Satellite-based emergency mapping using optical imagery: experience and reflections from the 2015 Nepal earthquakes

Williams, Jack G.; Rosser, Nick J.; Kincey, Mark E.; Benjamin, Jessica; Oven, Katie J.; Densmore, Alexander L.; Milledge, David G.; Robinson, Tom R.; Jordan, Colm A.; Dijkstra, Tom A.

doi:10.5194/nhess-18-185-2018

Articles | Volume 18, issue 1

https://doi.org/10.5194/nhess-18-185-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-18-185-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 1

Research article

|

16 Jan 2018

Research article |

| 16 Jan 2018

Satellite-based emergency mapping using optical imagery: experience and reflections from the 2015 Nepal earthquakes

Jack G. Williams, Nick J. Rosser, Mark E. Kincey, Jessica Benjamin, Katie J. Oven, Alexander L. Densmore, David G. Milledge, Tom R. Robinson, Colm A. Jordan, and Tom A. Dijkstra

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Total article views: 6,350 (including HTML, PDF, and XML)

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3,755	2,417	178	6,350	449	168	195

HTML: 3,755
PDF: 2,417
XML: 178
Total: 6,350
Supplement: 449
BibTeX: 168
EndNote: 195

Views and downloads (calculated since 31 Jul 2017)

Month	HTML	PDF	XML	Total
Jul 2017	35	8	0	43
Aug 2017	219	66	1	286
Sep 2017	108	29	0	137
Oct 2017	23	20	0	43
Nov 2017	24	17	0	41
Dec 2017	12	9	1	22
Jan 2018	220	89	12	321
Feb 2018	108	44	8	160
Mar 2018	74	42	8	124
Apr 2018	26	38	2	66
May 2018	32	21	3	56
Jun 2018	29	21	3	53
Jul 2018	22	16	3	41
Aug 2018	37	15	3	55
Sep 2018	19	39	2	60
Oct 2018	32	25	2	59
Nov 2018	25	21	2	48
Dec 2018	14	15	1	30
Jan 2019	18	25	0	43
Feb 2019	22	23	1	46
Mar 2019	13	17	2	32
Apr 2019	16	18	0	34
May 2019	15	13	0	28
Jun 2019	31	19	2	52
Jul 2019	14	17	3	34
Aug 2019	21	17	1	39
Sep 2019	18	15	0	33
Oct 2019	31	23	0	54
Nov 2019	15	9	3	27
Dec 2019	20	12	0	32
Jan 2020	21	15	3	39
Feb 2020	22	8	2	32
Mar 2020	10	13	0	23
Apr 2020	12	11	1	24
May 2020	19	17	0	36
Jun 2020	26	20	3	49
Jul 2020	27	29	8	64
Aug 2020	15	15	4	34
Sep 2020	14	15	1	30
Oct 2020	9	19	0	28
Nov 2020	18	11	1	30
Dec 2020	14	16	0	30
Jan 2021	24	17	0	41
Feb 2021	22	16	1	39
Mar 2021	29	12	0	41
Apr 2021	28	12	1	41
May 2021	19	12	0	31
Jun 2021	24	22	3	49
Jul 2021	34	27	0	61
Aug 2021	29	26	1	56
Sep 2021	22	21	0	43
Oct 2021	28	40	0	68
Nov 2021	22	41	0	63
Dec 2021	30	20	0	50
Jan 2022	33	18	0	51
Feb 2022	33	11	1	45
Mar 2022	35	17	1	53
Apr 2022	37	17	6	60
May 2022	37	31	0	68
Jun 2022	28	14	3	45
Jul 2022	26	6	1	33
Aug 2022	40	27	2	69
Sep 2022	30	17	0	47
Oct 2022	39	13	2	54
Nov 2022	50	25	0	75
Dec 2022	65	18	0	83
Jan 2023	68	40	2	110
Feb 2023	72	18	0	90
Mar 2023	86	52	1	139
Apr 2023	34	25	3	62
May 2023	28	25	6	59
Jun 2023	26	27	1	54
Jul 2023	32	20	1	53
Aug 2023	29	18	3	50
Sep 2023	26	36	0	62
Oct 2023	49	31	1	81
Nov 2023	36	18	3	57
Dec 2023	32	35	2	69
Jan 2024	35	33	3	71
Feb 2024	35	38	4	77
Mar 2024	39	43	2	84
Apr 2024	56	28	2	86
May 2024	69	56	2	127
Jun 2024	33	30	1	64
Jul 2024	36	24	6	66
Aug 2024	51	16	3	70
Sep 2024	28	19	1	48
Oct 2024	39	24	2	65
Nov 2024	40	30	3	73
Dec 2024	31	30	1	62
Jan 2025	46	21	2	69
Feb 2025	54	16	1	71
Mar 2025	37	33	3	73
Apr 2025	48	38	0	86
May 2025	52	19	0	71
Jun 2025	60	25	1	86
Jul 2025	40	26	2	68
Aug 2025	32	30	2	64
Sep 2025	53	25	4	82
Oct 2025	44	42	2	88
Nov 2025	15	14	0	29

