[OSM-dev] Size of tiles

Jukka Rahkonen jukka.rahkonen at latuviitta.fi
Tue Jul 2 07:15:59 UTC 2013


Hi,

EPSG:3857 is only valid between 85°S and 85°N so poles are never rendered.

http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:crs:EPSG::3857&reportDetail=short&style=urn:uuid:report-style:default-with-code&style_name=OGP%20Default%20With%20Code&title=EPSG:3857

-Jukka Rahkonen-

Peter Wendorff wrote:
> Am 01.07.2013 23:23, schrieb Eric Fischer:
>> At the equator, the length of a tile is the circumference of the earth
>> (40,075 km) divided by 2^zoom, so a zoom level 19 tile is 76.4 meters on
>> a
>> side, for 5837m^2.
> ...but at the north pole (where we usually don't render), the north edge
> of a tile represents 0 (the circumference of a point) divided by 2^zoom
> = 0, so there's no general answer to your question.
>
> regards
> Peter
>>
>> Eric
>>
>> On Mon, Jul 1, 2013 at 2:16 PM, Vince Berubey <screams_3 at hotmail.com>
>> wrote:
>>
>>> Hi,
>>> using Mapnik and the python scripts, I generated tiles from zoom level
>>> 0
>>> to 20. I was curious to find what is the exact size covered by a tile
>>> for
>>> every zoom level.
>>>
>>> .i.e: Zoom19= 20m^2
>>>
>>> Best regards.
>>>
>>> _______________________________________________
>>> dev mailing list
>>> dev at openstreetmap.org
>>> http://lists.openstreetmap.org/listinfo/dev
>>>
>>>
>>
>>
>>
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>
>
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