[Tilesathome] Low Zoom

[spaetz]

On Tue, Jul 15, 2008 at 05:53:08PM +0100, 80n wrote:
> The low-zoom for most of Europe is looking a bit sick (well pale and
> spotty), particularly at zoom 6.  Example here:
> http://informationfreeway.org/?lat=46.521368281833375&lon=16.895189840491245&zoom=6&layers=B000F000F

The spotty part is a bug which mostly occurred with the early lowzoom generation.. The low zoom stitcher was not always retrieving valid data and the tile stitcher then inserted an "unknown" tile. I mostly solved this with a quick fix by retrying on error, which gets rid of the blue spots. I will need to investigate the root cause, but this should not be a problem anymore.

As for pale, how do you mean that? Are streets not pronouned enough?
I recursively stitch together tilesets based on the captionless layer from z6, up to z12, zoom level by zoom level. Might it be that too much data is lost after 6 "stitches"? Hoes does the current lowzoom does it? I will have to look into the darken qualifier thing. It's on my TODO list now.

> Perhaps the pale rendering is an intentional change (the old lowzoom
> compositing used the "darken" qualifier at each level to increase contrast),
> but the blue spots are definitely not a sign of good health.

summary:
ad 1) on todo list
ad 2) mostly fixed. needs more investigation.