[Openstreetmap] applet speedup

[Simon Hewison]

SteveC wrote:
> The applet now grabs the gps data seperately - and in preference - to
> landsat. My tests show it to be significantly quicker...

When it does grab the Landsat tiles, does it do it through the squid 
proxy cache? Ditto for the WMS server before compositing the static 
maps. That way, the Landsat will be in something that is a bit quicker 
to serve than waiting for the JPL Landsat server to scale / crop / 
encode/transmit the images, since the odds are that the result will be 
in the cache already, but it depends on how the Landsat server sets the 
HTTP expiry headers.

Even if Landsat server gives stupidly short HTTP expiry headers, it 
would be possible to fake that and set an expiry time of something like 
a month, and get squid to cache it, since Landsat doesn't change that often.

-- 
Simon Hewison