[ka-Map-users] precaching only at some scales?

Sacha Black sacha.black at gmail.com
Tue Oct 7 12:32:51 EDT 2008

hi Jaun,

I think you want to run precache as normal, but with an edited
config.php where you first delete the scales below 100,000. This will
create all the tiles for the upper scales.

then re-edit config.php to insert back all your desired lower scales,
and use tile.php as default. Tile.php should check if a tile exists
before creating it, so for the upper level scales, it will always use
the precache cache, and for the lower scales it will add new tiles to
the cache on the fly as needed.


On Mon, Oct 6, 2008 at 3:54 PM, juanbatman <elsueniero at gmail.com> wrote:
> Hello List,
> I have my map with scales defined in config.php ranging from 1:25,000,000 to
> 1:25,000
> The thing is that the map is so big that according to my calcs building the
> precache for the 1:50,000 and 1:25,000 scales will take a couple of days to
> finish!
> Those scales will be rarely used, so I figured out that maybe I could pre
> calculate the cache for all scales up to 1:100,000 and then let tile.php do
> the drawing for smallers scales, but I could´t figure out how.
> What I tried so far was:
> 1st attempt: In all layers use the cache mode
>        METADATA
>            "tile_source" "cache"
>        END
> Of course it didn´t worked because when going to smallers scales cache was
> empty and the browser kept repeating the request.
> 2nd attempt:
>        METADATA
>            "tile_source" "auto"
>            "redraw_interval" "100000"
>            "refresh_interval" "200000"
>        END
> and I precalculated the cache for all scales but 1:50,000 and 1:25,000
> It didn´t work either. The application was redrawing all the scales, even
> for those that precalculated cache was available.
> Is there any know solution for this??
> Thanks a lot
> Juan
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