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

Geoenvironmental Disasters

Table 8 Showing FR values for elevation classes

	factor classes	No. of points	% of points	class area	% of class area	Frequency ratio	Relative frequency
Elevation	330 –414 m	28,444.84	26.54	149,566	48.82	0.54	0.09
	414 –477 m	51,200.72	47.78	156,698	37.54	1.27	0.22
	477 –544 m	22,755.87	21.23	104,788	10.28	2.06	0.36
	544 –611 m	4740.807	4.42	105,167	2.52	1.75	0.31
	611 –721 m	0	0	63,600	0.81	0	0
	Sum	107,142.2	100	579,819	100	5.63	1