基于证据权方法的玉树地震滑坡危险性评价   总被引：5，自引：0，他引：5       下载免费PDF全文

许冲  徐锡伟  于贵华 《地震地质》2013,35(1):151-164

玉树地震诱发了2 036处滑坡。应用地理信息系统与遥感技术,选取与地表破裂距离、峰值加速度(PGA)、高程、坡度、坡向、曲率、坡位、与水系距离、岩性、与断裂距离、与公路距离、归一化植被指数(NDVI)等12个因素作为玉树地震滑坡危险性评价因子,采用加法与减法2种证据权方法,开展玉树地震滑坡危险性评价研究工作。结果表明:基于加法证据权方法得到评价结果的正确率为80.32%,基于减法证据权方法得到结果的正确率为80.19%。将滑坡危险性评价结果图分为极高危险区、高危险区、中危险区、低危险区与极低危险区5类。这一成果可划分出滑坡危险区,为灾后滑坡防治、基础设施重建与自然环境保护提供参考。  相似文献   

A novel ensemble approach of bivariate statistical-based logistic model tree classifier for landslide susceptibility assessment     

Wei Chen  Ataollah Shirzadi  Tao Li  Chen Guo  Haoyuan Hong 《国际地球制图》2013,28(12):1398-1420

Abstract

This study addresses landslide susceptibility mapping (LSM) using a novel ensemble approach of using a bivariate statistical method (weights of evidence [WoE] and evidential belief function [EBF])-based logistic model tree (LMT) classifier. The performance and prediction capability of the ensemble models were assessed using the area under the ROC curve (AUROC), standard error, 95% confidence intervals and significance level P. Model performance analyses indicated that the AUROC values of the WoE–LMT ensemble model using the training and validation data-sets were 86.02 and 85.9%, respectively, whereas those of the EBF–LMT ensemble model were 88.2 and 87.8%, respectively. On the other hand, the AUC curves for the four landslide susceptibility maps indicated that the AUC values of the ensemble models of WoE–LMT (85.11 and 83.98%) and EBF–LMT (86.21 and 85.23%) could improve the performance and prediction accuracy of single WoE (84.23 and 82.46%) and EBF (85.39 and 81.33%) models for the training and validation data-sets.  相似文献   

结合信息熵改进的证据权法与滑坡危险度区划     

杨可明  郭海会  钱小丽  王建超  张丹丹 《地理与地理信息科学》2013,29(3)

滑坡是一种常见的地质灾害,其危害性极大,科学地划分滑坡危险度是防灾减灾工作中主动预测预警的重要环节.该文结合GIS技术与信息熵理论,充分利用熵值法特别适合于确定同一个指标下不同因素相对权重的特点,开展了滑坡危险度区划模型中证据权法的改进研究,并以台湾地区为实验区,在综合考虑滑坡的形成要素并提取滑坡危险度评价因子后,实现了研究区滑坡危险度区划.通过定性和定量等精度检验和对比分析,证明了结合信息熵改进的证据权法所获得的滑坡危险度区划结果更准确且更符合实际.  相似文献   

多传感器数据融合技术与应用   总被引：4，自引：0，他引：4  

陈俊任  王保强  刘心田 《成都信息工程学院学报》2005,20(5):503-509

研究了多传感器数据融合理论的相关算法及其在多传感器系统中的应用，分析了数据融合技术目前在应用方面存在的问题；针对应用证据理论（D-S方法）解决多传感器条件下的数据融合过程中存在的失效问题，给出了修正合成规则；通过实例对其进行了验证。  相似文献   

Combining fractal analysis of mineral deposit clustering with weights of evidence to evaluate patterns of mineralization: Application to copper deposits of the Mount Isa Inlier, NW Queensland, Australia   总被引：3，自引：1，他引：2  

A. Ford  T.G. Blenkinsop 《Ore Geology Reviews》2008,33(3-4):435-450

The clustering of mineral occurrences and their spatial associations with particular geological features are critical aspects of mineral distributions for exploration and understanding ore genesis. Variations in the degree of clustering of mineral occurrences or geological features can be measured by fractal dimensions, obtained from a shifting box counting method. Spatial associations between mineral occurrences and geological features can be quantified by the weights of evidence (WofE) method using the contrast value, which increases with the strength of the spatial relationship. A new method is proposed to evaluate mineral occurrence distributions by combining the power of fractal analysis of clustering with the WofE approach. The method compares the correlation between the variation in degree of clustering of mineral occurrences and a geological feature in a study area, with the contrast value of the same feature. The possible outcomes can be simplified into four scenarios, depending on whether the correlation in variation of clustering and the contrast are high or low, respectively. Each outcome has specific exploration implications. If either a high correlation in variation of clustering or a high contrast value is obtained, the geological feature can be used for exploration targeting.The integrated fractal and WofE approach is applied to copper occurrences in the Proterozoic Mount Isa Inlier, NW Queensland, Australia, which hosts large numbers of copper deposits (1,869 occurrences), including the world class Mount Isa copper deposit. Variation in clustering of copper occurrences has a positive correlation with variation in clustering of fault bends (R = 0.823), fault intersections (R = 0.862) and mafic rocks (R = 0.885). WofE results indicate that the copper occurrences are spatially associated with fault intersections and bends and with mafic rocks. Analyses were carried out separately for the two major lithostratigraphic sequences in the Inlier, the Eastern and Western Successions. The Western Succession copper occurrences are apparently more clustered than those of the Eastern Succession, which may reflect a lower degree of exploration and/or geological factors. The association of copper occurrences with mafic rocks compared with fault bends and intersections is greater in the Eastern Succession, which may reflect genetic factors. Correlations in the variation of clustering of mineral occurrences and geological features have a linear relationship with the contrast values, and the spatial association between all geological features and copper occurrences constitute high correlation/high contrast cases. The linear relationship suggests that the geological features that control the clustering of the copper occurrences could be the same features that control their localization.  相似文献   

