesting to see this and see just how far
> 	ahead we seem to be in less developed areas.
> 	
> 	I would be very interested in looking through that spreadsheet Alex,
> 	could you send it over to me. Perhaps I will go through the list myself
> 	and do some rankings and we can compare results.
> 	
> 	Ed Johnson
> 	
> 	talk-request at openstreetmap.org wrote:
> 	>
> 	> Captials in Europe are done very well (Vaduz is an exception)
> 	> >
> 	> > In South America OSM is far behind Google
> 	> >
> 	> > In Afrika the winner is OSM
> 	> >
> 	> > In Asia it's mixed.
> 	> >
> 	>  
> 	>
> 	> I ran through the whole list, ranking the quality of the map for each of
> 	> OSM and Google on a scale of 0-5. (0 meaning that the map is blank or
> 	> only the name appears, 5 meaning that it doesn't seem like anything is
> 	> missing from the map)  Assuming I did a good job of ranking, OSM is
> 	> slightly ahead of Google worldwide and in in Africa and Asia.  In
> 	> Europe, OSM is well ahead.  Google is slightly ahead in Oceania, and
> 	> well ahead in North and especially South America
> 	>
> 	> Here are the results (I can provide my rankings in a spreadsheet as well
> 	> if anyone is interested):
> 	>               OSM     Google
> 	> World         2.64    2.50
> 	> Africa                2.02    1.78
> 	> Asia          2.62    2.36
> 	> Europe                3.90    3.38
> 	> N Am          2.17    2.77
> 	> Oceania               2.19    2.35
> 	> S Am          2.36    3.21
> 	>
> 	> -Alex Mauer "hawke
> 	>
> 	>
> 	>
> 	>  
> 	
> 	
> 	_______________________________________________
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> 	
> 
> 
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