[FWTools] Can someone help test a potential bug for me?

[Roger André]

Hi,

I'd like to ask for some help from a couple people running MapServer.  I
would like to know if others are able to replicate some strange behavior I
have noticed lately, and what versions of MapServer they are using.  Below
are the steps needed, they don't take very long.

Step 1.  Create a large rectangular image of Size 14400 x 7200.

Step 2.  Assign georeferencing to the image:
gdal_translate -a_ullr -180 90 180 -90 -a_srs "EPSG:4326" big_black.tif
wgs84_big_black.tif

Step 3. Load this image into a MapServer layer and set a contrasting
IMAGECOLOR in the mapfile (red works well).

Step 4. Make sure you have a spherical mercator projection defined in your
epsg file.
<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0
+y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs <>

Step 5. Make a WMS request for a tile that replicates one that TileCache
makes:
http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/test/test.map
&layers=imagery
&srs=EPSG%3A900913
&version=1.1.1
&bbox=-20037508.34%2C-20037508.34%2C-10018754.1704%2C-10018754.1704
&service=WMS
&width=256
&styles=
&format=image%2Fpng
&request=GetMap
&height=256

Step 6. Look at your resulting tile. Is it full of data from top to bottom,
or is there a band of IMAGECOLOR at the bottom?

Step 7.  Let me know your results.

Thanks very much!

Roger
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