[Tilecache] Configure (TMS) BoundingBox and Origin independently

[Just van den Broecke]

Hi,

I am using TileCache 2.10 TMS with ImageLayer layers. I would like to 
configure the actual data extent different from the tile grid origin, 
like described in the TMS standard:
http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification#TileMap_Resource
(<Origin> and <BoundingBox>

I may overlook options but I see no way in doing this. For example, this 
tilecache.cfg:

[GBKN]
type=Image
transparent=true
spherical_mercator=false
resolutions=860.160,430.080,215.040,107.520,53.760,26.880,13.440,6.720,3.360,1.680,0.840,0.420,0.210,0.105,0.0525
metatile=yes
bbox=-65200.96,242799.04,375200.96,683200.96
srs=EPSG:28992
file=/var/kademo/data/klic/10G058471_1/GB_all.png
filebounds=139679,449517,139802,449595
data_extent=139679,449517,139802,449595

I get from TileMap info:
<BoundingBox minx="-65200.960000" miny="242799.040000" 
maxx="375200.960000" maxy="683200.960000"/>
<Origin x="-65200.960000" y="242799.040000"/>

i.s.o BoundingBox set to filebounds/data_extent (yes these are very 
small areas). Also I see in TMS.py line 77: that Origin is set to 
"layer.bbox[0], layer.bbox[1]". Or are there other ways ? thanks and 
best regards,

--Just

Just van den Broecke
The Netherlands
www.justobjects.nl