基于集成地形校正的长汀县竹林提取与时空变化分析  

Extraction and spatial-temporal change analysis of bamboo forests in Changting County based on integrated terrain correction

作　　者：徐加其 江洪[1,2,3] 林根根 金时来[5] 阮靖怡 于欣 XU Jiaqi;JIANG Hong;LIN Cengen;IN Shilai;RUAN ingyi;YU in(Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education,Fuzhou 350108,China;National&Local Jaint Engineering Research Center of Satellite Geospatial informatiom Technology,Fuzhou 350108,China;Academty of Digital China,Fuzhou University,Fuzhou 350108,China;Soil and Water Conservation Center of Changting County,Changting 366300,China;Fujian Soil and Water Conservation Experiment Station,Fuzhou 350002,China)

机构地区：[1]空间数据挖掘和信息共享教育部重点实验室,福建福州350108 [2]卫星空间信息技术综合应用国家地方联合工程研究中心,福建福州350108 [3]福州大学数字中国研究院(福建),福建福州350108 [4]长汀县水土保持中心,福建长汀366300 [5]福建省水土保持试验站,福建福州350002

出　　处：《海南大学学报(自然科学版)》2024年第4期372-382,共11页Natural Science of Hainan University

基　　金：福建省科技计划引导性项目(2021Y0005,2023N0031);福建省水利科技项目(MSK202301)。

摘　　要：竹林是南方山地丘陵区的重要森林资源,而该区域的地形阴影效应是影响竹林遥感提取精度的重要因素.为消除地形阴影影响,本研究使用新近提出的集成地形校正模型对福建省长汀县2010年和2022年的Landsat影像进行了地形校正,同时运用随机森林方法提取竹林数据,并采用变化幅度与变化率2个指标分析了2010—2022年竹林的时空变化规律,揭示了竹林在高程和坡度上的地形分异效应.结果表明:集成地形校正有效恢复了本影和落影的光谱信息,使得校正后提取的竹林数据在总体分类精度、制图精度与用户精度上超过0.8.2010—2022年长汀县竹林面积变化幅度为34.79%,年均变化幅度为2.89%,呈现出明显的增长趋势.竹林分布具有明显的地形分异效应,主要分布于高程400~700 m,坡度8°~25°范围内.Bamboo forests are one of the important forest resources in the mountainous and hilly areas of southern China,and the terrain shadow effect in this region is a crucial factor affecting the accuracy of bamboo forest remote sensing extraction.To eliminate the influence of terrain shadows,this study employed a recently proposed integrated terrain correction model to perform terrain correction on Landsat images of Changting County,Fujian Province in 2010 and 2022.The random forest method was applied to extract bamboo forests,and two indicators,namely,change magnitude and change rate,were used to analyze the spatiotemporal changes of bamboo forests from 2010 to 2022.Furthermore,the terrain differentiation effects of bamboo forest distribution in terms of elevation and slope were revealed.The results show that the integrated terrain correction effectively restored the spectral information of both the shadow and non-shadow areas,resulting in overall classification accuracy,mapping accuracy,and user accuracy of the extracted bamboo forests exceeding 0.8.The area of bamboo forests in Changting County changed by 34.79%from 2010 to 2022,with an average annual change range of 2.89%,indicating a significant growth trend.The distribution of bamboo forests exhibited clear terrain differentiation effects,primarily occurring in elevations ranging from 400 m to 700 m and slopes ranging from 8°to 25°.

关 键 词：地形校正 竹林 遥感提取 时空变化 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]