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From: rick@hanauma.stanford.edu (Richard Ottolini)
Newsgroups: sci.misc,comp.graphics
Subject: Re: satellite pictures
Message-ID: <7113@lindy.Stanford.EDU>
Date: 11 Jan 90 23:19:38 GMT
References: <1523@castle.ed.ac.uk> <556@erm.oz>
Sender: news@lindy.Stanford.EDU (News Service)
Reply-To: rick@hanauma.UUCP (Richard Ottolini)
Organization: Stanford University, Dept. of Geophysics
Lines: 10

In article <556@erm.oz> sns@erm.oz (Stuart Nixon) writes:
>In article <1523@castle.ed.ac.uk>, nick@lfcs.ed.ac.uk (Nick Rothwell) writes:
>> Recently I heard of satellite pictures that revealed buried ruins
>> in the Sahara desert. I have a simple question. Is this true ?

Radar can see several meters below below the surface under optimal conditions
depending on wavelength, dryness, and soil grain size.
I've heard some sites have been imaged directly by radar rather than by
secondary visual effects, and I believe the Sahara was one of these
successful places.