[mapserver-users] labeling

[Joe Bussell]

We use a road classification value which is present in our *.dbf files.
The trick is to define different classes depending on the data.

LAYER
    NAME    cityCenter
    GROUP   defaultLayer
    TYPE    POINT
    TILEINDEX td_sm.shp
    STATUS  ON
    LABELITEM "NAME"
    CLASSITEM "DISPCLASS"
    MAXSCALE 9000

    CLASS
        EXPRESSION ( ( [DISPCLASS] = 3 ) )
        #NAME    "Big City"
        ...
    END

    CLASS
        EXPRESSION ( ( [DISPCLASS] = 6 ) )
        #NAME    "Medium City"
        ...
    END
END

For roads it is very similar, except I have a functional road class to
work with.

Joe Bussell
On Time Systems


        
On Wed, Jul 10, 2002 at 12:41:26PM -0700, Seamus Thomas Carroll wrote:
> Hi,
> 
> I am labeling various cities and roads I have the problem of roads and  
> smaller cities being labelled and the larger cities not being labeled.  
> All cities are part of the same layer and all roads are part of the same layer.
> The map file is outlined as follows:
> 
> LAYER # road drawing layer
> 
>   CLASS 
>     # highway drawing layer
>   END
> 
>   CLASS
>     # road drawing layer
>   END
> END # end of road drawing layer
> 
> LAYER # road label layer
> 
>   CLASS
>     # highways label info
>   END
> 
>   CLASS
>     # road label info
>   END
> END # end of road label layer
> 
> 
> LAYER # city layer
> 
>   CLASS 
>     #Largest city info
>     #Labeling and drawing of points
>   END
> 
>   CLASS
>     #Medium city info
>   END
> 
>   CLASS
>     #Small city info
>     #Labeling and drawing of points
>   END
> END # end of city layer
> 
> I want the labeling to go in this order of precedence:
> 1) larger city
> 2) small city
> 3) highway
> 4) road
> Any suggestions?
> 
> At some zoom levels things look correct and at others they dont.  I have 
> tried changing the order of the layers and the order of the classes 
> within the layers.  The FORCE command wont be useful because there are 
> major cities side by side and I dont want overlap.
> Thanks for reading this far and any suggestions would be much appreciated.
> 
> Seamus
> 
>