Celestia Forums

Ron, the Western Australian DOLA image of Perth at .4 m resolution is about 32 GB.
ECW compresses it to about 8-9GB.

Thanks for the tip, but unfortuneately I've already been wrangling ECW's on home computer for the past few years. :)

Here's a funny thing - I went to the DjVu site and discovered it's originated from LizardTech who two years back went head to head with Ermapper in the U.States by bringing a court action claiming patent ownership of wavelet compression methods for geophysical / earth images. LizardTech lost. Now, w...

A wavelet based, projection encoded compressed file format is definitely the way to go. Ermapper's ECW is used to hold very large (terrabyte sized) images mosaiced together from aerial and satelite sources, and the resulting files can be rapidly panned and zoomed, even across 56K modem's. In keeping...