Probabilistic frequency ratio (PFR) model for quality improvement of landslide susceptibility mapping from LiDAR-derived DEMs

Pirasteh, Saied; Li, Jonathan

doi:10.1186/s40677-017-0083-z

Geoenvironmental Disasters

Table 3 Frequency ratio of factors to landslide occurrence

From: Probabilistic frequency ratio (PFR) model for quality improvement of landslide susceptibility mapping from LiDAR-derived DEMs

Factor	Class	Total number of pixel		Landslide occurrence pixel		Frequency ratio
Factor		Number^a	%	Number^b	%	Frequency ratio
Soil	Weathered	85,091	0.84	0	0.00	0.00
	Medium soil form alluvial	804,145	7.94	0	0.00	0.00
	Thin soil over rock	658,226	6.50	15,979	7.80	1.20
	Medium soil over the rock	2,185,002	21.57	80	0.04	0.00
	Medium soil over colluvial	1,746,851	17.24	60,913	29.72	1.72
	Deep soil from alluvial	111,793	10.32	5300	2.59	2.34
	Fine alluvial soils	1,045,712	3.45	45,430	22.17	2.15
	Thin sandy soils	349,206	31.04	1939	0.95	0.27
	Rocks	3,145,180	1.10	75,275	36.73	1.18
Distance from drainage (m)	100	4,424,123	43.67	76,569	37.36	0.86
	200	2,464,779	24.33	59,288	28.93	1.19
	400	2,222,416	21.94	53,917	26.31	1.20
	800	987,245	9.75	15,042	7.34	0.75
	>800	40,237	0.40	100	0.05	0.12
Slope (degree)	0–5	490,045	4.83	3442	1.68	0.35
	5–10	669,427	6.60	12,333	6.02	0.91
	10–20	2,746,384	27.09	67,408	32.89	1.21
	20–30	3,200,304	31.56	67,151	32.77	1.05
	30–40	2,530,305	24.96	47,358	23.11	0.94
	40–50	453,592	4.47	6937	3.38	0.76
	>50	48,743	0.48	310	0.15	0.31
Lithology	TRem	27,679	0.27	785	0.36	1.33
	PEE	536,418	5.30	2	0.00	0.00
	Pn	38,776	0.38	2735	1.27	3.31
	Pr	439,706	4.34	5295	2.45	0.56
	PV	9875	0.10	39	0.02	0.19
	Q	901,467	8.90	10,859	5.02	0.56
	Q1	114,961	1.13	96,880	44.81	39.49
	TR3JS	1,547,999	15.28	654	0.30	0.02
	K1 M2	330,740	3.26	10,652	4.93	1.51
	KM2	511,173	5.05	16,768	7.76	1.54
	KV22	415,791	4.10	12,040	5.57	1.36
	P1Q	277,810	2.74	0	0.00	0.00
	Pd	269,380	2.66	42	0.02	0.01
	TRdc	360,447	3.56	764	0.35	0.10
	CM	804,135	7.94	11,461	5.30	0.67
	O1	20,800	0.21	0	0.00	0.00
Factor	Class	Total number of pixel		Landslide occurrence pixel		Class
Factor	Class	Number^a	%	Number^b	%	Class
Lithology	E1	197,786	1.95	0	0.00	0.00
	Eb	87,995	0.87	1	0.00	0.00
	PEK	1,483,288	14.64	6760	3.13	0.21
	J1	83,479	0.82	147	0.07	0.08
	K1	309,512	3.06	1364	0.63	0.21
	K11	20,444	0.20	3925	1.82	9.00
	K12	697,915	6.89	10,374	4.80	0.70
	kv21	614,502	6.07	13,330	6.17	1.02
	river	25,575	0.25	0	0.00	0.00
	lake	2424	0.02	64	0.03	1.24
Land use	Agriculture land	1,467,497	14.49	78,969	38.53	2.66
	Settlement	407,629	4.02	9869	4.82	1.20
	Open Vegetation	2,914,371	28.77	49,777	24.29	0.84
	Lake	2101	0.02	163	0.08	3.84
	Grass land	1,395,207	13.77	36,045	17.59	1.28
	Dense vegetation	3,385,573	33.42	30,078	14.68	0.44
	Bad land	558,122	5.51	38	0.02	0.00
Distance from road (m)	50	226,534	2.23	15,779	7.70	3.45
	100	223,772	2.21	14,477	7.06	3.20
	200	428,101	4.22	20,930	10.21	2.42
	400	784,725	7.74	30,603	14.93	1.93
	800	1,344,647	13.26	31,178	15.21	1.15
	>800	7,131,021	70.33	91,972	44.88	0.64
Geomorphology	Debris land	255,864	2.53	15,629	7.23	2.86
	Deep valley	670,098	6.61	45,181	20.90	3.16
	Limestone Relief	1,373,183	13.56	3040	1.41	0.10
	Moderate Relief	2,238,436	22.10	58,355	26.99	1.22
	Alluvial Fan	263,711	2.60	0	0.00	0.00
	Alluvial Plain	385,201	3.80	0	0.00	0.00
	Alluvial Terrace	311,277	3.07	10,000	4.63	1.51
	Volcano Relief	4,632,287	45.73	72,711	33.64	0.74

^aTotal number of pixels in the study area: 10,138,800 pixel (Without no data)
^bTotal number of landslide occurrence pixel: 204,939 pixel (Estimation group)

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