New record for the largest Internet image
10 March 2004
News
Thought to be the world's largest image served over the Internet, and the largest image of the Earth, Earth Resource Mapping recently completed a World Geocover Mosaic from Landsat satellite imagery, that comprises over 600 separate images. Each of these is a mosaic of about 10 to 15 Landsat scenes, totalling two terabytes of imagery. They were mosaiced and compressed using a pre-release version of ER Mapper 6.4.
The final mosaic covers almost the entire landmass of the planet Earth at 30 metre resolution. The image measures 1,4 million pixels wide by half a million pixels high. The 2 Terabytes of raw data has been compressed to an ECW (enhanced compression wavelet) file that is 26 Gigabytes in size - a compression ratio of 80:1.
The image can be viewed on the web ( www.earthetc.com/world/</a>) using Earth Resource Mappings Image Web Server technology. As well as direct web browser access the image can be opened in desktop applications that natively support ECW files, or by downloading many of the free supporting plug-ins.
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