[Tilecache] MetaTiling - does projection affect?

Bill Teluk Bill.Teluk at team.telstra.com
Thu May 6 00:18:09 EDT 2010


Hi, I've got TileCache 2.10 installed (part of a FGS 9.5 install), with
metaTiling turned on for one of my layers.  The cache is certainly working
but I don't think that metaTiling is working as I expect - I'm testing if
metaTiling is working by checking the number of tiles against the number of
../tilecache/.. requests in the Apache access log - if metaTile is not
specified I have 316 requests with 184 tileimages found in the cache, with
metaTile=true, I have 184 requests and 184 tile images - shouldn't it be the
other way around - less requests for the same number of tiles?  (The
boundingbox size in the WMS calls are the same size also.)
I'm restarting Apache in between config changes.
I don't have Spherical Mercator as my projection (using GDA94 as the
projection/datum etc) - would that make a difference?
My config looks like:

[BaseDetailed]
type=WMS
url=http://pudl-gis-01.networks.in.telstra.com.au:8080/cgi-bin/mapserv?map=/home/maptools/fgs/mapconfig/sbbt/saturndev.map
mapfile=/home/maptools/fgs/mapconfig/sbbt/saturndev.map
extension=png
layers=BorderAndCoast,SettledLand,RecreationalLand,IndustrialLand,Parks,BaseRoads,MetropolitanSuburb,RegionalLocality,PostCodeArea,TownNames,MajorTowns,CapitalCities
bbox=100,-50,155,-5
srs=EPSG:4283
levels=17
resolutions=0.28,0.112,0.056,0.028,0.0112,0.0056,0.0028,0.00112,0.00056,0.00028,0.000112,0.000056,0.000028,0.000014,0.0000112,0.0000056,0.0000028
metaTile=yes
metaBuffer=40

Thanks in advance!
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