New answers tagged ecw
Few years ago I did the same job very successfully with AU ECW Compressor (I've merged 49 ECWs or 7x7, into one ECW). It's free, also it's a very small program and easy to use. You could also make/save settings as scripts and run it later. http://www.advisory-unit.org.uk/site/aegis3/aegis_ecw.html The Free Advisory Unit ECW Compressor is a simple ...
ERDAS ER Mapper would seem to be the logical first choice to investigate because my understanding is that the ECW format was developed in that product.
Apollo can handle various image formats including geotiff, rrd, img, etc. If you already have your images in tiff format it makes sense to simply use that.
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