SET THE SCALE OF WHERE CLASSES OF FEATURES DISPLAY

[Newland Agbenowosi]

Bob,
Below is an example layer definition showing how to draw the same layer at
different scales by defining the MINSCALE/MAXSCALE for each class.  In you
case, you migh need some thing like this:

LAYER
  CLASS
    EXPRESSION /^1/
    MINSCALE ??
    MAXSCALE ??
    COLOR 100 100 100
    SIZE 7
    SYMBOL "circle"
  END
  CLASS
    EXPRESSION /^2/
    MINSCALE ??
    MAXSCALE ??
    COLOR 10 10 10
    SIZE 7
    SYMBOL "circle"
  END
  CLASS
    EXPRESSION /^3/
    MINSCALE ??
    MAXSCALE ??
    COLOR 100 100 100
    SIZE 7
    SYMBOL "circle"
  END
  CLASS
    EXPRESSION /^4/
    MINSCALE ??
    MAXSCALE ??
    COLOR 10 10 10
    SIZE 7
    SYMBOL "circle"
  END
  CLASS
    EXPRESSION /^5/
    MINSCALE ??
    MAXSCALE ??
    COLOR 10 10 10
    SIZE 7
    SYMBOL "circle"
  END
  CLASS
    EXPRESSION /^6/
    MINSCALE ??
    MAXSCALE ??
    COLOR 100 100 100
    SIZE 7
    SYMBOL "circle"
  END
  CLASSITEM "<FIELD_NAME>"
END

-------------------------------------------By
example ---------------------------------------
LAYER
    NAME "roads"
    GROUP "roads"
    TYPE LINE
    TOLERANCEUNITS pixels
    DUMP true
    TOLERANCE 5
    CLASS
      MAXSCALE 20000
      COLOR 100 100 100
      SIZE 7
      SYMBOL "circle"
      OVERLAYCOLOR 255 255 2255
      OVERLAYSIZE 2
      OVERLAYSYMBOL "dash1"
    END
    CLASS
      MINSCALE 20001
      MAXSCALE 40000
      COLOR 100 100 100
      SIZE 5
      SYMBOL "circle"
      OVERLAYCOLOR 200 200 200
      OVERLAYSIZE 3
      OVERLAYSYMBOL "circle"
    END
    CLASS
      MINSCALE 40001
      COLOR 100 100 100
      SIZE 1
      SYMBOL "circle"
    END
    STATUS on
    PROJECTION
      "init=epsg:4326"
    END
    DATA "/ms4w/chameleon/data/cities/tema/roads.shp"
    METADATA
      WMS_TITLE "roads"
      WFS_TITLE "roads"
    END
  END

  -----Original Message-----
  From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]On
Behalf Of WEST.BOB
  Sent: Thursday, September 23, 2004 11:38 AM
  To: MAPSERVER-USERS at LISTS.UMN.EDU
  Subject: [UMN_MAPSERVER-USERS] SET THE SCALE OF WHERE CLASSES OF FEATURES
DISPLAY


  I am new to mapserv. I am trying to set-up a map file for roads. I have a
field in my road shape file that has a number from 1 to 6. 6 is the
interstate, 5 are the major roads and it goes down to 1 that are private sub
division roads. I want to set-up one layer with 6 classes, one for each
class of roads. Then at different scales I want to set different classes of
roads to display and to show its name. Seams to me there should be a way to
set the color, the maximum and minimum scale that each class of roads line
shows and a separate setting to set the scale of its label. Can anyone give
me an example MAP file for doing this?



  The object of this is so that when I look at the full map all I see are
the interstates and as I zoom in I see more roads and more labels till I get
down to the point I see all roads and labels.



  Thanks

  Bob West
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