[OSM-talk] Algorithm re Count of OSM Tiles

[Dave Sutter]

I think that needs testing.

Also, it should be pointed out that it is using an approximation for calculating the tileX and tileY.

Sent from my iPhone

On Sep 22, 2013, at 10:18 AM, Peter Barth <osm-talk at won2.de> wrote:

> Hi,
> 
> Arnie Shore schrieb:
>> All, given a coordinates range and zoom range, is there an available 
>> algorithm that will calculate the count of OSM tiles involved?
> 
> Without rounding and assuming negative values vor lat/lon in case of
> south/west coordinates and start and end being zoomlevels that are
> included in the count I think (didn't test it ;)) this should be
> correct:
> 
> tilesX = 2^(start-1)*($w-$e)/360 
> tilesY = 2^(start-1)*($n-$s)/180 
> tilesX*tilesY * 4^(end-start)
> 
> Regards,
> Peda
> 
> p.s. you should start a new topic for new questions. However, you
> replied to another topic and just changed the subject.
> 
> -- 
> 
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