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| | Abstract | | The Landsonar and Differential electric sounding method were new technique used in recent years .Good results from shallow engineering surveys have been obtained . Landsonar used high and super wide-band frequency , not only advancing greatly the resolution but also avoiding the interference of the vibratory noise of passerby , cars and other machines . The C-1 DES machine can avoid the interference of stray electricity and have high resolution . Those two methods can adapt for surveying in city, even in busy and noise city . Their advantages was proved in the practice projects and get the good effect in shallow high resolution survey in city. |
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