[Tilecache] WMS's with dimensions

[Pascoe, S (Stephen)]

Thanks Christopher,

This turned out to be just the start I needed.  I attach a patch that
seems to work for me.  I've tried to keep to the style of the source: no
doc strings but a doctest file in the tests directory explains what I've
done. 

Note I have implemented it for the Disk, Memcache and AWSS3 backends but
only tested it on Disk.

We are likely to be using this feature in an app being deployed in the
next few months so I'd really like to hear how it's received.

Cheers,
Stephen.

---
Stephen Pascoe  +44 (0)1235 445980
British Atmospheric Data Centre
Rutherford Appleton Laboratory

-----Original Message-----
From: Christopher Schmidt [mailto:crschmidt at metacarta.com] 
Sent: 21 April 2008 18:45
To: Pascoe, S (Stephen)
Cc: tilecache at openlayers.org
Subject: Re: [Tilecache] WMS's with dimensions

On Mon, Apr 21, 2008 at 05:01:58PM +0100, Pascoe, S (Stephen) wrote:
> We are making heavy use of WMS with multiple extra dimensions and 
> would like to investigate using TileCache as a proxy.  Our WMS 
> services have at least a TIME dimension, often an ELEVATION dimension 
> and in one case a total of 5 dimensions with non-standard WMS
parameter names.
>  
> From my brief experiments it looks like Tilecache completely ignores 
> any dimension parameters sent to it before forwarding on the request 
> to the proxied WMS, as I would have expected (please correct me if I'm
wrong).
> However, it would seem relatively straight forward to extend Tilecache

> to handle dimensions defined in tilecache.cfg and cache each 
> combination of dimensions separately.
>  
> Has anyone looked into this problem?  I may be able to commit some 
> time within my current work to contributing a solution if there is 
> interest in adding this feature to Tilecache.

See:

http://openlayers.org/pipermail/tilecache/2008-April/000956.html

Regards,
--
Christopher Schmidt
MetaCarta
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