jgg     2015 35 (1):  140-144    ISSN: 0412-1961  CN: 21-1139/TG The Key Technology of Seabed Sediment Classification  System based on Echo Intensity School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China Received: 2014-02-12  Revised: null  Online: 2015-02-06 Supporting info