Mapping Winter Wheat with Optical and SAR Images Based on Google Earth Engine in Henan Province, China

文献类型： 外文期刊

第一作者： Li, Changchun

作者： Li, Changchun;Chen, Weinan;Wang, Yilin;Wang, Yu;Ma, Chunyan;Li, Yacong;Li, Jingbo;Zhai, Weiguang;Li, Jingbo

作者机构：

关键词： winter wheat; Sentinel; Google Earth Engine; image aggregation; integrated image; random forest

期刊名称：REMOTE SENSING （ 影响因子：5.349； 五年影响因子：5.786 ）

ISSN：

年卷期： 2022 年 14 卷 2 期

页码：

收录情况： SCI

摘要： The timely and accurate acquisition of winter wheat acreage is crucial for food security. This study investigated the feasibility of extracting the spatial distribution map of winter wheat in Henan Province by using synthetic aperture radar (SAR, Sentinel-1A) and optical (Sentinel-2) images. Firstly, the SAR images were aggregated based on the growth period of winter wheat, and the optical images were aggregated based on the moderate resolution imaging spectroradiometer normalized difference vegetation index (MODIS-NDVI) curve. Then, five spectral features, two polarization features, and four texture features were selected as feature variables. Finally, the Google Earth Engine (GEE) cloud platform was employed to extract winter wheat acreage through the random forest (RF) algorithm. The results show that: (1) aggregated images based on the growth period of winter wheat and sensor characteristics can improve the mapping accuracy and efficiency; (2) the extraction accuracy of using only SAR images was improved with the accumulation of growth period. The extraction accuracy of using the SAR images in the full growth period reached 80.1%; and (3) the identification effect of integrated images was relatively good, which makes up for the shortcomings of SAR and optical images and improves the extraction accuracy of winter wheat.

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