GIS-based gully erosion susceptibility modeling, adapting bivariate statistical method and AHP approach in Gombe town and environs Northeast Nigeria

Geoenvironmental Disasters

Table 13 Showing FR values for curvature

Factor	factor classes	No. of points	% of points	class area	% of class area	Frequency ratio	Relative frequency
Curvature	Convex	17,066.91	15.92	105,704	18.23	0.87	0.27
	Flat	59,734.17	55.75	361,217	62.29	0.89	0.27
	Concave	30,341.17	28.31	112,898	19.47	1.45	0.45
	Sum	107,142.2	100	579,819	100	3.22	1