[mapserver-users] Creating lower aeriel image cache from the best resolution tiles

[Puneet Kishor]

Yesterday at SOTMUS here in SF, Dane Springmeyer (Maobox) demonstrated something they call "overzooming" that might be worth investigating. It seems to solve the kind of problem Thomas is articulating.



--
Puneet Kishor
Policy Coordinator for Science and Data
Creative Commons

On Jun 9, 2013, at 9:14 AM, thomas bonfort <thomas.bonfort at gmail.com> wrote:

> Jukka,
> No this is not considered, and you'll have to be really persuasive to make this happen as I do not see any advantage of adding this :) The reason is that in order to create e.g. the tile for level 0 for the first time, you'll have to downsample (and maybe previously seed) the full z=21 level (and all the intermediate ones).
> 
> regards,
> thomas
> 
> 
> On 9 June 2013 18:02, Rahkonen Jukka <jukka.rahkonen at mmmtike.fi> wrote:
>> Hi,
>> 
>> Have you been considering to seed the cache for aerial or satellite image layers in opposite order compered to the normal Z0, Z1, Z2... so that only the best resolution Z(max) tiles (or perhaps also Z(max-1) were requested from the WMS? The lower resolution tiles could me created by combining and resamplint tiles from the tiles of the higher zoom level in groups of 4. This should be much faster than asking lower level images from the WMS, especially if the WMS is a remote one and connection is slow. If resampling from Z+1 tiles yields to artifacts I feel that quality by resampling from Z+2 would normally be good and speed migh be still fantastic.
>> 
>> -Jukka Rahkonen-
>> 
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