Layer display order (z-index)?

[Jackey Cheung]

Here's the part of map file. They are in the order as they are in the map 
file, and they are next to each other in the map file. The icons you saw in 
the image are bus stops:


MAP
# ......
# Lots of layers here
# ......

Layer
  NAME              "Streets"
  GROUP             "Feature"
  STATUS            DEFAULT

  TYPE              LINE
  CONNECTIONTYPE    OGR
  CONNECTION        "streets.TAB"
  DATA              "streets"
  UNITS              METERS

  TRANSPARENCY      ALPHA
  CLASSITEM          "TypeCode"

  CLASS
    MINSCALE        2000000
    MAXSCALE        15000000
    EXPRESSION      "S1"
    STYLE
      WIDTH          1
      COLOR          255  200  64
      ANTIALIAS      TRUE
    END
  END

  CLASS
    MINSCALE        200000
    MAXSCALE        2500000
    EXPRESSION      "S1"
    STYLE
      WIDTH          3
      COLOR          128  100  64
      ANTIALIAS      TRUE
    END
    STYLE
      WIDTH          2
      COLOR          255  200  64
      ANTIALIAS      TRUE
    END
  END

  # ......
  # more similar classes of different types go here
  # ......
END

LAYER
  NAME              "POI"
  GROUP             "Feature"
  STATUS            DEFAULT
  #MINSCALE         2000
  MAXSCALE          25000

  TYPE              POINT
  CONNECTIONTYPE    OGR
  CONNECTION        "POI.TAB"
  DATA              "POI"
  UNITS              METERS

  TRANSPARENCY      ALPHA

  #FILTERITEM        "Type"
  FILTER            (("[Type]" ==  "parks")  OR ("[Type]" ==  "bus")  OR 
("[Type]" ==  "rail") OR  ("[Type]"  == "subway") OR  ("[Type]"  == 
"ferry"))
  CLASSITEM          "Type"

#    CLASS
#      EXPRESSION      "parks"
#    END

  CLASS
    EXPRESSION      "bus"
    SYMBOL          "bus stop"
  END

  CLASS
    EXPRESSION      "rail"
    SYMBOL          "kcr"
  END

  CLASS
    EXPRESSION      "subway"
    SYMBOL          "mtr"
  END

  CLASS
    EXPRESSION      "ferry"
    SYMBOL          "kcr"
  END
END

# ......
# Even more layers go here
# ......
END




----- Original Message -----
From: "Steve Lime" <Steve.Lime at dnr.state.mn.us>
To: "Jackey Cheung" <cheung.jackey at GMAIL.COM>; 
<MAPSERVER-USERS at LISTS.UMN.EDU>
Sent: Wednesday, May 30, 2007 05:57
Subject: Re: [UMN_MAPSERVER-USERS] Layer display order (z-index)?

Layers are rendered in the order they appear in the mapfile so I'm not sure 
how the POI symbols
could be rendered below the line work. You could try turning them into 
annotation instead of point
layers since annotation is always drawn last. You might need to post your 
mapfile...

Steve

>>> On 5/29/2007 at 4:06 AM, in message 
>>> <C69E8A2815154DF2B5E9416C95DA580F at jackey>,
Jackey Cheung <cheung.jackey at GMAIL.COM> wrote:
> Greetings!
>
> I've put some roads, polygons and poi to my map, their order in the map 
> file
> is: polygon layers go first, then road layers, and the poi layer is the 
> last.
> A picture is generated like this: 
> http://www3.mapasia.com/jackout/mapserv.png
>
> As you can see, those 2 POI icons are covered by roads, can I make those 
> POI
> icons always on top of everything else in the map?
>
> I've tried re-ordering layers in the map file, but the icons are kept 
> covered
> by roads.