高分六号红边波段对夏玉米种植区识别的影响

Effect of GF-6 red-edge bands on identification of summer maize planting area

为探究高分六号卫星新增红边波段对夏玉米种植区识别的影响,选取山东省兰陵县为研究区,基于多时相高分六号宽幅相机遥感影像,构建4种波段组合方案,结合地面数据分析不同方案样本类型可分离性,采用支持向量机方法,提取研究区不同前茬作物夏玉米种植区域,分析光谱反射率变化及识别结果精度。结果表明:高分六号卫星两个红边波段都能不同程度提高不同物候期夏玉米与其他作物的区分度,较无红边波段参与相比,红边波段参与下不同作物间可分离度有一定提高;大蒜收获后、冬小麦收获后播种的夏玉米总体分类精度分别由80.1%、77.3%提高到90.3%、91.1%,分别提升10.2%和13.8%,Kappa系数分别由0.60、0.56提高至0.80、0.81。研究表明,新增红边波段可以有效提高夏玉米识别和提取精度,能够为红边波段的农业应用提供参考。

In order to explore the effect of the newly added red-edge bands of GF-6 satellite on the identification of summer maize planting area,Lanling county of Shandong province is taken as the study area.Based on the multi-temporal GF-6 wide field view(WFV)remote sensing images,4 band combination schemes are constructed,and the separability of sample types of different schemes is analyzed combined with the ground data.The support vector machine(SVM)method is used to extract the summer maize planting areas of different previous crops in the study area,and the spectral reflectance changes and identification accuracy are analyzed.The results are shown below.The two red-edge bands of GF-6 can improve the degree of differentiation between summer maize and other crops in different phenological periods;compared with the absence of red-edge bands,the degree of differentiation between different crops improves with the participation of red-edge bands.The overall classification accuracy of summer maize sown after garlic and winter wheat increases from 80.1%to 90.3%and from 77.3%to 91.1%,i.e.,increases by 10.2%and 13.8%,respectively;Kappa coefficient increases from 0.60 to 0.80 and from 0.56 to 0.81,respectively.The classification results show that the newly added red-edge bands can significantly improve the accuracy of summer maize’s identification and extraction,and provide reference for the agricultural application of red-edge bands.