[Mapserver-users] Logical expressions in CLASS EXPRESSION
Gerry Creager N5JXS
gerry.creager at tamu.edu
Mon Jul 26 08:27:51 EDT 2004
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See if this snippet helps. It's a piece from a known, working mapfile.
gerry
Stefanie Weykam wrote:
> 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
>
>
>
>
--
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843
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Content-Type: text/plain;
name="pwv.map"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="pwv.map"
### This is an extract of a working mapserver mapfile.
### The class statements allow a different color to be used.
### This is NOT a complete mapfile.
SYMBOL
NAME 'pwvcircle'
TYPE ELLIPSE
FILLED TRUE
POINTS 10 10 END
END
#
# PWV values
#
LAYER
#SIZEUNITS pixels
PROJECTION
"init=epsg:4269"
END
CLASSITEM "pwv"
NAME weather-pwv
TYPE POINT
DATA currentWeather
#DATA currentPWV
STATUS ON
# LABELCACHE on
LABELITEM "pwv"
SIZEUNITS kilometers
CLASS
EXPRESSION ([pwv] >= 0.0 AND [pwv] <= 0.05)
NAME 'PWV 0.00-0.05 in'
COLOR 224 224 224
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
# BUFFER -10 #-15
BUFFER 1 ### Changed 2003-07-13
PARTIALS TRUE
END
END
CLASS
NAME '0.05-0.20 in'
EXPRESSION ([pwv] > 0.05 and [pwv] <= 0.20)
COLOR 117 117 0
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
# BUFFER -10
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '0.20-0.40 in'
EXPRESSION ([pwv] > 0.20 and [pwv] <= 0.40)
COLOR 255 0 0
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '0.40-0.60 in'
EXPRESSION ([pwv] > 0.40 and [pwv] <= 0.60)
COLOR 255 145 46
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '0.60-0.80 in'
EXPRESSION ([pwv] > 0.600 and [pwv] <= 0.80)
COLOR 255 237 26
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '0.80-1.00 in'
EXPRESSION ([pwv] > 0.80 and [pwv] <= 1.00)
COLOR 166 255 18
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '1.00-1.20 in'
EXPRESSION ([pwv] > 1.00 and [pwv] <= 1.20)
COLOR 102 255 0
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '1.20-1.40 in'
EXPRESSION ([pwv] > 1.20 and [pwv] <= 1.400)
COLOR 15 255 128
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '1.40-1.60 in'
EXPRESSION ([pwv] > 1.400 and [pwv] <= 1.600)
COLOR 18 224 255
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '1.80-1.60 in'
EXPRESSION ([pwv] > 1.60 and [pwv] <= 1.800)
COLOR 18 191 255
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '1.80-2.00 in'
EXPRESSION ([pwv] > 1.800 and [pwv] <= 2.00)
COLOR 8 89 255
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
CLASS
NAME '>2.00 in'
EXPRESSION ([pwv] > 2.00)
COLOR 0 0 255
SYMBOL 'pwvcircle'
SIZE 15
LABEL
FORCE TRUE
COLOR 140 0 160
TYPE BITMAP
SIZE MEDIUM
POSITION UC
OFFSET 2 2
BUFFER 1
PARTIALS TRUE
END
END
END
END # Map File
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