RT Journal T1 Study on the Arithmetic of Automatically Drawing Isoline of Groundwater Level Based on GIS A1 CHI Bao-ming, LI Zhi-jun, YE Yong, LIN Lan, SHI Feng-zhi PB Journal of Jilin University(Earth Science Edition) FD 2007-03-26 YR 2007 JF Journal of Jilin University(Earth Science Edition) JO Journal of Jilin University(Earth Science Edition) VO 37 IS 2 SP 261 DO K1 isoline; Delaunay triangulation; MapObject; Bezier curve; GIS; groundwater LK {http://xuebao.jlu.edu.cn/dxb/EN/article/article_8701.shtml}