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

[thomas bonfort]

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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