[Tilecache] Changing scales

[Oles Kit]

Thank you, Jonathan,

The problem was not in levels mismatch, but in the cache itself. After 
ensuring for the tenth time that all my extents and bounding box 
calculations are correct and meet those defined in the mapfile I just 
changed the name of tilecache layer ([uk_27700] --> [uk_map]) both in my 
OpenLayers javascript and in tilecache.cfg and that's it! Moreover, all 
layer names but [uk_27700] produced correct map, but only naming a layer 
[uk_27700] was messing up the extents, resolutions or both.

Obviously this could not be a problem of a secret tilecache layer naming 
convention. After I cleared the cache manually at the location defined 
within tilecache.cfg, [uk_27700] layer was visualised properly and 
correctly! I think that there might be a bug in the tilecache which 
makes the tilecache serve tiles which are saved in the cache even when 
the layer parameters are changed and the tiles should be actually 
overwritten.

Any comments from the developers?

Oles Kit

Jonathan wrote:

 > Oles,
 >
 > I experienced what you call the puzzle-effect when I had a mismatch
 > between the number of zoom levels and resolutions specified in the
 > tilecache.cfg.  Your [UK_27700] example has 16 resolutions, but no
 > "levels" set.  Since "levels" defaults to 20, there might be a
 > mismatch.
 > Try adding levels=16 (or whatever number of resolutions you set) to
 > see
 > if the problem goes away.
 >
 > Jonathan