ECW
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ECW File format
ECW is a proprietary wavelet compression image format optimized for aerial and satellite imagery. See complete article about ECW in wikipedia.
ECW Read Support
A new version of ECW support based on ERDAS ECW/JP2 SDK version 3.3 is available since OpenJUMP 1.4.3. One advantage of the new SDK is that it gives also access to JPEG2000 format. It is included by default into the PLUS edition of OpenJUMP. You can however add them manually to OpenJUMP CORE if you want to.
Download
Download it here and follow the instruction of the included readme.txt file
Interesting links about ECW
WCS issues from deegree website (2007)