Fraud? Huh? When they say that these maps are the “most detailed” in their marketing materials they clearly mean that they are using a digital elevation model with higher resolution than the ones used to create other similar images available for sale elsewhere. They obviously use relatively standard digital photo printing processes, and are not implying otherwise. If you have your own source file, you can get it printed/mounted using similar technology from your favorite commercial print shop.
One can certainly produce a higher resolution image using various technologies (as you say, a photographic negative potentially has very high resolution). But so what? I really have no idea why you are talking about micrometers, diffraction gratings, and so on.
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Fraud? Huh? When they say that these maps are the “most detailed” in their marketing materials they clearly mean that they are using a digital elevation model with higher resolution than the ones used to create other similar images available for sale elsewhere. They obviously use relatively standard digital photo printing processes, and are not implying otherwise. If you have your own source file, you can get it printed/mounted using similar technology from your favorite commercial print shop.
One can certainly produce a higher resolution image using various technologies (as you say, a photographic negative potentially has very high resolution). But so what? I really have no idea why you are talking about micrometers, diffraction gratings, and so on.