[Tilecache] Customize TileCache get image routine

[Linda Rawson]

Basically I need to do the following:

1.  Check if the image already exists in the cache.
2.  If not then check for the image with the provider by utilizing a url
that returns a value.
3.  Check the value and If still no image then try another WMS service
provider.
4.  If still no image then return a noimage tile.

Can you direct me to the best python resource for these things?

Thanks so much!
Linda Rawson



On 10/15/07, Christopher Schmidt <crschmidt at metacarta.com> wrote:
>
> On Sun, Oct 14, 2007 at 09:31:02PM -0700, Linda_Rawson wrote:
> >
> > Digital Globe has this inherent problem that when they don't have an
> image it
> > will return the same image at a lower resolution.  It really should
> return a
> > noimage tile.  What I would like to do is customize the python scripts
> so
> > that if we did not have a tile cached it would first query the service
> to
> > find out if there is an image and if there is no image then it would
> return
> > a notile image.  Which python script would I change to do this?
>
> You're going to want to create a Layer subclass specifically for Digital
> Globe, in the Layer.py file.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
>
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