How might I enable Quantum GIS to read ECW imagery?
At the moment I'm mostly concerned about this on Ubuntu 10.4 amd64, but I also use WinXP & Win7.
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The latest build for QGIS 1.5 for Windows has support for ECW, the link is: http://www.qgis.org/downloads/QGIS-OSGeo4W-1.5.0-14109-Setup.exe
When it comes to Ubuntu 10.4 I'm also pretty sure the latest build comes with it too, although I might be mistaken as I don't use Ubuntu a hell of a lot.
For Windows http://forum.qgis.org/viewtopic.php?f=3&t=6935
see image screenshot for correct location of the .dll's in Windows by 'hoohoo' at the bottom of the post
I was having a lot of trouble getting .ecws to work on QGIS 1.8 running via OSGeo4W on Win 7.
Initially I followed the instructions on http://www.northrivergeographic.com/qgis-getting-sid-and-ecw-image-formats-to-work-on-osgeo4w-install. I couldn't find the libraries he mentions for GDAL 1.9 in the installer, so installed the ones for 1.7, but that didn't work.
I then followed the instructions here: http://www.faunalia.pt/node/438, which were much more simple. I just went straight over the top of the previous changes I'd made to the OSGeo4W installation - didn't reinstall or anything.
Then I restarted the computer and I can now load up .ecws.