Re: [OSM-talk] Quality reports of non EU area

Mon, 22 Aug 2011 23:32:38 -0700

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 <[email protected] 
<mailto:[email protected]>> 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
    [email protected] <mailto:[email protected]>
    http://lists.openstreetmap.org/listinfo/talk




--
martijn van exel
schaaltreinen.nl <http://schaaltreinen.nl>



_______________________________________________
talk mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/talk






















					Reply via email to