Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data

Time series of vegetation indices can be utilized to capture crop phenology information, and have been widely used in land cover and crop classification, phenological feature extraction, and planting structure monitoring. This is of great significance for guiding agricultural production and formulat...

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Autores principales:	Yupeng Kang, Xinli Hu, Qingyan Meng, Youfeng Zou, Linlin Zhang, Miao Liu, Maofan Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	GF-6 WFV data time series red edge indices feature selection crop classification Science Q
Acceso en línea:	https://doaj.org/article/32ac0981877b4ede9a93983bc4b5ff47
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spelling	oai:doaj.org-article:32ac0981877b4ede9a93983bc4b5ff472021-11-25T18:53:53ZLand Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data10.3390/rs132245222072-4292https://doaj.org/article/32ac0981877b4ede9a93983bc4b5ff472021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4522https://doaj.org/toc/2072-4292Time series of vegetation indices can be utilized to capture crop phenology information, and have been widely used in land cover and crop classification, phenological feature extraction, and planting structure monitoring. This is of great significance for guiding agricultural production and formulating agricultural policies. According to the characteristics of the GF-6 satellite’s newly-added red edge bands, wide field view and high-frequency imaging, the time series of vegetation indices about multi-temporal GF-6 WFV data are used for the study of land cover and crop classification. In this study, eight time steps of GF-6 WFV data were selected from March to October 2019 in Hengshui City. The normalized difference vegetation index (NDVI) time series and 10 different red edge spectral indices time series were constructed. Then, based on principal component analysis (PCA), using two feature selection and evaluation methods, stepwise discriminant analysis (SDA) and random forest (RF), the red edge vegetation index of normalized difference red edge (NDRE) was selected. Seven different lengths of NDVI, NDRE and NDVI&NDRE time series were reconstructed by the Savizky-Golay (S-G) smoothing algorithm. Finally, an RF classification algorithm was used to analyze the influence of time series length and red edge indices features on land cover and crop classification, and the planting structure and distribution of crops in the study area were obtained. The results show that: (1) Compared with the NDRE red edge time series, the NDVI time series is more conducive to the improvement of the overall classification accuracy of crops, and NDRE can assist NDVI in improving the crop classification accuracy; (2) With the shortening of NDVI and NDRE time series, the accuracy of crop classification is gradually decreased, and the decline is gradually accelerated; and (3) Through the combination of the NDVI and NDRE time series, the accuracy of crop classification with different time series lengths can be improved compared with the single NDVI time series, which is conducive to improving the classification accuracy and timeliness of crops. This study has fully tapped the application potential of the new red edge bands of GF-6 WFV time series data, which can provide references for crop identification and classification of time series data such as NDVI and red edge vegetation index of different lengths. At the same time, it promotes the application of optical satellite data with red edge bands in the field of agricultural remote sensing.Yupeng KangXinli HuQingyan MengYoufeng ZouLinlin ZhangMiao LiuMaofan ZhaoMDPI AGarticleGF-6 WFV datatime seriesred edge indicesfeature selectioncrop classificationScienceQENRemote Sensing, Vol 13, Iss 4522, p 4522 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	GF-6 WFV data time series red edge indices feature selection crop classification Science Q
spellingShingle	GF-6 WFV data time series red edge indices feature selection crop classification Science Q Yupeng Kang Xinli Hu Qingyan Meng Youfeng Zou Linlin Zhang Miao Liu Maofan Zhao Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
description	Time series of vegetation indices can be utilized to capture crop phenology information, and have been widely used in land cover and crop classification, phenological feature extraction, and planting structure monitoring. This is of great significance for guiding agricultural production and formulating agricultural policies. According to the characteristics of the GF-6 satellite’s newly-added red edge bands, wide field view and high-frequency imaging, the time series of vegetation indices about multi-temporal GF-6 WFV data are used for the study of land cover and crop classification. In this study, eight time steps of GF-6 WFV data were selected from March to October 2019 in Hengshui City. The normalized difference vegetation index (NDVI) time series and 10 different red edge spectral indices time series were constructed. Then, based on principal component analysis (PCA), using two feature selection and evaluation methods, stepwise discriminant analysis (SDA) and random forest (RF), the red edge vegetation index of normalized difference red edge (NDRE) was selected. Seven different lengths of NDVI, NDRE and NDVI&NDRE time series were reconstructed by the Savizky-Golay (S-G) smoothing algorithm. Finally, an RF classification algorithm was used to analyze the influence of time series length and red edge indices features on land cover and crop classification, and the planting structure and distribution of crops in the study area were obtained. The results show that: (1) Compared with the NDRE red edge time series, the NDVI time series is more conducive to the improvement of the overall classification accuracy of crops, and NDRE can assist NDVI in improving the crop classification accuracy; (2) With the shortening of NDVI and NDRE time series, the accuracy of crop classification is gradually decreased, and the decline is gradually accelerated; and (3) Through the combination of the NDVI and NDRE time series, the accuracy of crop classification with different time series lengths can be improved compared with the single NDVI time series, which is conducive to improving the classification accuracy and timeliness of crops. This study has fully tapped the application potential of the new red edge bands of GF-6 WFV time series data, which can provide references for crop identification and classification of time series data such as NDVI and red edge vegetation index of different lengths. At the same time, it promotes the application of optical satellite data with red edge bands in the field of agricultural remote sensing.
format	article
author	Yupeng Kang Xinli Hu Qingyan Meng Youfeng Zou Linlin Zhang Miao Liu Maofan Zhao
author_facet	Yupeng Kang Xinli Hu Qingyan Meng Youfeng Zou Linlin Zhang Miao Liu Maofan Zhao
author_sort	Yupeng Kang
title	Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
title_short	Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
title_full	Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
title_fullStr	Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
title_full_unstemmed	Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data
title_sort	land cover and crop classification based on red edge indices features of gf-6 wfv time series data
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/32ac0981877b4ede9a93983bc4b5ff47
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_version_	1718410577934548992

Land Cover and Crop Classification Based on Red Edge Indices Features of GF-6 WFV Time Series Data

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