Table 3. The parameters of the standard deviation ellipse for cultivated land.

	Centroid displacement	Migration rate	Major axis variation	Minor axis variation
1990∼1995	11.03	2.21	4,291.09	−4,766.21
1995∼2000	5.13	1.03	2014.24	3,562.32
2000∼2005	14.80	2.96	9,146.22	1,458.65
2005∼2010	2.75	0.55	−2,573.53	−436.13
2010∼2015	6.37	1.27	42.49	−171.37
2015∼2020	3.29	0.66	−570.08	1,208.14