[Tilecache] Tilecache seeding with BBOX args

[Roger André]

Hi,

I would like to test the speed that it takes to seed my cache for a single
tile of my raw data.  I am having trouble figuring out the correct
config/commandline syntax to run tilecache_seed.py so that it only runs on
the area occupied by my raw tile.  I *think* that since I have my Tilecache
layer set to use "spherical mercator", I need to specify both the layer's
bbox, and the commandline argument to tilecache_seed.py in spherical
mercator coordinates, and not in the WGS84 coords that my original data is
in.  I also *think* that the bbox format is "min_x, min_y, max_x, max_y",
based on the exaple present in the original tilecache.cfg file.  Based on
those assumptions, I have the following info:

- wgs84 bbox = "-110, 30, -105, 35"

- Based on that, I *think* the bbox in spherical mercator is:
sph_mercator bbox =
"-12245143.987260,3503549.843504,-11688546.533294,4163881.144064"

- (That's based on using cs2cs to convert the wgs84 coords):
$echo "-110 30" | cs2cs + +init=epsg:4326 +to +init=epsg:900913 -f "%.6f"
-12245143.987260        3503549.843504 0.000000
$echo "-105 35" | cs2cs + +init=epsg:4326 +to +init=epsg:900913 -f "%.6f"
-11688546.533294        4163881.144064 0.000000

- tilecache config:
[blah]
type=WMS
url=http://10.10.10.143/cgi-bin/mapserv?map=/var/www/mapfiles/blah/blah.map
layers=imagery2
spherical_mercator=true
metabuffer=15
bbox="-12245143.987260,3503549.843504,-11688546.533294,4163881.144064"

- This entry works fine when I try to view the tile in Google Maps.
Displays correctly with no issues.  It also works fine when I use
tilecache_seed.py without specifying a bbox:
./tilecache_seed.py "http://localhost/cgi-bin/tilecache-2.04/tilecache.cgi?"
blah 1 2
###### (0, 0, 1), (2, 2, 1)
Cache miss: -20037508.34,-20037508.34,-0.000799998641014,-0.000799998641014,
Tile: x: 0, y: 0, z: 1, time: 0.235054969788
01 (000000, 000000) = (-20037508.3400 -20037508.3400 -0.0008 -0.0008)
[0.2352s : 4.246/s] 1/4
Cache miss:
-0.000799998641014,-20037508.34,20037508.3384,-0.000799998641014, Tile: x:
1, y: 0, z: 1, time: 0.225296020508
01 (000001, 000000) = (-0.0008 -20037508.3400 20037508.3384 -0.0008)
[0.2254s : 4.338/s] 2/4
Cache miss:
-20037508.34,-0.000799998641014,-0.000799998641014,20037508.3384, Tile: x:
0, y: 1, z: 1, time: 0.242295980453
01 (000000, 000001) = (-20037508.3400 -0.0008 -0.0008 20037508.3384)
[0.2424s : 4.264/s] 3/4
Cache miss:
-0.000799998641014,-0.000799998641014,20037508.3384,20037508.3384, Tile: x:
1, y: 1, z: 1, time: 0.221132993698
01 (000001, 000001) = (-0.0008 -0.0008 20037508.3384 20037508.3384) [0.2213s
: 4.325/s] 4/4

- However, when I try to specify the same bbox as the layer's in the
commandline, I get no tiles:
./tilecache_seed.py "http://localhost/cgi-bin/tilecache-2.04/tilecache.cgi?"
blah 4 5 "-12245143.987260,3503549.843504,-11688546.533294,4163881.144064"

I'm betting that I'm specifying incorrect coordinates somehow, but I'm not
sure where.

- To recap, I'm starting with a raw tile that has these extents in
EPSG:4326:
Upper Left  (-110.0000000,  35.0000000)
Lower Left  (-110.0000000,  30.0000000)
Upper Right (-105.0000000,  35.0000000)
Lower Right (-105.0000000,  30.0000000)

- I want to run Tilecache against this and generate Google Map tiles, but
only for the area occupied by that tile.

Thanks,

Roger
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