[mapserver-users] multi criteria visualization on vector

[Alexander Petkov]

The classes are fine for defining your 25 combinations to make them
look the way you want to.

To the question about your shapefile--you could keep as one shapefile
and define you connection to the data as shown here:
http://mapserver.org/input/vector/ogr.html

Define a static filter at first to test.
Then, when that works, you can use variable substitution:
http://mapserver.org/mapfile/variable_sub.html



At least that's what I'd try.

Alex

On Fri, Nov 12, 2010 at 11:08 AM, Simone Frigerio
<simone.frigerio at univie.ac.at> wrote:
>
> Hi folk,
> one question on visualization based on logic criteria.
> I have a huge vectorial shp file (thousand of records). An example of attributes as following:
> ShapeABCDCOMBI
> Polygon00340_0_3_4
> Polygon00300_0_3_0
> ........................
> There are 25 combination of the 4 fields A-B-C-D visualized by unique code in COMBI field.
> I managed a mapfile like:
> ...
>  LAYER
>     NAME "MH"
>     TYPE POLYGON
>     DATA "melanie/topo"
>     TRANSPARENCY 35
>     GROUP "MASCHERA"
>     STATUS ON
>     TEMPLATE "ttt"
>     CLASSITEM "COMBI"
>     CLASS
>       EXPRESSION "0_0_3_0"
>       STYLE
>         COLOR 25 255 255
>         OUTLINECOLOR 0 0 0
>       END
>     END
>   END
> ....
> I visualize in this way only the polygons with the value in COMBI field. I can obviously add same class expressions for every value I want. My doubt is:
> if I need to visualize all the "n" combination available  like differently "n" layers in a same view how can I do? I have to separate the original file in 25 shp layers (quite boring) or can I provide using only the original complete shp file?
> Example on the layer tree:
>
> Thanks.
>
> Simone
>
> --
>
>
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