[mapserver-users] Re: Clustering and tile clipping

[Tamas Szekeres]

Hi Wim,

Did you try the BUFFER setting to increase the search area during the
cluster creation?
For more information see: http://mapserver.org/mapfile/cluster.html

Best regards,

Tamas




2012/1/16 Wim Vanbelle <wimvanbelle at gmail.com>

> Does anyone have any working examples of how they implemented clustering
> without the tile clipping?
>
> Thanks.
>
> On 11 January 2012 10:00, Wim Vanbelle <wimvanbelle at gmail.com> wrote:
>
>> Hi,
>>
>> I'm very happy that mapserver is now capable of server side clustering.
>> However I wonder if it's possible to completely get rid of the tile
>> clipping.
>>
>> Currently I've clustered a point layer with 44k points:
>>
>>             CLUSTER
>>                         MAXDISTANCE 100
>>                         REGION "ellipse"
>>
>>                 END
>>
>> It is displayed with a simple image:
>>                        STYLE
>>                                 SYMBOL          "small_shaded.png"
>>                                 SIZE            21
>>                                 OUTLINECOLOR    0 0 0
>>                         END
>>
>> However, when viewing this on google maps, the images are often clipped
>> at the tile edges.
>>
>> I figured that I could solve this with mapcache:
>>
>>  <tileset name="ld">
>>     <source>ld</source>
>>     <cache>disk</cache>
>>     <grid>g2</grid>
>>     <format>PNG</format>
>>     <metatile>2 2</metatile>
>>     <metabuffer>30</metabuffer>
>>     <expires>3600</expires>
>>     <auto_expire>2592000</auto_expire>
>>   </tileset>
>>
>> i've tried higher values for metatile and it helps a bit, but the problem
>> simply shifts location. Also with higher values (eg 5 5 metatile) mapserver
>> doesn't return the tiles on time for mapcache and I get gaps in my results.
>>
>> Would preseeding the data help with the timeouts? Any other solutions
>> that I may try? The metadata parameter for tile_edge buffer only works with
>> labels as far as i know.
>>
>> Thanks in advance, this issue has been troubling me for some time now :).
>>
>> Best regards,
>> Wim
>>
>>
>
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