*Tsolmon Renchin¹、Bayanjargal Darkhijav¹、Davaajargal Jargalsaikhan²、Enkhjargal Natsagdorj³、Batbayar Ganchudur¹ (1.National University of Mongolia, Mongolia、2.Institute of Mathematics and Digital technology Mongolian Academy of Sciences, Mongolia 、3.Dept. of Geography, Ghent University, Ghent, Belgium )