基于Sentinel-2时序数据与随机森林的农作物分类研究——以武汉市为例  

Study on Crop Classification Based on Sentinel-2 Time Series Data and Random Forest:A Case Study of Wuhan

作　　者：崔傲雪 王超[2] 徐颖琪 CUI Aoxue;WANG Chao;XU Yingqi(School of Geodesy and Geomatics,Wuhan University,Wuhan 430072,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430072,China;School of Resource and Environmental Sciences,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430072 [2]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430072 [3]武汉大学资源与环境科学学院,湖北武汉430072

出　　处：《测绘与空间地理信息》2024年第12期32-35,44,共5页Geomatics & Spatial Information Technology

基　　金：国家重点研发计划(2018YFB2100603);国家级大学生创新创业训练计划(202110486104)资助。

摘　　要：本研究以湖北省武汉市为研究区域,以PIE-Engine平台上的Sentinel-2遥感影像作为基础数据源,基于3个公开数据集制作样本数据集,构建光谱特征、遥感指数特征和NDVI时序特征集合,选取随机森林分类器,进行2018—2021这4年间武汉市耕地、非耕地二分类和单季稻、双季稻、其他农作物、非耕地四分类的训练与验证。最终统计、对比并分析二分类和四分类的结果,表明:二分类的精度优于四分类,总体精度均高于80%;四分类准确度明显优于二分类,结论均以四分类结果为基础;武汉市的单季稻种植较少,双季稻种植较为广泛;单季稻和双季稻的种植面积均呈现在2019年明显上升,而在2020年明显下降,在2021年又明显上升的变化趋势。This study takes Wuhan city,Hubei province as the research area,takes Sentinel-2 remote sensing images on the PIE-Engine platform as the basic data source,makes sample datasets based on three open datasets,constructs spectral features,remote sensing index features,and NDVI time series feature sets,and selects random forest classifiers to carry out the training and verification of two-category classification of cropland and noncropland and four-category classification of single cropping rice,double cropping rice,other crops and noncropland in Wuhan from 2018 to 2021.The final statistics,comparison and analysis of the results of the two-category classification and the four-category classification show that the accuracy of the two-category classification is better than the four-category classification,and the overall accuracy is higher than 80%;the correctness of four-category classification is obviously better than that of two-category classification,and the conclusion is based on the results of four-category classification;in Wuhan,single cropping rice is less planted,and double cropping rice is widely planted;the planting area of both single cropping rice and double cropping rice first increased significantly in 2019,then decreased significantly in 2020,and then increased significantly in 2021.

关 键 词：武汉市 样本数据集 Sentinel-2 NDVI时序特征 随机森林 

分 类 号：P237[天文地球—摄影测量与遥感]