[OSM-dev] cache curious

SteveC steve at asklater.com
Fri May 12 09:43:33 BST 2006


* @ 02/05/06 09:20:45 AM rolymo at gmail.com wrote:
> Hi All.
> 
> I am curious to know how the map viewer cache is refreshed.
> 
> I'd like to use this link to follow my own progress through a particular
> area of south-western England:
> http://www.openstreetmap.org/index.html?lat=50.4&lon=-4.94&zoom=11
> 
> The wiki FAQ* states that the cache is refreshed every 48 hours but it is
> possible to manually refresh an individual tile at any time.  A manual
> refresh has sometimes worked as suggested by the wiki, but often returns the
> unmapped tile.  When a manual refresh has worked, its been a matter of time
> before those tiles have reverted to unmapped images (as at time of writing).
> 
> I know that the London mapping, for example, shows up at a similar zoom
> level:
> http://www.openstreetmap.org/index.html?lat=51.52&lon=-0.1&zoom=11
> 
> Is the difference to do with turning line segments to ways?  (Most of my
> line segments were added at least a week ago - but few are yet added to
> ways.)  Or cache is now set to refresh at a different rate to that suggested
> by the wiki?  (Obviously most of the London data has existed for far longer

No.. it's on a image-by-image basis and it 48 hours since that image was
last generated. The old servers used to die trying to plot things and
woul return blank tiles now and again. You should be seeing better
results now.

> than my Cornish entries.)  Or something else altogether?
> 
> Whatever the reason, its not a big deal to me - just a curiosity.  Many
> thanks for any insight.
> 
> Cheers,
> 
> Dave
> 
> *  Wiki FAQ entry:
> http://wiki.openstreetmap.org/index.php/FAQ#I.27ve_been_editing_things_all_day_but_my_changes_don.27t_show_up_in_the_viewer.21

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have fun,

SteveC steve at asklater.com http://www.asklater.com/steve/




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