query: wrong results

Franziska Wenzel fw at urbanix.de
Sat Dec 2 07:17:17 PST 2000


I have still teh same problem:

For testing purposes I've managed to get a map with London Boroughs
(area) and tube stations (points) displayed, on mapserver 3.3.011 for Linux.

But when I do a query on objects, either the borough layer or the tube layer,
I sometimes get wrong results. Tolerance for points is 5 and for area is 1.
Within one borough different results are possible, a right one and wrong
ones which is the neigbouring borough (any direction).

I tested various tolerances, and tested different coordinates
(geographic and rectangular)

Any idea why this happens?
How is the reference done between the dbf-file and the map-objects? 

Thanks 
Franziska

Here is my map file, it's more or less the file from the ms_demo,
slightly adapted
for my purposes only, so it should work, I guess.

#
# Start of map file
#
NAME DEMO
STATUS ON
SIZE 580  460
SHADESET symbols/shade.sym
LINESET symbols/line.sym
MARKERSET symbols/marker.sym
EXTENT 503900.133726333 155850.12399045 561960.144833978 201720.08577298 
UNITS METERS
SHAPEPATH "data"
IMAGECOLOR 255 255 255

#LABELOVERLAP FALSE

#
# Start of web interface definition
#
WEB
  HEADER demo_header.html
  TEMPLATE demo.html
  MINSCALE 1
  MAXSCALE 15500000
  IMAGEPATH "/home/httpd/html/tmp/"
  IMAGEURL "/tmp/"
END

#
# Start of legend
#
LEGEND
  KEYSIZE 18 12
  LABEL
    TYPE BITMAP
    SIZE MEDIUM
    COLOR 0 0 89
  END
  STATUS ON
END

#
# Start of scalebar
#
SCALEBAR
  IMAGECOLOR 255 255 255
  LABEL
    COLOR 0 0 0	
    SIZE SMALL
  END
  SIZE 350 5
  COLOR 255 255 255
  BACKGROUNDCOLOR 0 0 0
  OUTLINECOLOR 0 0 0
  UNITS KILOMETERS
  INTERVALS 5
  STATUS ON
END

#
# Start of layer definitions
#

LAYER
  NAME boroughs
  TYPE POLYGON
  STATUS DEFAULT
  TOLERANCE 1
  DATA boroughs
  CLASS
    SYMBOL 0
    OUTLINECOLOR 150 120 10 
    COLOR 248 248 95
  END
QUERY
TEMPLATE boroughs.html
END
END

LAYER
  NAME tubestations
  TYPE POINT
  STATUS DEFAULT
  TOLERANCE 5
  DATA tubestations

  CLASS
    SYMBOL 7
    SIZE 7
    OUTLINECOLOR 150  10 10
    COLOR 150  10  10
  END
QUERY
TEMPLATE tubes.html
END
END


END # Map File



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