[mapserver-users] How does SYMBOLSCALEDENOM work

[Jackey Cheung]

Hi All,

I've got a layer like this:

LAYER
NAME "country"
STATUS DEFAULT

TYPE POLYGON
UNITS METERS

CONNECTIONTYPE POSTGIS
CONNECTION "..................."
DATA "geom FROM view_country_en USING UNIQUE oid USING SRID=4326"

PROCESSING "LABEL_NO_CLIP=ON"
PROCESSING "CLOSE_CONNECTION=DEFER"

PROJECTION
"init=epsg:4326"
END
 LABELITEM "sname"
SYMBOLSCALEDENOM 15000000
 CLASS
STYLE
COLOR 230 230 220
END

LABEL
MINSIZE 7
MAXSIZE 24
ANGLE [angle]
PRIORITY [priority]
COLOR 0 0 0
OUTLINECOLOR 255 255 240
OUTLINEWIDTH 2
TYPE TRUETYPE
ENCODING "UTF-8"
FONT "arial-bold"
SIZE 24
BUFFER 5
POSITION AUTO
PARTIALS FALSE
WRAP " "
ALIGN CENTER
MAXLENGTH 0
MINFEATURESIZE AUTO
END
END
END

At scale 1:1693, the map appears normally (1693.png). While zoomed in to
1:846, the country layers is gone (8461.jpg). But if I comment out the
line SYMBOLSCALEDENOM line, or change the it to a smaller number, the
country layer is rendered normally (8462.jpg).

Why?
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