[OpenLayers-Users] Problems with TileCache at zoom level 16

[Chris Holmes]

So I'm using TileCache to pre-cache everything, and I've come to figure 
out that it seems to have screwy behavior at zoom level 16.  I kept 
thinking it was just me, but it turns out that at zoom 16 I get 5 by 5 
areas of tiles, that have a border of 'sorry, no data available' (which 
is my image for a broken link).  If you scroll around this pattern is 
repeated, instead of just being some random no data available because of 
load on the server or some such.

You can see this in action at: 
http://sigma.openplans.org/dev/test.html?lat=40.76349&lon=-73.97426&zoom=16&layers=BT

All of manhattan at zoom level 16 is pre-cached, but there's a grid of 
tiles not returning around chunks of tiles 5x5.


I'm also curious about settings to decrease how often I get tiles that 
don't show up.  It doesn't appear to be a timeout (since it doesn't seem 
to behave according to a set time), but when I use squid it would just 
continue to wait on tiles until GeoServer loaded them.  With tilecache 
if I'm at a zoom area that hasn't been pre-cached and move around 
quickly then I'll often get stretches of not found tiles, instead of 
just waiting to load from Geoserver.

I also sometimes even get tiles not found on areas that are pre-cached, 
but it does take me moving and zooming quite a lot.

keep up the great work,

Chris



-- 
Chris Holmes
The Open Planning Project
http://topp.openplans.org
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