[Tilecache] threshold

[Tim Langlois]

Could this be what is causing some of the Pink tiles in openlayers when
the tile is very close to a boundry (bounding box) of the map.  I've
noticed this when zooming in/out on a map.  The pink tiles always appear
when the zoom level causes a bordering tile to render very close to the
edge of the map data.  The tile is pink instead of the default
background (blue in my case).

On Mon, 2007-03-12 at 10:16 -0800, Brent Pedersen wrote:
> hi, first thanks to the developers for tilecache--and the help on irc.
> i was having some problems with tiles not showing up. at first i
> thought it was because of the metaTiling going out of the designated
> extents. that was not the case.
> 
> i was able to fix this by digging into Layer.py and setting
> exact=False in Layer.getCell().
> however, i think the real problem is with threshold.
> it is set to .001 which seems fine for lat/lon, but for a scale in
> meters, .001 is a millimeter (i think)...
> 
> anyhoo, a quick fix is to set threshold in __init__ as something like:
> 
> self.threshold = math.abs(bbox[2]/10e4)
> or
> (bbox[2] - bbox[0])/10e4
> 
> havent done enough testing to be sure this is the case, but it seems
> to have fixed the problems i was seeing.... and it makes sense.
> 
> is there a trac for tilecache?
> -brent
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