[Tilesathome] WG: Questions on tile updating process

[80n]

On Thu, May 7, 2009 at 9:02 AM, Sebastian Spaeth <sebastian at sspaeth.de>wrote:

> Jan Jesse wrote:
> >
> > Hi
> >
> >> In zoom 6 to 11 the tiles of Germany are in a very bad state.
> >> Some tiles are completely empty and say to be of "Unknown Type" in
> >> openlayers.
> >
> > Just now I tried it again and the problem seems not to be solved?
> >
> > Is anyone working on it?
>
> There is no procedure to automatically create those caption layers.
> Someone needs to feel responsible to either create and upload them,
> currently.
>
> This is how a stock t at h client is able to render the caption layer for a
> low zoom tileset:
>
> ./tilesGen.pl xy 34 21 6 caption
>
> which then needs uploading with
>
> ./tilesGen.pl upload
>
> Next time that low zoom is stitched it will take the new captions into
> account.
>
>
> This is still not optimal. As the supression of labels is based on
> proximity of labels we always will get a different selection of captions
> for each tileset. The problem gets worse with fewer margin around the
> tileset and would be eliminated if we could use the whole world as data
> set for our rendering.
> I would love to download the caption data from XAPI locally and point
> the t at h client to use that local osm file as datasource for all the
> caption tiles, but the client is not capable of doing that.
>
> Downloading the whole world for each tileset is out of question, of course.
>

Is it?  What captions are you currently downloading?  Cities, towns,
villages?

You can grab up to 10 x 10 degrees from XAPI which might be enough to reduce
all but the most pathological edge case.

If that isn't enough I could remove that bounding limit for just these tags
until we find out what is really needed.


80n
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