[Mapserver-users] Logical expressions in CLASS EXPRESSION

[Stefanie Weykam]

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Hi folks,
I have some problems specifying the class by a logical expression in my map
file.

I am running MapsServer4.2 on Windows and the layer is a shape file. Data
type of the field IS numeric (int) and field name IS correct. 


 CLASSITEM   "Riq50" 
 CLASS
    EXPRESSION   ([Riq50]>1) 
    COLOR         255 0 0
    OUTLINECOLOR  0 0 0 
 END  

This expression works:  EXPRESSION   '1' 
This one doesn't:           EXPRESSION   ([Riq50]>1) 
..which makes me think that the expression is (always? by default?) a string
comparison expression and the field is read as string. At least as long as
the data type of the field is string or int - no results with real numbers
though.

I have tried all combinations of brackets and quotes and still don't get
anywhere. Can anybody give me a clue on that???

My aim is actually to render quantitative data (lets say 4 o 5 classes)
according to (whatever) data ranges found in the selected data field. I will
have to intercept the min and max values of the selected field, divide the
values into 4 or 5 classes (or perhaps quantiles) and assign colors and data
ranges by logical expressions to the classes.

Is there any example out there or could somebody give me one?

Stefanie





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