translate.google.com says: "in cooperation with our Mapmaniac Werner Lenz, we are just about to calibrate the following sets of maps in ECW format. "

ECW (Enhanced Compression Wavelet) is a proprietary wavelet compression image format optimized for aerial and satellite imagery. It was developed by Earth Resource Mapping, and is now owned by Leica Geosystems[1]. The lossy compression format efficiently compresses very large images with fine alternating contrast.