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Remote Sensing for Land & Resources    2018, Vol. 30 Issue (4) : 108-114     DOI: 10.6046/gtzyyg.2018.04.17
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Using Sentinel-1 multi-temporal InSAR data to monitor the damage degree of shoot beetle in Yunnan pine forest
Juan XUE1, Linfeng YU1, Qinan LIN1, Guang LIU2, Huaguo HUANG1()
1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China
2. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China
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Abstract  

Forest pests constitute one of the important threats to the healthy growth of forests, and the monitoring of its damage is of great significance to forest protection. In this paper, a method of monitoring the degree of forest pests by using interferometric synthetic aperture Radar (InSAR) is proposed. Xiangyun County of Yunnan Province was selected as the study area and the multi-temporal C-band Sentinel-1 images were applied. Based on the information of Radar backscattering intensity, interference phase and coherence coefficient, the time-varying characteristics of coherence coefficient and backscattering coefficient were analyzed by combining the phenological phase of Yunnan pine and relative humidity in the height of 2 meters. Fusion of multi-temporal data was applied to the classification of health forest and different degrees of damaged forest. Some conclusions have been reached: ① The temporal variation of the backscattering coefficient and the coherence coefficient are related to the phenological phenology of Yunnan pine. ② The correlation between the relative humidity and backscattering coefficient is higher than coherence coefficient, which reaches 0.78 in the mildly damaged forest. ③ Field data validation shows that classification accuracy of the multi-temporal coherence coefficient is higher than the backscattering coefficient, and the descending image has the highest precision which reaches 83.15%. The result shows that the coherence coefficient of C-band SAR time series can effectively identify the problem as to whether the forest is healthy or suffers different degrees of damage. ④ The method has certain advantages in monitoring and classification of forest pests in cloudy areas as well as in further enhancing the capability of remote sensing on monitoring pests.
Keywords multi-temporal InSAR      Yunnan pine forest      pests      classification     
:  TP79  
Corresponding Authors: Huaguo HUANG     E-mail: huaguo_huang@bjfu.edu.cn
Issue Date: 07 December 2018
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Juan XUE
Linfeng YU
Qinan LIN
Guang LIU
Huaguo HUANG
Cite this article:   
Juan XUE,Linfeng YU,Qinan LIN, et al. Using Sentinel-1 multi-temporal InSAR data to monitor the damage degree of shoot beetle in Yunnan pine forest[J]. Remote Sensing for Land & Resources, 2018, 30(4): 108-114.
URL:  
https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.04.17     OR     https://www.gtzyyg.com/EN/Y2018/V30/I4/108
Fig.1  Geographic location of study area
Fig.2  Intensity and interference image processing results on the May 16th—June 9th, 2015
Fig.3  Variance analysis of single scene image
Fig.4  Time series analysis of SAR parameters
时间 云南松物候期 特点
3月上旬 顶芽萌发期 树液流动,顶芽萌发
4—5月 抽梢期 新梢生长,针叶抽长变绿
7月 针叶生长盛期 枝梢高生长缓慢
9月 营养生长期 高生长、粗生长缓慢
11月—次年2月 休眠期 树液停止流动,生长停止
Tab.1  Phenophase and growth characteristics of Yunnan pine
Fig.5  Correlation analysis between relative humidity and SAR parameters
Fig.6  Classification results
分类方法 健康
林/%		 轻度受
害林/%		 重度受
害林/%		 总精
度/%		 Kappa
系数
相干
系数		 升轨 92.59 26.92 91.67 73.03 0.579 4
降轨 100 42.31 100 83.15 0.739 9
后向散
射系数		 升轨 100 26.92 80.65 70.79 0.556 5
降轨 5.88 55.56 47.22 57.30 0.353 3
Tab.2  Accuracy validation of classification results
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