Method for Monitoring Daily Snow Cover based on Dynamic NDSI Thresholds

Yuyan SUN; Lei ZHANG; Shanlong LU; Hongchao LIU

doi:10.12082/dqxxkx.2020.190139

Journals >Journal of Geo-information Science >Volume 22 >Issue 2 >Page 298 > Article

Journal of Geo-information Science
Vol. 22, Issue 2, 298 (2020)

Method for Monitoring Daily Snow Cover based on Dynamic NDSI Thresholds

Yuyan SUN^{1、1、2、2}, Lei ZHANG^1、1、*, Shanlong LU^1、1, and Hongchao LIU^{1、1、2、2}

Author Affiliations

¹Key Laboratory of Digital Earth, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

¹中国科学院空天信息创新研究院数字地球重点实验室,北京 100094

²School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

²中国科学院大学电子电气与通信工程学院,北京 100049

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DOI: 10.12082/dqxxkx.2020.190139 Cite this Article

Yuyan SUN, Lei ZHANG, Shanlong LU, Hongchao LIU. Method for Monitoring Daily Snow Cover based on Dynamic NDSI Thresholds[J]. Journal of Geo-information Science, 2020, 22(2): 298 Copy Citation Text

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Fig. 1. Location and elevation of the Sanjiangyuan eco- environmental protection zone

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Fig. 2. Flowchart for snow monitoring by dynamic NDSI thresholds

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Fig. 3. Regression analysis between MODIS NDSI thresholds and average NDSI of pure permanent snow

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Fig. 4. Spatial differences of monitoring results by different monitoring methods based on the two-period data

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编号	成像日期	行列号	编号	成像日期	行列号
01	2013-11-04	139036	02	2013-11-06	137035
03	2013-11-15	136035	04	2013-11-22	137036
05	2013-11-29	138036	06	2013-12-01	136037
07	2013-12-03	134036	08	2013-12-08	137035
09	2013-12-28	133036	10	2014-10-31	138036
11	2014-11-09	137035	12	2014-11-13	133036
13	2014-11-16	138035	14	2014-12-02	138035
15	2014-12-29	135037	16	2014-12-31	133036
17	2015-01-09	132036	18	2015-02-06	136037
19	2015-01-21	136037	20	2015-03-21	133036
21	2015-04-22	133035	22	2015-11-16	133036
23	2015-11-28	137036	24	2016-01-08	136036
25	2016-01-17	135037	26	2016-02-04	133036
27	2016-10-17	133036	28	2016-10-22	136037
29	2016-10-31	135037	30	2016-12-04	133037
31	2017-01-01	137036	32	2017-01-05	133036
33	2017-02-04	135037	34	2017-04-30	138036
35	2017-10-27	134036	36	2017-11-01	137036
37	2017-11-05	133036	38	2017-11-08	138036
39	2017-11-12	134036	40	2017-11-19	135036
41	2017-12-30	134035	42	2018-01-01	132036
43	2018-03-29	133036	44	2018-11-07	133037
45	2018-11-21	135037	46	2018-11-23	133036
47	2018-12-25	133036	48	2018-11-30	134036
49	2018-12-16	134035	50	2019-01-01	134036

Table 1. Landsat8-OLI images used for this study

时间	精度指标	监测方法		动态比固定NDSI阈值提高精度
时间	精度指标	动态NDSI阈值	固定NDSI阈值0.33	动态比固定NDSI阈值提高精度
2013-11-04	近似率	97.58	82.45	15.13
	总体分类精度	94.59	93.71	0.88
	F值	87.05	83.30	3.75
2013-11-22	近似率	85.79	71.42	14.37
	总体分类精度	90.95	88.33	2.62
	F值	79.23	74.18	5.05
2013-12-03	近似率	96.66	93.94	2.72
	总体分类精度	92.07	91.75	0.32
	F值	87.85	87.55	0.30
2014-12-02	近似率	97.42	97.42	0.00
	总体分类精度	95.85	95.85	0.00
	F值	92.57	92.57	0.00
2015-11-16	近似率	98.01	94.64	3.37
	总体分类精度	95.10	94.63	0.47
	F值	96.58	96.32	0.26
2016-10-31	近似率	98.68	94.35	4.33
	总体分类精度	98.83	98.15	0.68
	F值	99.31	98.90	0.41
2017-10-27	近似率	94.59	92.55	2.04
	总体分类精度	93.58	93.12	0.46
	F值	93.23	92.67	0.56
2017-11-01	近似率	99.35	92.31	7.04
	总体分类精度	92.30	91.85	0.45
	F值	89.33	89.00	0.33
2017-11-12	近似率	98.56	97.98	0.58
	总体分类精度	96.84	96.70	0.14
	F值	96.93	96.80	0.13
2018-11-23	近似率	99.49	97.34	2.15
	总体分类精度	96.13	95.15	0.98
	F值	97.84	97.25	0.59

Table 2. Monitoring accuracies based on dynamic NDSI thresholds versus the fixed NDSI threshold 0.33 （%）

Yuyan SUN, Lei ZHANG, Shanlong LU, Hongchao LIU. Method for Monitoring Daily Snow Cover based on Dynamic NDSI Thresholds[J]. Journal of Geo-information Science, 2020, 22(2): 298

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