Assessment of Landslide Susceptibility by Decision Trees in the Metropolitan Area of Istanbul, Turkey

Table 2

General descriptive statistics of topographical variables with respect to landslides.

Data	Variable	Min.	Max.	Mean	Std.
					deviation
Grid cells with landslides (𝑁=53,674)	Altitude (m)	0.000	194.680	85.009	45.165
	Slope gradient	0.000	57.950	7.966	5.307
	(°)
	Plan curvature	–3.130	2.870	−0.013	0.238
	Profile	–2.930	3.080	0.023	0.303
	curvature
	Heat load	0.000	1.000	0.529	0.338
	Stream power	0.000	8.330	0.724	0.934
	index (SPI)
Grid cells without landslides (𝑁=226,041)	Altitude (m)	0.000	200.000	98.229	52.370
	Slope gradient	0.000	55.230	4.642	3.924
	(°)
	Plan curvature	–4.500	2.690	0.004	0.137
	Profile	–2.920	3.430	−0.004	0.188
	curvature
	Heat load	0.000	1.000	0.524	0.342
	Stream power	0.000	8.670	0.453	0.775
	index (SPI)