Hi,<br><br>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.<br>
<br>Step 1. Create a large rectangular image of Size 14400 x 7200.<br>
<br>Step 2. Assign georeferencing to the image:<br>gdal_translate -a_ullr -180 90 180 -90 -a_srs "EPSG:4326" big_black.tif wgs84_big_black.tif<br><br>Step 3. Load this image into a MapServer layer and set a contrasting IMAGECOLOR in the mapfile (red works well).<br>
<br>Step 4. Make sure you have a spherical mercator projection defined in your epsg file.<br><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 <><br>
<br>Step 5. Make a WMS request for a tile that replicates one that TileCache makes:<br><a href="http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/test/test.map" target="_blank">http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/test/test.map</a><br>
&layers=imagery<br>&srs=EPSG%3A900913<br>&version=1.1.1<br>&bbox=-20037508.34%2C-<div id=":wm" class="ArwC7c ckChnd">20037508.34%2C-10018754.1704%2C-10018754.1704<br>&service=WMS<br>&width=256<br>
&styles=<br>&format=image%2Fpng<br>
&request=GetMap<br>&height=256<br><br>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?<br><br>Step 7. Let me know your results.<br><br>Thanks very much!<br>
<br>Roger<br>--<br></div><br>