Cumulative views and downloads (calculated since 31 Jul 2017)

Month	HTML	PDF	XML	Total
Jul 2017	35	8	0	43
Aug 2017	219	66	1	286
Sep 2017	108	29	0	137
Oct 2017	23	20	0	43
Nov 2017	24	17	0	41
Dec 2017	12	9	1	22
Jan 2018	220	89	12	321
Feb 2018	108	44	8	160
Mar 2018	74	42	8	124
Apr 2018	26	38	2	66
May 2018	32	21	3	56
Jun 2018	29	21	3	53
Jul 2018	22	16	3	41
Aug 2018	37	15	3	55
Sep 2018	19	39	2	60
Oct 2018	32	25	2	59
Nov 2018	25	21	2	48
Dec 2018	14	15	1	30
Jan 2019	18	25	0	43
Feb 2019	22	23	1	46
Mar 2019	13	17	2	32
Apr 2019	16	18	0	34
May 2019	15	13	0	28
Jun 2019	31	19	2	52
Jul 2019	14	17	3	34
Aug 2019	21	17	1	39
Sep 2019	18	15	0	33
Oct 2019	31	23	0	54
Nov 2019	15	9	3	27
Dec 2019	20	12	0	32
Jan 2020	21	15	3	39
Feb 2020	22	8	2	32
Mar 2020	10	13	0	23
Apr 2020	12	11	1	24
May 2020	19	17	0	36
Jun 2020	26	20	3	49
Jul 2020	27	29	8	64
Aug 2020	15	15	4	34
Sep 2020	14	15	1	30
Oct 2020	9	19	0	28
Nov 2020	18	11	1	30
Dec 2020	14	16	0	30
Jan 2021	24	17	0	41
Feb 2021	22	16	1	39
Mar 2021	29	12	0	41
Apr 2021	28	12	1	41
May 2021	19	12	0	31
Jun 2021	24	22	3	49
Jul 2021	34	27	0	61
Aug 2021	29	26	1	56
Sep 2021	22	21	0	43
Oct 2021	28	40	0	68
Nov 2021	22	41	0	63
Dec 2021	30	20	0	50
Jan 2022	33	18	0	51
Feb 2022	33	11	1	45
Mar 2022	35	17	1	53
Apr 2022	37	17	6	60
May 2022	37	31	0	68
Jun 2022	28	14	3	45
Jul 2022	26	6	1	33
Aug 2022	40	27	2	69
Sep 2022	30	17	0	47
Oct 2022	39	13	2	54
Nov 2022	50	25	0	75
Dec 2022	65	18	0	83
Jan 2023	68	40	2	110
Feb 2023	72	18	0	90
Mar 2023	86	52	1	139
Apr 2023	34	25	3	62
May 2023	28	25	6	59
Jun 2023	26	27	1	54
Jul 2023	32	20	1	53
Aug 2023	29	18	3	50
Sep 2023	26	36	0	62
Oct 2023	49	31	1	81
Nov 2023	36	18	3	57
Dec 2023	32	35	2	69
Jan 2024	35	33	3	71
Feb 2024	35	38	4	77
Mar 2024	39	43	2	84
Apr 2024	56	28	2	86
May 2024	69	56	2	127
Jun 2024	33	30	1	64
Jul 2024	36	24	6	66
Aug 2024	51	16	3	70
Sep 2024	28	19	1	48
Oct 2024	39	24	2	65
Nov 2024	40	30	3	73
Dec 2024	31	30	1	62
Jan 2025	46	21	2	69
Feb 2025	54	16	1	71
Mar 2025	37	33	3	73
Apr 2025	48	38	0	86
May 2025	52	19	0	71
Jun 2025	60	25	1	86
Jul 2025	40	26	2	68
Aug 2025	32	30	2	64
Sep 2025	53	25	4	82
Oct 2025	44	42	2	88
Nov 2025	15	14	0	29

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Short summary

There is currently no protocol for rapid humanitarian-facing landslide assessment and no published recognition of what is possible and useful to compile immediately after a triggering event. Drawing on the 2015 Gorkha earthquake (Nepal), we consider how quickly a landslide assessment based upon manual satellite-based emergency mapping (SEM) can be realistically achieved and review the decisions taken by analysts to ascertain the timeliness and type of useful information that can be generated.


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