[mapserver-users] Re: Clustering and tile clipping

[Wim Vanbelle]

Hi,

Thanks for  your answer, i'll give that a try immediately :).

I remember I played around with it in the beginning, but currently it is
indeed set to 0.

What is an acceptable value for this? Am I to set this to the same value as
the maxdistance in the cluster? (Being 100 in my case)

Or perhaps this should be set to the size of my image representing the
cluster, being 10 pixels?

Best regards,
Wim




On 16 January 2012 10:55, Tamas Szekeres <szekerest at gmail.com> wrote:

> 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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>
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