[mapserver-users] MINSCALEDENOM, MAXSCALEDENOM help/tutorial?

[Chris Kantarjiev]

I've got a large map that, for various reasons, wants to have all the layers on by default. Since 
it's all the streets in the US, some of them highlighted by size, it takes a long time to draw - in 
fact, mapserver often takes too long to respond, such that apache times out.

I'm trying to use the MIN/MAXSCALEDENOM to control display. The examples are not immediately 
helpful, since they only use a single value, and don't leave me with a sense of how "min" or "max" 
applies.

For example - which of these is correct if I want the layer to only appear when the map scale is 
lower than 1:50000 (that is, between 1:1 and 1:50000, or rather, with very small features shown)?

   LAYER
     NAME "controlled-access-fc5"
     TYPE LINE
     STATUS DEFAULT
     TILEINDEX /maps/NAVTEQ/20092FC14/USstreets.shp
     TILEITEM "LOCATION"

     CLASS
       NAME "Controlled Access FC5"
       EXPRESSION (('[FUNC_CLASS]' eq '5') and ('[CONTRACC]' eq 'Y'))
       MAXSCALEDENOM 50000
       STYLE
         SYMBOL 1
         SIZE 3
         COLOR 0 255 0
      END
     END
   END

or

   LAYER
     NAME "controlled-access-fc5"
     TYPE LINE
     STATUS DEFAULT
     TILEINDEX /maps/NAVTEQ/20092FC14/USstreets.shp
     TILEITEM "LOCATION"

     CLASS
       NAME "Controlled Access FC5"
       EXPRESSION (('[FUNC_CLASS]' eq '5') and ('[CONTRACC]' eq 'Y'))
       MINSCALEDENOM 50000
       STYLE
         SYMBOL 1
         SIZE 3
         COLOR 0 255 0
      END
     END
   END