[OSM-talk] timed access restrictions and Mapnik

[Martijn van Exel]

On Mon, Aug 30, 2010 at 1:59 PM, John Smith <deltafoxtrot256 at gmail.com> wrote:
> On 30 August 2010 21:52, Martijn van Exel <m at rtijn.org> wrote:
>> We recently had a bridge temporarily removed for the SAIL 2010 event
>> in Amsterdam[1].
>> I tagged it access=no with date_on and date_off time restriction tags
>> as suggested on http://wiki.openstreetmap.org/wiki/Key:access, hoping
>> it would be picked up by Mapnik as well.
>> It turns out it is not and the road is still rendered as a no access
>> road even though the date_off is over a week ago. This discourages
>> tagging temporary access restrictions - could we make it so that it
>> does take date_on and date_off into account?
>
> Due to the nature of caching tiles it doesn't seem feasible to think
> temporary tagging would be handled in the way you think it should,
> however I do expect routing software might be a better place for these
> types of things to be dealt with.
>

While you can't take browser caching into account, in my experience
the main tile server manages to keep tiles updated fairly well these
days - good enough for one-off (non-repeating) access restrictions
with a day resolution to be rendered accurately.

Martijn

martijn van exel +++ m at rtijn.org
laziness - impatience - hubris
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