滑坡危险度制图精度评价指标的有效性研究

发布时间：2018-01-26 11:09

本文关键词： 评价指标制图精度滑坡危险度制图　出处：《自然灾害学报》2017年02期 　论文类型：期刊论文

【摘要】：对滑坡危险度制图进行精度评价具有重要意义。现有对滑坡危险度制图进行评价的研究多集中于评价指标的建立和应用,而评价指标能否有效地度量滑坡危险度图的精度、区分不同质量的滑坡危险度图尚值得研究。针对只使用正样本的评价指标,选择其中3种常用的非阈值依赖性评价指标——预报效率曲线及曲线下面积、P/E曲线及连续Boyce指数和空间聚集度作为精度评价标准,以甘肃省油坊沟流域为研究区,采用正样本和不同的负样本,基于随机森林模型推测生成不同质量的滑坡危险度图,应用3个评价指标对其进行精度评价,验证了各评价指标的有效性。结果发现,预报效率曲线与P/E曲线的分布可以体现不同质量的滑坡危险度图的差异,但是预报效率曲线下的面积只适宜于滑坡危险度高估时的制图精度评价,而连续Boyce指数与空间聚集度只适宜于滑坡危险度低估时的制图精度评价。
[Abstract]:It is of great significance to evaluate the accuracy of landslide hazard mapping. The existing researches on landslide hazard mapping mostly focus on the establishment and application of evaluation indexes. Whether the evaluation index can effectively measure the accuracy of landslide hazard map and distinguish the landslide hazard map of different quality is worth studying. Three commonly used non-threshold dependent evaluation indexes, the prediction efficiency curve, the area under curve P / E curve, the continuous Boyce index and the spatial aggregation degree, are selected as the accuracy evaluation criteria. Taking Youfanggou watershed in Gansu Province as the study area, using positive samples and different negative samples, the landslide hazard map of different quality was generated based on stochastic forest model, and three evaluation indexes were used to evaluate its accuracy. The results show that the distribution of prediction efficiency curve and P / E curve can reflect the difference of landslide hazard map of different quality. However, the area under the prediction efficiency curve is only suitable for the mapping accuracy evaluation when the landslide risk is overestimated, while the continuous Boyce index and spatial aggregation are only suitable for the mapping accuracy evaluation when the landslide risk is underestimated.
【作者单位】：虚拟地理环境教育部重点实验室(南京师范大学);江苏省地理环境演化国家重点实验室培育建设点;江苏省地理信息资源开发与利用协同创新中心;中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室;Department
【基金】：国家自然科学基金项目(41431177,41471178) 江苏省高校自然科学研究重大项目(14KJA170001) 国家重点基础研究发展计划973项目(2015CB954102)~~
【分类号】：P642.22
【正文快照】： 滑坡是一种重要的自然灾害,具有分布广、频率高、成灾快等特点,给全球造成了极大的经济损失和人员伤亡[1]。滑坡危险度(landslide susceptibility)是指某一区域在地形地貌、地质环境、覆被等基础孕灾条件下发生滑坡的可能性[2-5]。滑坡危险度评价不考虑“极端气候条件”、“地

【相似文献】