GF-7卫星多角度特征作物识别
Crop recognition by multiangle features of GF-7 satellite
- 2023年27卷第9期 页码：2127-2138
纸质出版日期： 2023-09-07
DOI： 10.11834/jrs.20221644
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摘要
多角度遥感对地观测能够提供更加丰富、多方向的遥感特征，提高地类之间的可区分性，为地物覆盖的精确识别打下坚实的数据基础。GF-7是中国继ZY-3卫星后的首颗亚米级测绘卫星，这为利用多角度特性解决“异物同谱”的问题，提高作物的识别精度带来了机遇。本文利用GF-7前视、后视全色及后视多光谱数据，各种特征组合输入到支撑向量机分类器进行分类，相对于光谱、纹理等特征，分析多角度特征对作物识别精度的作用。结果表明，较仅应用光谱特征，光谱与角差特征组合使用大蒜和冬小麦的制图精度分别提高了4.07%和3.15%，用户精度分别提高了6.73%和2.12%；较应用光谱与纹理特征，光谱、纹理与角差特征组合使用大蒜和冬小麦的制图精度分别提高了3.14%和1.01%，用户精度分别提高了5.11%和0.67%。通过McNemar检验分析，这种分类精度的提高是稳定的，角差特征使用能有效提高作物的识别精度。究其原因，多角度特征对不同作物类型在多角度观测时的光谱响应具备特有的差异性，这种差异提高了作物之间的可分性，从而保证作物遥感识别的精度。
Abstract
Multiangle remote sensing can provide richer
multidirectional features for ground object observation
improve the distinguishability between land types
and lay a solid data foundation for the accurate identification of ground cover. GF-7 is the first domestic sub meter surveying and mapping satellite after ZY-3 satellite
which brings an opportunity to solve the problem of “foreign matter homospectrum” using multiangle characteristics and to improve the identification accuracy of crops. In this paper
GF-7 forward-looking and backward-looking panchromatic and backward-looking multispectral data are used
and various features combinations are input to the support vector machine classifier to analyze the influence of multiangle features on crop recognition accuracy relative to the spectral and texture features. Results show that compared with only spectral features
with the addition of the angle difference feature
the production accuracy of garlic and winter wheat increased by 4.07% and 3.15%
respectively
and the user accuracy increased by 6.73% and 2.12%
respectively. Compared with the combination of spectral and texture features
with the addition of the angle difference feature
the production accuracy of garlic and winter wheat increased by 3.14% and 1.01%
respectively
and the user accuracy increased by 5.11% and 0.67%
respectively. Through the analysis of McNemar test
the improvement of classification accuracy is stable
angle difference feature can effectively improve the identification accuracy of crops. Tracing it to its cause
the multiangle characteristics of GF-7 satellite have unique differences in the spectral response of different crop types during multiangle observation. The difference improves the separability between crops to ensure the accuracy of crop remote sensing mapping.
关键词
GF-7支撑向量机角差遥感冬小麦大蒜农业
Keywords
GF-7SVMangle differenceremote sensingwinter wheatgarlicagriculture
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中国科学院空天信息创新研究院 遥感卫星应用国家工程实验室
中国科学院大学
中国农业科学院 农业资源与农业区划研究所
农业部农业遥感重点实验室
中国农业科学院农业环境与可持续发展研究所
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