Effect of Landslide Factor Combinations on the Prediction Accuracy of Landslide Susceptibility Maps in the Blue Nile Gorge of Central Ethiopia

Meten, Matebie; PrakashBhandary, Netra; Yatabe, Ryuichi

doi:10.1186/s40677-015-0016-7

Geoenvironmental Disasters

Table 1 Frequency ratio value calculation by rationing landslide percentage to area percentage

From: Effect of Landslide Factor Combinations on the Prediction Accuracy of Landslide Susceptibility Maps in the Blue Nile Gorge of Central Ethiopia

Factor	Class	# landslide	% landslide	# area	% area	FRV =
		Pixels	Pixels ^a	Pixels	Pixels ^b	(a/b)
Slope (°)	0 - 5	60	0.388	38089	8.770	0.04
	5 - 10	333	2.151	87417	20.129	0.11
	10 - 15	811	5.239	102933	23.702	0.22
	15 - 20	1430	9.238	77279	17.794	0.52
	20 - 30	4195	27.099	80829	18.612	1.46
	30 - 40	4589	29.645	34095	7.851	3.78
	40 - 67	4062	26.240	13645	3.142	8.35
Aspect	Flat	5	0.03	1234	0.284	0.11
	N	424	2.74	29729	6.845	0.40
	NE	1013	6.54	44175	10.172	0.64
	E	2127	13.74	64829	14.928	0.92
	SE	3136	20.26	60584	13.950	1.45
	S	2306	14.90	52443	12.076	1.23
	SW	3144	20.31	73195	16.854	1.21
	W	2366	15.28	67137	15.459	0.99
	NW	959	6.20	40961	9.432	0.66
Plan curvature	- 10.7829 - - 1.7917	620	4.005	2810	0.647	6.19
	- 1.7917 - - 0.9103	1704	11.008	20924	4.818	2.28
	- 0.9103 - - 0.1111	4986	32.209	154198	35.506	0.91
	- 0.1111 - 0.1111	1724	11.137	78020	17.965	0.62
	0.1111 - 0.5882	3117	20.136	121053	27.874	0.72
	0.5882 - 1.3815	2315	14.955	49643	11.431	1.31
	1.3815 - 11.7830	1014	6.550	7639	1.759	3.72
Profile curvature	- 10.9947 - - 2.3629	767	4.955	3648	0.840	5.90
	- 2.3629 - - 1.0810	1984	12.817	23076	5.314	2.41
	- 1.0810 - - 0.1154	4045	26.130	151550	34.896	0.75
	- 0.1154 - 0.1154	1332	8.605	74725	17.206	0.50
	- 0.1154 - 0.7991	3358	21.693	134940	31.072	0.70
	0.7991 - 1.9956	2737	17.681	40629	9.355	1.89
	1.9956 - 10.8837	1257	8.120	5719	1.317	6.17
Distance from river	0 - 100	5975	38.60	173853	40.032	0.96
(m)	100 - 200	3728	24.08	116838	26.903	0.90
	200 - 300	2305	14.89	63633	14.652	1.02
	300 - 400	1323	8.55	34376	7.916	1.08
	400 - 500	810	5.23	19283	4.440	1.18
	500 - 600	480	3.10	11048	2.544	1.22
	600 - 700	350	2.26	6352	1.463	1.55
	700 - 800	223	1.44	3866	0.890	1.62
	800 - 900	102	0.66	2253	0.519	1.27
	900 - 1000	49	0.32	1351	0.311	1.02
	1000 - 1100	74	0.48	748	0.172	2.78
	1100 - 1200	47	0.30	485	0.112	2.72
	1200 - 1300	14	0.09	150	0.035	2.62
	1300 - 1400	0	0.00	46	0.011	0.00
	1400 - 1500	0	0.00	5	0.001	0.00
Factor	Class	# landslide	% landslide	# area	% area	FRV =
		Pixels	Pixels^a	Pixels	Pixels^b	(a/b)
Distance from	0 - 200	11297	72.978	108715	25.033	2.92
Lineament (m)	200 - 400	2017	13.030	84627	19.486	0.67
	400 - 600	930	6.008	61629	14.191	0.42
	600 - 800	487	3.146	47825	11.012	0.29
	800 - 1000	236	1.525	36076	8.307	0.18
	1000 - 1200	169	1.092	26915	6.198	0.18
	1200 - 1400	175	1.130	23374	5.382	0.21
	1400 - 1600	119	0.769	18887	4.349	0.18
	1600 - 1800	42	0.271	12387	2.852	0.10
	1800 - 2000	6	0.039	7334	1.689	0.02
	2000 - 2200	2	0.013	3926	0.904	0.01
	2200 - 2400	0	0.000	1634	0.376	0.00
	2400 - 2600	0	0.000	576	0.133	0.00
	2600 - 2800	0	0.000	281	0.065	0.00
	2800 - 3000	0	0.000	101	0.023	0.00
Land use	Agricultural land	7518	48.566	290914	66.987	0.725
	Sparse forest	706	4.561	10747	2.475	1.843
	Rural settlement	55	0.355	16384	3.773	0.094
	Barren land	4085	26.389	12423	2.861	9.225
	Bushes	2813	18.172	88635	20.409	0.890
	River	0	0	10049	2.314	0
	Dense forest	171	1.105	1347	0.310	3.562
	Grass land	39	0.252	1357	0.312	0.806
	Shrubs	93	0.601	999	0.230	2.612
	Urban settlement	0	0	1432	0.330	0
Lithology	Quaternary soil	184	1.189	6221	1.432	0.83
	Tertiary lower basalt	7733	49.955	94821	21.834	2.29
	Mesozoic limestone	4011	25.911	129156	29.740	0.87
	Mesozoic gypsum, Mudstone and shale	1170	7.558	140797	32.420	0.23
	Mesozoic lower sandstone	2086	13.475	46758	10.767	1.25
	Paleozoic sandstone	55	0.355	12044	2.773	0.13
	Tertiary upper basalt	241	1.557	4490	1.034	1.51

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