[UMN_MAPSERVER-USERS] Problem with reprojected images

[Dirk Jesko]

Hi,

I set up a WMS for aerial images. The images are projected in 
Gauss-Krueger 3 and have a size of one square kilometer. The WMS also 
provides other projections, e.g. Gauss-Krueger 2-5, UTM, etc. If I query 
the WMS with a projection other than the original one, I get little 
white lines along the edges of the tiles (see the attached image). The 
image format does not matter. How do I get rid of these? I can not find 
any option that might be related to this. By the way, this also happens 
if the data is accessed via mapscript or as normal cgi.

Thanks for any help.

Regards,
Dirk

Here a part of the mapfile:

MAP
...
IMAGECOLOR      255 255 255
EXTENT          3100000 5200000 4100000 6200000
SIZE            500 500
SHAPEPATH       "/data/daten/WMS"

PROJECTION
  "init=epsg:31467"     # GK 3
END

WEB
  METADATA
    ...
    "wms_srs" "EPSG:31467 EPSG:31466 EPSG:31468 EPSG:31469 EPSG:32632 
EPSG:32633 EPSG:4326"
    "wms_encoding" "UTF-8"
    "wms_feature_info_mime_type" "application/vnd.ogc.gml"
  END

  MAXSCALE   10000000
  MINSCALE   1000

  ...
END

OUTPUTFORMAT
  NAME png24
  DRIVER "GD/PNG"
  MIMETYPE "image/png"
  IMAGEMODE RGB
  EXTENSION "png"
  FORMATOPTION "INTERLACE=ON"
END
OUTPUTFORMAT
  NAME png
  DRIVER "GD/PNG"
  MIMETYPE "image/png"
  IMAGEMODE PC256
  EXTENSION "png"
  FORMATOPTION "INTERLACE=ON"
END
OUTPUTFORMAT
  NAME jpeg
  DRIVER "GD/JPEG"
  MIMETYPE "image/jpeg"
  IMAGEMODE RGB
  EXTENSION "jpg"
  FORMATOPTION "QUALITY=95"
  FORMATOPTION "PROGRESSIVE=ON"
END

...

LAYER
  NAME         "img02000"
  GROUP        "img"
  TILEINDEX    "IMG_02000.shp"
  TILEITEM     "locationUn"
  TYPE         RASTER
  MAXSCALE     500000.0
  MINSCALE     100000.0
  PROJECTION
    "init=epsg:31467"     # GK 3
  END
  METADATA
     ...
  END
END

...

END
<<attachment: wms.jpg>>