> A recent thread on p.b.i. drew my attention to http://www.buining.com - 
> those 16-bit PNG elevation maps of Earth, the Moon and Mars look 
> tempting! But AFAIK PoV-Ray's height_field functionality can't handle 
> grayscale 16-bit PNGs...

It should work. From the documentation of height fields:

"PNG format heightfields are usually stored in the form of a grayscale 
image with black corresponding to lower and white to higher parts of the 
height field. Because PNG files can store up to 16 bits in grayscale 
images they will be as smooth as TGA and PPM images."

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