Error loading MrSID in mapserver

[benft]

Hello, Our mapserver project has a raster layer composed of tile-indexed MrSID images. When zoomed in to scales greater than ~20000 they load OK. At smaller scales, we get this error in the apache error.log:

Premature end of script headers: php-cgi.exe

Sometimes, instead, we get these PHP errors:

PHP Warning: Error: msDrawMap(): Failed to draw layer named 'VGIN Aerials'. in ...chameleon\htdocs\common\wrapper\drawmap.php on line 534 PHP Warning: Error: MrSIDRasterBand::IRasterIO(): Failed to load image. mg2 somethi: GDALRasterIO() failed: drawGDAL() in ...chameleon\htdocs\common\wrapper\drawmap.php on line 534

I see a 2-year old unresolved ticket here for what looks like the same problem:

ticket 914 "MrSID fails in MapServer" see: http://trac.osgeo.org/gdal/ticket/914

We're using gdal 1.3.2 with the Lizardtech MrSid code compiled in.

Has it been fixed?

Thanks, Ben Thompson

[warmerdam]

Ben,

I'm not aware of any fixes having been incorporated as a result of #914. However, there have been quite a few changes to the mrsid driver since 1.3.2 as listed at:

http://trac.osgeo.org/gdal/log/trunk/gdal/frmts/mrsid?action=stop_on_copy&rev=12396&stop_rev=&mode=follow_copy

I think r10655 (related to bug #1446) looks like the most likely significant fix in this period and has also been incorporated in the 1.4 branch as r10654.

I would suggest you upgrade to at least GDAL 1.4.2 and see if the problem persists. If so, you will need to isolate the bug in some fashion I can reproduce for me to followup.

[warmerdam]

Ben,

Lacking feedback, I'm closing this. Feel free to reopen it if you have more information, or if you can provide a concrete test case that demonstrates the issue with a modern GDAL.