基于多样性特征协同技术的飓风前后森林破坏遥感监测
Diversity features collaboration technology for monitoring forests before and after hurricanes by remote sensing
- 2022年26卷第9期 页码：1838-1848
纸质出版日期： 2022-09-07
DOI： 10.11834/jrs.20210230
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摘要
对被飓风破坏的森林进行变化监测与灾害评估是遥感技术的一个重要应用，遥感影像的特征信息提取对森林遥感监测的效果至关重要。多样性特征结合可以有效提高对森林变化的监测精度。然而，当前的空间信息如纹理特征的获取算法依旧保留着传统的固定式计算模式，一直面临着特征数量和邻域参考范围之间难以均衡的问题。为了解决以上问题，本文提出了基于多样性特征协同技术的飓风前后森林破坏遥感监测方法，首先计算出森林遥感影像变化前后的归一化植被指数差值和增强植被指数差值，并提出了基于复合窗口技术的来提取纹理特征，然后建立了多样性特性结合模型；其次提出了一种基于特征分离的旋转森林改进算法，最终，实现了内泽尔森林在暴风前后的高精度变化监测；另外，还测试了新模型在不同训练样本数量下的分类性能。实验结果表明，相对传统的基于光谱特征和单纯的纹理特征的变化监测方法，本文所提出的方法的整体精度、对变化区域和未变化区域的检测精度至多分别提高了3.68%、6.53%和3.46%。本文的研究方法可以有效提高森林变化监测的性能，为森林灾害评估与森林资源保护提供参考依据。
Abstract
Change monitoring and disaster assessment of hurricane-damaged forests are important applications of remote sensing technology. The extraction of feature information from remote sensing images is very important to forest remote sensing monitoring. The combination of diversity features can effectively improve the accuracy of forest change monitoring. However
the current spatial information acquisition algorithms
such as texture features
still retain the traditional fixed computing model and do not fully consider the diversity of the spatial distribution of ground objects. When extracting texture features
the accuracy of texture features is affected when the sliding window is extremely large or small. Therefore
the calculation method of this kind of texture feature is always faced with the problem of hard balance between the number of features and the neighborhood reference range. Therefore
this paper focuses on forest change monitoring technology. To solve the above problems
a remote sensing monitoring method of forest destruction before and after hurricanes are proposed based on diversity features collaborative technology. First
the difference between the normalized vegetation index (NDVI) and the Enhanced Vegetation Index (EVI) before and after forest remote sensing image change is calculated. Second
the compound window technology is proposed to extract the texture features. Then
the texture features extracted from the remote sensing image and the spectrum of the remote sensing image are used to build a diverse characteristic combination model. This model can enhance the diversity of features. Finally
an improved rotating forest algorithm based on feature separation is proposed to reduce the direct feature correlation and improve the accuracy of the classifier. The study area is the remote sensing images of the Nezer forest in France before and after the hurricane
which were obtained from the Formosat-2 satellite. In the experimental part
the classification performance of the proposed algorithm was compared with those of six other methods. Experimental results show that compared with the traditional change detection methods based on spectral and texture features
the overall accuracy of the proposed method
the detection accuracy of the changed area
and the unchanged area improved by 3.68%
6.53% and 3.46%
respectively. In addition
the sensitivity of the features extracted by different methods to the number of training samples was tested. The results show that the proposed method maintains high classification accuracy on different training sample numbers
and its overall accuracy and Kappa coefficient are better than those of the comparison methods. After the number of training samples reaches 50
the accuracy of the proposed method tends to flatten. The proposed method can effectively improve the performance of forest change monitoring. This method can be used to monitor the change of and damage to forests in real time and efficiently obtain information on forest disaster areas
providing important reference data for the emergency decision-making of forest resource management departments. Therefore
this method has a high practical value.
关键词
多样性特征分类旋转森林森林监测植被指数Formosat-2卫星
Keywords
multi featuresclassificationrotation forestforest monitoringvegetation indexFormosat-2 satellite
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中南林业科技大学 林业遥感信息工程研究中心
中南林业科技大学 林业遥感大数据与生态安全湖南省重点实验室
中南林业科技大学 南方森林资源经营与监测国家林业与草原局重点实验室
中国林业科学研究院资源信息研究所
山东科技大学 计算机科学与工程学院
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