Hi Bryan,

glad you figured it out.
For the record, GWC's 900913 gridset used to come with 31 zoom levels.
That means up to 0.0001m pixel resolution, which also means a full
coverage of 1000 billions x 1000 billions tiles at the higher zoom
level. Which, if my math is correct, means a fully seeded layer with a
rather small average tile size of 4KB would take more than 3.7 billion
terabytes. Besides I don't think there's a single GIS dataset with a
spatial resolution of 1x10-4m.
The WMTS spec defines it up to zoom level 18. That proved to be too
low for some users, so on trunk we restored back the gridset
definition to its original shape. But I still think it wouldn't make
sense for zoom level > 24 (i.e. almost 1mm spatial resolution), which
is still 33.5M x 33.5M tiles at full world coverage. Which still would
be 4 billion terabytes for the highest zoom level with 4KB tiles.
Hopefully you define your layers with a restricted number of zoom
levels. But it'd make sense to have something saner as a default
value, hence the idea on limiting the number for pre-defined zoom
levels, although you can extend them if you want.

Cheers,
Gabriel

On Wed, Apr 18, 2012 at 5:41 PM, Hall, Bryan D Civ USAF AFSPC 38
OSS/OSM <[email protected]> wrote:
> That figures… after I give up and write that email, I find the answer:
>
>
>
> http://osgeo-org.1560.n6.nabble.com/GeoServer-tiles-generation-issue-above-zoom-level-18-in-Google-Maps-td4356763.html
>
>
>
> I just had to extend it to level 22, and it works fine now. After the server
> upgrade, I’ll write something up on this.
>
>
>
> Regards,
>
>
>
> Bryan Hall
>
>
>
>
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-- 
Gabriel Roldan
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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