[OSM-dev] Too many decimal places in permalinks
john at mckerrell.net
Tue Oct 23 11:10:03 BST 2007
On 23 Oct 2007, at 10:25, Tom Hughes wrote:
> In message <4714CFF7.1080000 at arjam.net>
> Robert Munro <rjmunro at arjam.net> wrote:
>> I noticed the other day that the permalinks on the view tab of
>> www.openstreetmap.org have way more decimal places than is useful.
>> Below is a little (untested) patch to site.js that should make the
>> much shorter. It rounds the numbers to the (current zoom level)/3
>> decimal places, which at zoom level 2 (the worst case) is accurate to
>> less than 3 pixels - zoom level 2 is:
>> (1024 pixels wide)/(360 degrees)= 2.8 pixels/degree.
> Applied and deployed.
Hi, I'd suggest not linking this to zoom level as you may find that
when you click on a link you've copied (perhaps after zooming out a
few times), and then zoom in, you end up somewhere you don't expect
to be due to the rounding. I'd suggest just rounding to 5 decimal
places should be fine for our purposes at all zoom factors (sorry,
patch not provided but should be fairly simple).
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