[gdal-dev] Re: GDAL & WMS

[Adam Nowacki]

http://trac.osgeo.org/gdal/ticket/2450
should help

Jukka Rahkonen wrote:
> Courtney Schitka <c.schitka <at> gmail.com> writes:
> 
>> Has anyone noticed a huge performance issue with GDAL and WMS lately ? I've
> noticed a HUGE problems using the NASA JPL servers lately as in I can't seem to
> get data from them or anything. GDAL hasn't been rebuilt recompiled and the
> client code I am using hasn't changed at all either. CheersCourtney
> 
> Hi,
> 
> I guess that the reason is told on the front page at http://onearth.jpl.nasa.gov/ 
> 
> ATTENTION:
> 
> Due to server overloading, client applications are strongly advised to use the
> existing tile datasets wherever possible, as described in the Tiled WMS or
> Google Earth KML support
> 
> Frequent and repetitive requests for non-cached, small WMS tiles require an
> excessive amount of server resources and will be blocked in order to preserve
> server functionality. The OnEarth server is an experimental technology
> demonstrator and does not have enough resources to support these requests.
> An alternative solution already exists in the form of tiled WMS
> While sets of tiles with different sizes and alignment can be added when needed,
> for large datasets the duplication of storage, processing and data management
> resources is prohibitive. 
> 
> -Jukka Rahkonen-