jgg     2011 31 (1):  117-122    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH ON GRAPHIC CONVERSION METHOD AND PROGRAM IMPLEMENTATION BASED ON DXF FILE Yao Yibin ;and Kong Jian School of Geodesy and Geomatics, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null