[mapserver-users] Two rasters covering each other at the same scale

[Steve Lime]

I assume what's happening is that you're running out of colors. When
that happen matches
are made based on proximity which can lead to some funky results. 3.7
should fix this with
24-bit PNG output. For older versions the only workaround is reducing
the number of colors
in images OR do some palette matching so that the images don't need as
many colors.

Steve

Stephen Lime
Data & Applications Manager

Minnesota DNR
500 Lafayette Road
St. Paul, MN 55155
651-297-2937

>>> "Branko Kmetec" <branko.kmetec at mb.birostroj-co.si> 09/12/02 10:43AM
>>>
Has someone idea, why do i get strange picture like on link:
http://mail.mb.birostroj-co.si/map.png. I get it only when two rasters
are covering at the same scale.

Here's also my map file:

MAP
  EXTENT 369144 11687 630856 208313
  IMAGECOLOR 255 255 255
  IMAGEQUALITY 75
  IMAGETYPE PNG
  INTERLACE TRUE
  SHAPEPATH "./data/"
  SIZE 400 300
  STATUS ON
  TRANSPARENT FALSE
  UNITS KILOMETERS
  NAME "DARS d.d."

  LEGEND
    IMAGECOLOR 255 255 255
    INTERLACE TRUE
    KEYSIZE 20 10
    KEYSPACING 5 5
    LABEL
      SIZE MEDIUM
      TYPE BITMAP
      BUFFER 0
      COLOR 255 255 0
      FORCE FALSE
      MINDISTANCE -1
      MINFEATURESIZE -1
      OFFSET 0 0
      PARTIALS TRUE
    END
    POSITION LL
    STATUS OFF
    TRANSPARENT FALSE
  END

  QUERYMAP
    COLOR 255 255 0
    SIZE -1 -1
    STATUS OFF
    STYLE HILITE
  END

  REFERENCE
    COLOR -1 -1 -1
    EXTENT 369144 11687 630856 208313
    IMAGE "./images/slovenija.png"
    OUTLINECOLOR 255 0 0
    SIZE 100 75
    STATUS ON
      MARKER 0
      MARKERSIZE 0
      MINBOXSIZE 3
      MAXBOXSIZE 0
  END

  SCALEBAR
    BACKGROUNDCOLOR 1104913136 72 16057808
    COLOR 255 255 0
    IMAGECOLOR 255 255 255
    INTERLACE TRUE
    INTERVALS 4
    LABEL
      SIZE MEDIUM
      TYPE BITMAP
      BUFFER 0
      COLOR 255 255 0
      FORCE FALSE
      MINDISTANCE -1
      MINFEATURESIZE -1
      OFFSET 0 0
      PARTIALS TRUE
    END
    POSITION LL
    SIZE 200 3
    STATUS OFF
    STYLE 0
    TRANSPARENT FALSE
    UNITS MILES
  END

  WEB
    IMAGEPATH "/usr/local/www/htdocs/dars_web/tmp/ac/"
    IMAGEURL "/tmp/ac/"
    MAXSCALE 1e+008
    MINSCALE 5.0e+007
  END

  LAYER
    DATA "ac-mala.png"
    MINSCALE 5.5e+008
    NAME "AC mala"
    SIZEUNITS PIXELS
    STATUS ON
    TOLERANCE 3
    TOLERANCEUNITS PIXELS
    TYPE RASTER
    UNITS METERS
    CLASS
      NAME "AC mala"
      MAXSIZE 100
      MINSIZE 1
      SIZE 1
      SYMBOL 0
    END
  END

  LAYER
    DATA "ac.png"
    MAXSCALE 5.5e+008
    MINSCALE 1.0e+007
    NAME "AC"
    SIZEUNITS PIXELS
    STATUS ON
    TOLERANCE 3
    TOLERANCEUNITS PIXELS
    TYPE RASTER
    UNITS METERS
    CLASS
      NAME "AC"
      MAXSIZE 100
      MINSIZE 1
      SIZE 1
      SYMBOL 0
    END
  END

  LAYER
    DATA "obroc.png"
    MAXSCALE 2.0e+008
    MINSCALE 1.0e+007
    NAME "obroc"
    SIZEUNITS PIXELS
    STATUS DEFAULT
    TOLERANCE 3
    TOLERANCEUNITS PIXELS
    TYPE RASTER
    UNITS METERS
    CLASS
      NAME "Obroc"
      MAXSIZE 100
      MINSIZE 1
      SIZE 1
      SYMBOL 0
      BACKGROUNDCOLOR 0 0 0
    END
  END

END

Regards,

Brane