[Tilecache] Tilecache seeding with BBOX args

[Roger André]

Ok, so maybe there isn't a problem, but I'm still totally confused.  I reran
the seeding command with the same extents, but widened the Zoom range to be
from 1 - 11.  I got tiles generated, but only between Zoom levels 6 - 10.
I'm not really sure I understand why.
--

On Mon, Sep 29, 2008 at 2:08 PM, Roger André <randre at gmail.com> wrote:

> 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
>
>
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/tilecache/attachments/20080929/7883c928/attachment.html