[OSM-talk] Quality reports of non EU area

Tue Aug 23 07:29:36 BST 2011

I took a look at a bunch of cities around Europe, North America and some 
of Asia.  I convert the OSM data into a compressed vector form that 
scales pretty linearly with node density, way density and POI metadata.  
For these cities, I try to fit as much city as I can into less than 
20MB.  I use Lambert Conic projection to try to reduce the latitude 
spread effect.  Short answer, less data means larger area of city.  
Paris has the highest density in the world (I fit 16 4km x 4km tiles in 
20MB), Boston has the highest density in North America (49 tiles).

You might be able to do the same just looking at the size of the PNG 
tiles at a certain zoom, but PNG tiles will grow in proportion to the 
number of edges in the scene and some ways (like dotted paths and rail) 
would give a disproportionate density.

YVR Vancouver: 1124

http://www.openstreetmap.org/index.html?minlat=49.0000&maxlat=50.1920&minlon=-123.3170&maxlon=-121.9600&layers=B000FTFT&box=yes
SEA Seattle: 495

http://www.openstreetmap.org/index.html?minlat=47.0810&maxlat=48.0000&minlon=-122.7700&maxlon=-122.0000&layers=B000FTFT&box=yes
SFO San Francisco: 297

http://www.openstreetmap.org/index.html?minlat=37.3790&maxlat=38.0890&minlon=-122.6620&maxlon=-122.0090&layers=B000FTFT&box=yes
LAX Los Angeles: 325

http://www.openstreetmap.org/index.html?minlat=33.6000&maxlat=34.3000&minlon=-118.5500&maxlon=-117.7900&layers=B000FTFT&box=yes
PDX Portland, Or: 768

http://www.openstreetmap.org/index.html?minlat=44.8000&maxlat=45.8830&minlon=-123.3850&maxlon=-122.3140&layers=B000FTFT&box=yes
SAN San Diego: 470

http://www.openstreetmap.org/index.html?minlat=32.3570&maxlat=33.3360&minlon=-117.4650&maxlon=-116.6560&layers=B000FTFT&box=yes
YYZ Toronto: 309

http://www.openstreetmap.org/index.html?minlat=43.4250&maxlat=43.9200&minlon=-79.8500&maxlon=-78.9440&layers=B000FTFT&box=yes
YUL Montreal: 1330

http://www.openstreetmap.org/index.html?minlat=45.1230&maxlat=46.1000&minlon=-74.8140&maxlon=-72.7270&layers=B000FTFT&box=yes
NYC New York: 213

http://www.openstreetmap.org/index.html?minlat=40.4660&maxlat=41.0230&minlon=-74.3000&maxlon=-73.7400&layers=B000FTFT&box=yes
ORD Chicago: 423

http://www.openstreetmap.org/index.html?minlat=41.4640&maxlat=42.2800&minlon=-88.1500&maxlon=-87.3630&layers=B000FTFT&box=yes
DTW Detroit: 345

http://www.openstreetmap.org/index.html?minlat=42.0860&maxlat=42.7750&minlon=-83.5870&maxlon=-82.8120&layers=B000FTFT&box=yes
STL St. Louis: 900

http://www.openstreetmap.org/index.html?minlat=38.2860&maxlat=39.2070&minlon=-91.0940&maxlon=-89.4900&layers=B000FTFT&box=yes
DEN Denver: 560

http://www.openstreetmap.org/index.html?minlat=39.4000&maxlat=40.6400&minlon=-105.3500&maxlon=-104.6500&layers=B000FTFT&box=yes
IAH Houston: 405

http://www.openstreetmap.org/index.html?minlat=29.4520&maxlat=30.1270&minlon=-95.8870&maxlon=-94.8630&layers=B000FTFT&box=yes
DFW Dallas: 396

http://www.openstreetmap.org/index.html?minlat=32.6000&maxlat=33.2740&minlon=-97.5000&maxlon=-96.5000&layers=B000FTFT&box=yes
MIA Miami: 493

http://www.openstreetmap.org/index.html?minlat=25.4110&maxlat=27.0020&minlon=-80.5200&maxlon=-79.9960&layers=B000FTFT&box=yes
PHL Philadelphia: 219

http://www.openstreetmap.org/index.html?minlat=39.8000&maxlat=40.2620&minlon=-75.4000&maxlon=-74.7040&layers=B000FTFT&box=yes
PIT Pittsburgh: 673

