[Tilecache] Can't directly access the cache from Potlatch

[Ian Dees]

On Wed, Sep 1, 2010 at 11:32 AM, Eric Wolf <ebwolf at gmail.com> wrote:

> I think I'm missing something obvious:
>
> I've setup tilecache.cgi to construct a cache of the NAIP imagery on my
> local server. So far, this works great as an "Custom" imagery source in
> Potlatch:
>
> http://navigator.er.usgs.gov/naip/tilecache.cgi/1.0.0/0/!/!/!
>
> But I would also like to be able to hit the disk cache directly, ala:
>
> http://navigator.er.usgs.gov/naip/0/!/!/!
>
> I can successfully load individual images from the cache like this:
>
> http://navigator.er.usgs.gov/naip/0/16/15060/25346.png
>
> When I look at the Apache error log, I see "Cache hit:... Tile: x: 15060,
> y: 40188, z: 16
>
> But in the naip/0/16/15060 directory, there are only four PNGs with
> filenames nothing like "40188.png":
>
> 25345.png, 25346.png, 25347.png, 25348.png,
>
> My tilecache.cfg looks like this:
>
> [cache]
>
> type=GoogleDisk
> base=/osmcp/rails/public/naip
>
> [0]
> type=WMS
> url=http://isse.cr.usgs.gov/ArcGIS/services/Combined/SDDS_Imagery/MapServer/WMSServer
> #layers=0
> levels=19
> bbox=-180,90,180,-90
> srs=EPSG:102113
> spherical_mercator=true
> tms_type=google
>
> I guess this could be a moot point if there isn't a significant speed improvement hitting the cache directory directly vs. using tilecache.cgi as a proxy.
>
>
Two things:

1. Tilecache does directory munging to guarantee that any one directory has
a limited number of files in it. You probably actually want to look in the
/osmcp/rails/public/naip/16/000/015/060/000/040/ directory for 188.png.
2. tms_type=google flips one of the axes on its head so the tiles that get
saved in cache will have a different number than the ones on the disk.

After typing all this I noticed you used the GoogleDesk cache type, so I
might be completely wrong.
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