<div dir="ltr">One thing I did notice is that my EPSG file definition for "Spherical Mercator" is missing a parameter, "+nadgrids=@null". I'll test tomorrow to see if adding it to the definition removes the problem.<br>
--<br><br><br><div class="gmail_quote">On Sat, Oct 18, 2008 at 7:25 PM, Roger André <span dir="ltr"><<a href="mailto:randre@gmail.com">randre@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir="ltr">This is probably more of a TileCache question, than a MapServer one, but I figure one of you may have had the same issue in the past. I'm using MapServer to feed TileCache a fairly large GeoTiff with global extents, which I'm then displaying in Google Maps as a tile layer. This has worked well in the past, but now I'm encountering a weird problem. Some of my tiles are being rendered by MapServer with a row of pixels missing on the bottom of the image. So for example, in Zoom Level 2, all of the 0.png tiles will be 256 x 256 pixels, but row 256 will not contain data from my global image, but instead will be set entirely to whatever background color I have set in my Mapfile. The problem appears in multiple, but not all, Zoom levels, and at different geographic locations, but always at the bottom row of a tile.<br>
<br>The source image doesn't have the lines in then, so I have to believe that the "dead" row is an artifact of the rendering process. My seed image is in lat/lon WGS84, and the tiles are being requested in EPSG:900913. The reprojection seems to be working correctly, insofar as image lineup with Google Maps seems to indicate. If I take the seed image and create a very reduced resolution version of it, then run it through TileCache, I don't get any lines. So it seems like the lines *might* be a result of downsampling, but since they're not present at the bottom of every image, I'm not convinced that's the problem.<br>
<br>Oh, and I'm using the GD driver.<br><br>Any ideas?<br><br>Roger<br>--<br></div>
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