[OSM-talk] Specialist mapping

[Dave Sutter]

I have heard a few talks recently on tiled vector data. I am sure you could
find some frameworks that work with that. I don't have any references off
hand.

This allows you to send vector data to a client while also allowing
different, more detailed representations as you zoom in. You don't need to
have different data for every zoom, since this is vector data and can be
redrawn at any scale. For example you might have data tiles for zoom levels
1,5,9 and 13.

There are different ways of handling large polygons for vector tiles. In
this particular case, I would recommend breaking the timezone polygons into
small pieces when you are at finer zoom levels. That will save a lot of
useless computation on the client side when you are doing a hit check or
rendering.

Dave


On Fri, Sep 6, 2013 at 1:36 PM, Lester Caine <lester at lsces.co.uk> wrote:

> Another list where I am making myself unpopular is the tz database one.
> Reasons for that inly matter if you display time before 1970, but that is
> another matter.
>
> In the OSM data we have what looks like a complete coverage of the current
> timezone map, and many of the large areas are tagged at the country or
> state level, but some zones are passing through the middle of the larger
> relation, so are tagged on smaller one.
>
> The question that has been asked is 'how do I find the objects covering a
> particular timezone?' I suspect that overpass can produce this, but given
> the size of the areas I'm not sure it's appropriate? It's just stuck
> 'processing query' at the moment ... and timeout :(
>
> What I think I need to do is create a slippy map which has the timezones
> as an overlay and can return a timezone for a coordinate entry. I can pull
> up the time information for the timezone via my other tools. So can anybody
> suggest what may be the best way to for something which needs to able to
> handle full world as easily as fine detail?
>
> --
> Lester Caine - G8HFL
> -----------------------------
> Contact - http://lsces.co.uk/wiki/?page=**contact<http://lsces.co.uk/wiki/?page=contact>
> L.S.Caine Electronic Services - http://lsces.co.uk
> EnquirySolve - http://enquirysolve.com/
> Model Engineers Digital Workshop - http://medw.co.uk
> Rainbow Digital Media - http://rainbowdigitalmedia.co.**uk<http://rainbowdigitalmedia.co.uk>
>
> ______________________________**_________________
> talk mailing list
> talk at openstreetmap.org
> http://lists.openstreetmap.**org/listinfo/talk<http://lists.openstreetmap.org/listinfo/talk>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk/attachments/20130906/ba881d00/attachment.html>