关于用不同因素选方法和随机森林模型绘制山体滑坡易感性图的研究
Tengfei Gu1,2, Jia Li1, Mingguo Wang3
1Faculty of Geography, Yunnan Normal University, Kunming, Yunnan Province, China.
PloS one
|October 12, 2023
概括
因子选显著提高了山体滑坡易感性测绘 (LSM) 模型的准确性. 信息获取比率 (IGR) 方法与随机森林 (RF) 模型相结合,产生了最好的预测性能,突出了其用于滑坡风险评估的实用性.
科学领域:
- 地质科学 地质科学
- 环境科学 环境科学
- 数据科学数据科学数据科学
背景情况:
- 滑坡易感性测绘 (LSM) 对于预测滑坡发生至关重要.
- 输入因子的选择显著影响预测模型的准确性.
- 有效的因素选是构建强大的小微企业模型的关键初步步骤.
研究的目的:
- 评估不同因素选方法对滑坡易感性预测准确度的影响.
- 在LSM的背景下,比较各种因素选技术的性能.
- 确定在京东县对山体滑坡预测最有影响的因素.
主要方法:
- 使用136个山体滑坡事件和11个选定的因素在京东县建立了山体滑坡数据库.
- 应用四种因素选方法:信息获取比率 (IGR),GeoDetector,皮尔森相关系数和多线性测试 (MT).
- 开发LSM的随机森林 (RF) 模型,使用每个选方法处理的数据集,然后使用混矩阵和ROC曲线进行准确性验证.
主要成果:
- 与使用所有原始因子相比,因子选明显提高了LSM模型的准确性.
- IGR-RF模型实现了最高的曲线下面积 (AUC) 值0.9334,超过了非选模型 (AUC=0.9194).
- IGR-RF模型表现出卓越的预测性能,准确地将最大比例的山体滑坡分类到非常高易感区 (51.22%).
结论:
- 因素选是改善LSM模型性能的一个有益的预处理步骤.
- 信息获取比率 (IGR) 方法对于在山体滑坡易感性建模中选择相关因素非常有效.
- 确定了NDVI,海拔和外观是影响研究区域滑坡的最重要因素.
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