http://www.openstreetmap.org/index.html?minlat=39.9440&maxlat=40.8850&minlon=-80.5400&maxlon=-79.4000&layers=B000FTFT&box=yes
WAS Washington, DC: 116

http://www.openstreetmap.org/index.html?minlat=38.7000&maxlat=39.1000&minlon=-77.2500&maxlon=-76.8000&layers=B000FTFT&box=yes
BOS Boston: 49

http://www.openstreetmap.org/index.html?minlat=42.2200&maxlat=42.4500&minlon=-71.2300&maxlon=-70.9500&layers=B000FTFT&box=yes
PHX Phoenix: 1693

http://www.openstreetmap.org/index.html?minlat=32.1000&maxlat=33.7500&minlon=-112.5000&maxlon=-110.7000&layers=B000FTFT&box=yes
ATL Atlanta: 227

http://www.openstreetmap.org/index.html?minlat=33.5000&maxlat=34.1000&minlon=-84.6500&maxlon=-84.0500&layers=B000FTFT&box=yes
MEM Memphis: 992

http://www.openstreetmap.org/index.html?minlat=34.7070&maxlat=35.9870&minlon=-90.8280&maxlon=-89.4850&layers=B000FTFT&box=yes
BWI Baltimore: 193

http://www.openstreetmap.org/index.html?minlat=39.0380&maxlat=39.5220&minlon=-76.9150&maxlon=-76.3070&layers=B000FTFT&box=yes
YYC Calgary: 1770

http://www.openstreetmap.org/index.html?minlat=50.7330&maxlat=51.5360&minlon=-115.7110&maxlon=-112.5880&layers=B000FTFT&box=yes
YEG Edmonton: 4790

http://www.openstreetmap.org/index.html?minlat=52.0300&maxlat=54.1800&minlon=-115.3600&maxlon=-112.2300&layers=B000FTFT&box=yes
YWG Winnipeg: 1207

http://www.openstreetmap.org/index.html?minlat=49.4710&maxlat=50.3810&minlon=-98.4500&maxlon=-96.5470&layers=B000FTFT&box=yes
LAS Las Vegas: 3094

http://www.openstreetmap.org/index.html?minlat=35.1200&maxlat=36.5000&minlon=-115.4000&maxlon=-111.5000&layers=B000FTFT&box=yes

LON London: 80

http://www.openstreetmap.org/index.html?minlat=51.3800&maxlat=51.6000&minlon=-0.3500&maxlon=0.1500&layers=B000FTFT&box=yes
PAR Paris: 16

http://www.openstreetmap.org/index.html?minlat=48.8100&maxlat=48.9100&minlon=2.2500&maxlon=2.4200&layers=B000FTFT&box=yes
OSL Oslo: 456

http://www.openstreetmap.org/index.html?minlat=59.4000&maxlat=60.1000&minlon=10.0000&maxlon=11.0000&layers=B000FTFT&box=yes
ARN Stockholm: 457

http://www.openstreetmap.org/index.html?minlat=59.0900&maxlat=59.6300&minlon=17.3700&maxlon=18.6400&layers=B000FTFT&box=yes
AMS Amsterdam: 56

http://www.openstreetmap.org/index.html?minlat=52.2200&maxlat=52.4700&minlon=4.7100&maxlon=5.0500&layers=B000FTFT&box=yes
HEL Helsinki: 188

http://www.openstreetmap.org/index.html?minlat=60.0230&maxlat=60.4290&minlon=24.6000&maxlon=25.2000&layers=B000FTFT&box=yes
FCO Rome: 418

http://www.openstreetmap.org/index.html?minlat=41.3590&maxlat=42.2090&minlon=11.9800&maxlon=12.9350&layers=B000FTFT&box=yes
BRN Bern: 195

http://www.openstreetmap.org/index.html?minlat=46.6780&maxlat=47.2000&minlon=7.0920&maxlon=7.7150&layers=B000FTFT&box=yes
BRU Brussels: 180

http://www.openstreetmap.org/index.html?minlat=50.5160&maxlat=51.0450&minlon=4.1170&maxlon=4.6660&layers=B000FTFT&box=yes
BER Berlin: 90

http://www.openstreetmap.org/index.html?minlat=52.3750&maxlat=52.6500&minlon=13.1200&maxlon=13.6500&layers=B000FTFT&box=yes
HAM Hamburg: 100

http://www.openstreetmap.org/index.html?minlat=53.4200&maxlat=53.7200&minlon=9.7400&maxlon=10.2500&layers=B000FTFT&box=yes
MUC Munich: 90

