[mapserver-users] Clustering and tile clipping

[Wim Vanbelle]

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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