基于证据加权模型的青海拉陵灶火地区矿产靶区预测及效果评价研究   总被引：1，自引：0，他引：1  

林楠  陈永良  路来君  姜琦刚  吴梦红 《地球学报》2016,37(6):756-762

当代矿产资源评价是复杂高维非线性系统的建模与评价过程,建立能够描述综合信息间复杂关系的多元非线性统计模型并预测矿产靶区,对矿产勘查具有重要指导意义。本文基于GIS软件平台,将证据加权模型应用于青海拉陵灶火地区矿产靶区预测,提取研究区成矿地质背景信息,遥感地质信息,地球化学异常信息等17种致矿综合信息,建立研究区矿产靶区预测模型,绘制成矿后验概率分布图,并利用ROC曲线分析方法对预测结果进行效果评价,根据ROC曲线的TP率和FP率计算圈定矿产靶区概率阈值,对研究区矿产靶区进行了圈定,结果表明证据加权和ROC曲线分析相结合圈定的成矿靶区与已知矿点分布较为吻合,该方法用于矿产靶区预测具有一定的可行性。  相似文献   

基于证据加权模型的综合信息成矿预测     

杨佳佳  林楠 《地质学报》2016,90(10):2908-2918

综合信息成矿预测是复杂高维非线性系统的建模与评价过程,通过识别和提取地、物、化、遥等多源地学观测数据中的综合致矿地质异常信息,并以此为依据进行成矿预测。成矿预测是在科学预测理论的指导下,应用地质成矿理论和数理统计方法对地质、物探、化探、遥感等信息进行充分挖掘,剖析成矿地质条件,总结成矿规律,建立综合信息成矿模型并应用于成矿预测,从而圈定和评价成矿远景区,为区域找矿工作部署和矿产资源开发利用的统筹规划提供科学依据。本次研究将证据加权模型引入到成矿预测研究中,通过建立和评价地质信息、化探信息、遥感蚀变信息、遥感线环形构造密度信息与已知矿化点的关系,然后用贝叶斯公式计算成矿后验概率,推出研究区成矿预测结果。研究结果表明:综合信息成矿模型预测结果符合研究区地质成矿规律,和已知成矿点吻合率达71.4%。  相似文献   

新形势下工程档案管理工作中的问题及对策     

张秀辰 《中国勘察设计》2010,(6):55-57

本文阐述了在工程勘察设计行业高速发展的形势下档案管理工作中面临的问题,如档案的归属、档案数量的增加、现代企业制度的建立、档案信息化建设、工程档案编研等,并针对这些问题提出了自己的见解。  相似文献   

基于GIS的证据权重法在内蒙古阿鲁科尔沁旗地区成矿预测中的应用   总被引：3，自引：0，他引：3  

刘晓玲  陈建平 《地质通报》2010,29(4):571-580

内蒙古赤峰市阿鲁科尔沁旗地区地跨大兴安岭东坡、主峰、西坡3个成矿带,具有良好的成矿条件。在提取该地区的地质、物探、化探和遥感基础信息的基础上,以地质异常理论为指导,运用数理统计分析的方法和GIS技术,综合分析多源数据,提取不同的成矿信息标志,利用证据权重法对研究区进行成矿定量预测与评价。此次预测工作共选出15个证据因子层,对该地区以热液型矿床为主的有色金属矿产进行定量预测与评价,最终得出3个远景区。  相似文献   

高拱坝多效应量改进型D-S证据理论融合模型     

何金平  马传彬  施玉群 《武汉大学学报(信息科学版)》2012,37(12):1397-1400

针对目前高拱坝监测资料分析中单效应量分析方法存在的不足,将数据融合技术中的D-S证据理论引入到高拱坝多效应量融合建模之中,提出了一种适合于高拱坝D-S证据融合评价的新的融合系数运算公式,建立了基于改进型证据理论的高拱坝多效应量融合模型。工程实例分析表明,该方法合理、可行,并可降低高拱坝安全评价中的不确定性与未知性。  相似文献