[OSM-talk] Algorithm re Count of OSM Tiles

[Peter Barth]

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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