http://www.openstreetmap.org/index.html?minlat=48.0000&maxlat=48.3000&minlon=11.3000&maxlon=11.7700&layers=B000FTFT&box=yes
CGN Cologne: 120

http://www.openstreetmap.org/index.html?minlat=50.6300&maxlat=51.0900&minlon=6.7900&maxlon=7.2100&layers=B000FTFT&box=yes
FRA Frankfurt: 117

http://www.openstreetmap.org/index.html?minlat=49.9100&maxlat=50.2000&minlon=8.1600&maxlon=8.8000&layers=B000FTFT&box=yes
VIE Vienna: 130

http://www.openstreetmap.org/index.html?minlat=47.9840&maxlat=48.4250&minlon=16.1210&maxlon=16.6260&layers=B000FTFT&box=yes
ZRH Zurich: 115

http://www.openstreetmap.org/index.html?minlat=47.1510&maxlat=47.5630&minlon=8.3500&maxlon=8.7500&layers=B000FTFT&box=yes
CPH Copenhagen: 300

http://www.openstreetmap.org/index.html?minlat=55.3860&maxlat=56.1530&minlon=12.0850&maxlon=12.7220&layers=B000FTFT&box=yes
DUS Dusseldorf: 74

http://www.openstreetmap.org/index.html?minlat=51.3460&maxlat=51.5350&minlon=6.8500&maxlon=7.1350&layers=B000FTFT&box=yes

http://www.openstreetmap.org/index.html?minlat=51.1250&maxlat=51.3550&minlon=6.6900&maxlon=6.9200&layers=B000FTFT&box=yes
STR Stuttgart: 70

http://www.openstreetmap.org/index.html?minlat=48.6590&maxlat=48.9040&minlon=8.9060&maxlon=9.4220&layers=B000FTFT&box=yes
GLA Glasgow: 860

http://www.openstreetmap.org/index.html?minlat=55.7000&maxlat=56.5000&minlon=-4.5700&maxlon=-2.8000&layers=B000FTFT&box=yes

My sample for Asia is a bit weird - these are both city states so 
expanding doesn't make a lot of sense.  Singapore takes 213 4km x 4km 
tiles to total 3.4MB.  Hong Kong takes 503 tiles to make up 4.9MB.

SIN Singapore: 213

http://www.openstreetmap.org/index.html?minlat=1.1340&maxlat=1.5230&minlon=103.4990&maxlon=104.1190&layers=B000FTFT&box=yes
HKG Hong Kong: 503

http://www.openstreetmap.org/index.html?minlat=22.0250&maxlat=22.6930&minlon=113.4950&maxlon=114.5190&layers=B000FTFT&box=yes

My data doesn't include turn restrictions and bus route data so I'm 
blind to that effect on the data.  Because buildings can contain a lot 
nodes, it's possible that cities with a lot of buildings look denser to 
me than others.

John

On 64-07-22 11:59 AM, Martijn van Exel wrote:
> Hi Matthias,
>
> I'd like to see some non-EU quality analysis as well, and I am willing 
> to work on it too. Right now I am just getting settled here in the US 
> and doing some mapping locally, but next on my list is doing some 
> quality analysis for at least some major US metro areas.
>
> If you find anything along those lines that is done already, please 
> share. I have not really looked all that hard but from my previous 
> inquiries into quality analysis, I found most tools / results to be EU 
> based. I would think Cloudmade or MapQuest should have something to 
> say about this - Nick, Ant?
>
> Martijn
>
> On Mon, Aug 22, 2011 at 9:52 AM, Matthias Meisser <digi_c at arcor.de 
> <mailto:digi_c at arcor.de>> wrote:
>
>     Hi there,
>
>     well I'm looking for somekind of research/stats on the quality of our
>     project especially in US or Asian area.
>
>     I browsed the most of the scientific papers at
>     http://wiki.openstreetmap.org/wiki/Research
>     but that ones, that concern the quality (and it's metrics) are mostly
>     focused on the EU area.
>
>     So did I missed something and there is already a report covering diff.
>     metrics of other continents?
>
>     P.S. Yes I know QSMatrix for sure (which is pretty cool), but this
>     doesn't cover non EU, too :(
>     http://wiki.openstreetmap.org/wiki/OSMatrix
>
>
>     _______________________________________________
>     talk mailing list
>     talk at openstreetmap.org <mailto:talk at openstreetmap.org>
>     http://lists.openstreetmap.org/listinfo/talk
>
>
>
>
> -- 
> martijn van exel
> schaaltreinen.nl <http://schaaltreinen.nl>

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