Stepwise integration of analytical hierarchy process with machine learning algorithms for landslide, gully erosion and flash flood susceptibility mapping over the North-Moungo perimeter, Cameroon

Mfondoum, Alfred Homère Ngandam; Nguet, Pauline Wokwenmendam; Seuwui, Dieudonné Tchokona; Mfondoum, Jean Valéry Mefire; Ngenyam, Henry Bang; Diba, Ibrahima; Tchindjang, Mesmin; Djiangoue, Bertin; Mihi, Ali; Hakdaoui, Sofia; Batcha, Roseline; Tchatchouang, Frédéric Chamberlain Lounang; Petcheu, Igor Casimir Njombissie; Beni, Luc Moutila

doi:10.1186/s40677-023-00254-5

Geoenvironmental Disasters

Table 4 Collinearity of factors

From: Stepwise integration of analytical hierarchy process with machine learning algorithms for landslide, gully erosion and flash flood susceptibility mapping over the North-Moungo perimeter, Cameroon

Landslide	Tol	VIF	Gully erosion	Tol	VIF	Flash flood	Tol	VIF
Elevation	0.685	1.459	Elevation	0.559	1.786	Elevation	0.413	2.415
Slope	0.699	1.429	Slope	0.679	1.472	Slope	0.391	2.556
Slope aspect	0.866	1.153	Slope aspect	0.875	1.142	Slope aspect	0.893	1.118
Plan curvature	0.871	1.147	Plan curvature	0.878	1.138	Plan curvature	0.39	2.557
Profile curvature	0.808	1.236	Profile curvature	0.806	1.239	Profile curvature	0.515	1.938
Relative slope position	0.472	2.115	Relative slope position	0.689	1.45	Relative slope position	*Excl*	*Excl*
TRI	0.494	2.022	TRI	0.544	1.835	TRI	0.4	2.496
LS	0.79	1.265	LS	0.78	1.281	LS	*N/A*	*N/A*
Valley depth	0.484	2.065	Valley depth	0.543	1.841	Valley depth	0.409	2.44
Lithology	0.449	2.223	Lithology	0.585	1.706	Lithology	0.482	2.073
Fault density	0.808	1.236	Fault density	0.792	1.261	Fault density	*N/A*	*N/A*
Distance to fault	0.835	1.196	Distance to fault	0.834	1.198	Distance to fault	*N/A*	*N/A*
Soil depth	0.6	1.664	Soil depth	0.377	2.649	Soil depth	0.654	1.528
Soil type	0.542	1.842	Soil type	0.387	2.578	Soil type	0.556	1.797
Drainage density	0.548	1.822	Drainage density	0.56	1.783	Drainage density	0.663	1.506
Distance to stream	0.751	1.331	Distance to stream	0.771	1.296	Distance to stream	0.763	1.309
Channel network distance	0.539	1.853	Channel network distance	0.527	1.896	Channel network distance	0.599	1.667
SPI	0.974	1.026	SPI	0.977	1.023	SPI	0.984	1.016
TWI	0.72	1.387	TWI	0.721	1.385	TWI	0.87	1.149
Rainfall-IDW	0.511	1.953	Rainfall-MFI	0.648	1.542	Rainfall-IDW	0.744	1.343
Distance to road	0.59	1.694	Distance to road	0.617	1.618	Distance to road	*N/A*	*N/A*
Road density	0.646	1.546	Road density	0.652	1.532	Road density	*N/A*	*N/A*
LULC	0.91	1.098	LULC	0.891	1.121	LULC	0.933	1.071
SEVI	0.903	1.106	SEVI	0.9	1.11	SEVI	0.908	1.101

The bold values has been used for all numbers representing the two collinearity metrics used here, i.e., Tolerance (Tol) and Variance Inflation Factor (VIF)
Excl. = layer excluded for a too high VIF (3.078), although a good TOL (0.324); N/A= Not Applied to the model

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