摘要
喀斯特石漠化是一种常见的土地退化基岩裸露的现象,主要分布在我国西南喀斯特地区,具有分布范围广且有进一步恶化的趋势.利用Landsat8影像,基于决策树分类方法提取凤山县石漠化信息.以NDVI值、植被覆盖度和凤山县坡度分析为分类条件,运用决策树提取凤山县石漠化信息,利用GoogleEarth对最初的分类结果存在错分和漏分的情况纠正,最后得到2021年凤山县不同等级石漠化面积及空间分布情况.结果表明:2021年凤山县石漠化面积约为197.3071 km^(2),占全县土地面积的11.32%,总体分类精度为87.4%,Kappa系数为0.8651.从精度评定结果可知,该方法提取石漠化信息精度可靠,同时也提出了凤山县具有石漠化较为严重的现象.
Karst rocky desertification is a kind of common land desertification,which is mainly distributed in the karst area of Southwest China,with a wide distribution and a trend of further deterioration.Landsat8 image was used to extract rocky desertification information in Fengshan County based on decision tree classification method.Taking NDVI value,vegetation coverage and slope analysis of Fengshan County as classification conditions,the decision tree was used to extract rocky desertification information of Fengshan County,and Google Earth was used to correct the initial classification results.Finally,the area and spatial distribution of different grades of rocky desertification in Fengshan County in 2021 were obtained.The results show that the area of rocky desertification in Fengshan County in 2021 is about 197.3071 km^(2),accounting for 11.32% of the total land area of the county.The overall classification accuracy is 87.4%,and the Kappa coefficient is 0.8651.From the results of precision evaluation,it can be seen that the precision of extracting rocky desertification information with this method is reliable,and it also reveals that the rocky desertification in Fengshan County is relatively serious.
作者
苏成杰
施宇军
范亚军
SU Chengjie;SHI Yujun;FAN Yajun(School of Civil Engineering,Guangxi Polytechnic of Construction,Nanning 530007,China)
出处
《河南科学》
2024年第4期522-528,共7页
Henan Science
基金
广西高校中青年教师科研基础能力提升项目(2021KY1154,2023KY1196)。
关键词
石漠化
Landsat8
决策树分类法
凤山县
rocky desertification
Landsat8
decision tree classification method
Fengshan County
