Printing size of very large images

Imagine we have a Very Large Image (such as the one generated from NASA Blue Marble NG).
The dimensions in pixels are 86400 x 43200 (remember it's the Earth at 500 m/pixel).

My screen (20 inches 16/10 DELL 2005 FPW) dimensions are about 44 cm x 27 cm (17 x 10.6 inches) for 1680 x 1050 pixels.
Simple math gives us 86400 / 1680 = 52 and 43200 / 1050 = 41.
This means that in order to view the complete image, we would need a matrix of 52 x 41 = 2132 monitors !!

Now lets' go to printing. Maximal resolution the eye can distinguish is about 254 DPI (100 pixels / cm). Now this means that the printed size of the image is : 86400 / 100 = 864 cm and
43200 / 100 = 432 cm (340 x 170 inches). This is huge, it would require more than 640 A4 sheets of paper !!


I have a poster printed from the NASA image. It's about 122 x 76 cm and has been printed at 254 DPI. While it's already very nice, it's only 1/8 of the possible printed size at full resolution.
Here is a small version :