Dynamic Monitoring of Spartina alterniflora in Xiangshan Harbor Based on GEE and Random Forest

doi:10.13466/j.cnki.lyzygl.2023.03.006

Abstract

Abstract:

The large-scale invasion of Spartina alterniflora has endangered the ecological security of China's coastal area.Therefore,studying a fast and accurate algorithm for identifying Spartina alterniflora is particularly important for achieving dynamic monitoring within the region.Taking Xiangshan harbor as a research zone in this study,151 Spartina alterniflora and 140 non-Spartina alterniflora land patches were used as the training data set on the GEE platform.The index of NDVI,EVI,NDWI and BSI were extracted from the Sentinel-2 remote sensing image band information,and these indices were added to the remote sensing image data.Machine learning methods such as Support Vector Machines and Random Forests were used for identification and classification.By identifying and classifying Sentinel-2 remote sensing images from 2017 to 2022,dynamic monitoring of Spartina alterniflora within the study area was achieved.The research results showed that compared with SVM,the RF method had higher recognition accuracy for identifying Spartina alterniflora,and the overall recognition accuracy in 2022 reached 99.03% with a Kappa coefficient of 0.978 7.At the same time,the experimental results showed that the area of Spartina alterniflora in Xiangshan harbor has gradually decreased since 2017,indicating that the artificial intervention measures taken during this period were very effective.The dynamic monitoring and status analysis of Spartina alterniflora in Xiangshan harbor provided quantitative scientific data for the management of Spartina alterniflora,and have important reference value for formulating relevant prevention and control measures.

Key words: Spartina alterniflora, Google Earth Engine, support vector machines, random forests, remote sensing image

CLC Number:

LIANG Licheng, FU Xiaoqiang, ZHANG Bin, CHENG Guxun, LI Zuohui. Dynamic Monitoring of Spartina alterniflora in Xiangshan Harbor Based on GEE and Random Forest[J]. FOREST RESOURCES WANAGEMENT, 2023, (3): 38-45.

Figures/Tables 9

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References 14

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Sentinel-2 波段	波长/μm	分辨率/m
Band 1:coastal aerosol	0.443	60
Band 2:blue	0.490	10
Band 3:green	0.560	10
Band 4:red	0.665	10
Band 5:vegetation red edge	0.705	20
Band 6:vegetation red edge	0.740	20
Band 7:vegetation red edge	0.783	20
Band 8:NIR	0.842	10
Band 8A:vegetation red edge	0.865	20
Band 9:water vapor	0.945	60
Band 10:SWIR-cirrus	1.375	60
Band 11:SWIR	1.610	20
Band 12:SWIR	2.190	20

Landsat-8 波段	波长/μm	分辨率/m
Band 1:Coastal aerosol	0.43~0.45	30
Band 2:Blue	0.45~0.51	30
Band 3:Green	0.53~0.59	30
Band 4:Red	0.64~0.67	30
Band 5:Near infrared	0.85~0.88	30
Band 6:Shortwave infrared 1	1.57~1.65	30
Band 7:Shortwave infrared 1	2.11~2.29	30
Band 8:Panchromatic	0.52~0.90	15
Band 9:Cirrus	1.36~1.38	15
Band 10:Thermal infrared 1	10.60~11.19	30
Band 11:Thermal infrared 2	11.50~12.51	30
BQA:Landsat Collection 1 QA Bitmask		30

年份	RF算法		SVM算法
年份	OA/%	Kappa系数	OA/%	Kappa系数
2017	98.94	0.976 7	96.86	0.930 9
2018	98.82	0.974 1	97.00	0.934 6
2019	99.26	0.983 6	98.17	0.959 8
2020	99.22	0.982 8	97.38	0.942 3
2021	99.13	0.980 8	97.37	0.942 0
2022	99.03	0.978 7	97.25	0.939 7

年份	分类	互花米草	非互花米草
2017	互花米草	3 798	8
2017	非互花米草	109	7123
2018	互花米草	3 802	4
2018	非互花米草	126	7 106
2019	互花米草	3 794	12
2019	非互花米草	70	7 162
2020	互花米草	3 800	6
2020	非互花米草	80	7 152
2021	互花米草	3 795	11
2021	非互花米草	85	7 147
2022	互花米草	3 799	7
2022	非互花米草	100	7 132

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