北京测绘2025，Vol.39Issue(6)：867-872,6.DOI:10.19580/j.cnki.1007-3000.2025.06.019
基于随机森林的汶川县土地覆盖遥感监测与生态系统功能变化分析
Remote sensing monitoring of land cover and ecosystem function change analysis in Wenchuan County based on random forest
摘要
Abstract
Wenchuan County is located in the typical mountainous environment of Minjiang River Basin in Northwest Sichuan and has experienced the destruction and reconstruction process of the 5.12 earthquake in the past two decades,and the land cover and local ecosystem functions in the county have been evolving under the influence of planning and construction.Based on the 12-view land satellite 8 operational land imager-thermal infrared sensor(Landsat-8 OLI_TIRS)remote sensing images acquired in 2000,2010,and 2020,this paper utilized the random forest model for machine learning training and land cover classification and then integrated the landscape transfer matrix,buffer analysis,and land cover orientation model to analyze the land cover and ecosystem function evolutions of Wenchuan County between 2000 and 2020 through quantitative comparison and attribution analysis.The results show that the land cover of Wenchuan County in the past two decades generally features the degradation of grassland and forest land and the expansion of farmland and building land,and the final area of building land has increased by 2.1 times after first degradation and then expansion;the final area of farmland has expanded by 6.5%after first expansion and then degradation.Under the influence of local topographic and geomorphic patterns,farmland and residential changes mainly occur along rivers.Along with the spatio-temporal changes in land cover,the comprehensive function of local ecosystems gradually rebounds and stabilizes after the decline in the first decade.The relevant statistical data and analysis results can provide references for scientific research and policy planning on rational land use and ecosystem protection in the southwest mountainous areas.关键词
汶川县/随机森林模型/土地覆盖/变化方向模型/生态系统综合功能Key words
Wenchuan County/random forest model/land cover/change orientation model/comprehensive function of ecosystem分类
天文与地球科学引用本文复制引用
张博,江航,江耀,陈康奕,宋云帆,汪致恒,张瑞..基于随机森林的汶川县土地覆盖遥感监测与生态系统功能变化分析[J].北京测绘,2025,39(6):867-872,6.基金项目
重庆市自然科学基金(CSTB2022NSCQ-MSX1671) （CSTB2022NSCQ-MSX1671）
四川省测绘地理信息学会资助项目(CCX202305) （CCX202305）
国土卫星遥感应用重点实验室开放基金(KLSMNR-202309). （KLSMNR-202309）
