用距离交会算法进行测点坐标改正     

程铭  熊助国  杨艳艳 《华东地质学院学报》2007,30(1):47-50

在野外数据采集过程中,时常会遇到由控制点数据错误产生测点位置错误问题。总结分析了可能出现的多种情况,归纳出了错误的类型。并且提出了采用距离交会算法对测点坐标进行改正的新方法,导出坐标数据改正的数学模型,总结出了用一种数学模型解决控制点坐标有误、无控制点坐标等多种错误类型的测点坐标改正方法及其注意事项。并用VC 编写了相应的程序工具,经实验数据验证了它的可行性和正确性。该方法的提出和应用,可提高外业测绘工作的效率,具有较高的实际应用价值。  相似文献   

Estimation of characteristic parameters in region-time-length algorithm and its application     

荣代潞  李亚荣 《地震学报(英文版)》2007,20(3):265-272

On the basis of gap's temporal-spatial characteristics in and around source area before an earthquake, we propose a method to estimate characteristic parameters (characteristic distance and time) in the region-time-length (RTL) algorithm and introduce the method of correlation coefficient developed by some authors in 2006 to determine the characteristic parameters. The anomalous seismic activities before four moderately strong earthquakes occurred in the northwestern and southwestern China in recent years are studied by the two methods. The results show that the method to estimate characteristic parameters advanced in this paper is a simple one, which possesses a physical meaning and is well applicable to the four moderately strong earthquakes studied.  相似文献   

化爆标定地震定位方法研究     

李学政  雷军  刘文学  范广超  沈旭峰 《中国地震》2007,23(3):319-326

定位仿真表明,若标定震源在网内,震中偏差和震源深度偏差等值线都是以标定震源为圆心的同心圆,网内大约30%的事件,震中偏差为5%;如果标定震源位于台网一侧,约10%事件的震中误差为10%。无论标定源在网内还是在网外,计算震中都向标定震源方向移动,距标定点愈远,定位偏差愈大。速度标定定位显示,规则地震台网中对称线上的震源定位是不可靠的。实际网内化爆标定定位表明,对于网内事件,爆炸邻域定位精度比速度标定定位精度高;对于网外事件,邻域标定定位精度比速度标定定位精度低。  相似文献   

Application of discriminant analysis and generalized distance measures to uranium exploration     

J. J. Beauchamp  C. L. Begovich  V. E. Kane  D. A. Wolf 《Mathematical Geology》1980,12(6):539-558

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Ecological Cost-Benefit Modelling of Herbivore Habitat Quality Degradation due to Range Fragmentation     

Henrik Lundqvist 《Transactions in GIS》2007,11(5):745-763

Fragmentation of grazing ranges and ensuing rise in edge effects decrease forage range quality for large herbivores. A method is proposed to quantify, in ecological cost‐benefit terms, the negative impact of fragmentation by linear structures with special emphasis on summer ranges of semi‐domesticated reindeer (Rangifer t. tarandus). The method is also applicable to other terrestrial species and on different scales. The term ‘reachability’ is introduced for this measurement, which integrates forage quality, quantity and availability, as well as the costs of the animal's movement in a variable landscape and across fragmenting linear structures. The method uses a cost‐distance algorithm, commonly available in GIS software. Effective distances and reachability over large areas are calculated from evenly distributed sample points. Effects of varying sample point distance, fragmenting structure friction weight and density, and edge effect depth were analysed for model calibration. In an example the model was used for estimation of reachability alteration due to linear structures in the summer ranges of the Handölsdalen reindeer herding district in Sweden, where hourly GPS positions of 10 free‐ranging female reindeer were available. In these data the reindeer population density appeared to decrease up to 1 km away from roads, but no effect from hiking trails was detected. The reachability model quantified a loss of 2.2–2.7% in range quality due to range fragmentation.  相似文献   

The Four Intersection-and-Difference Model for Line-Line Topological Relations     

DENG Min LI Zhilin LI Guangqiang ZHANG Xuesong 《地球空间信息科学学报》2007,10(4):293-298

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天线相位中心偏移和变化对高精度GPS数据处理的影响   总被引：6，自引：0，他引：6  

郭际明  史俊波  汪伟 《武汉大学学报(信息科学版)》2007,32(12):1143-1146

介绍了GPS天线相位中心偏移、变化的校准方法和GPS天线相位中心改化的原理，并通过GAMIT软件描述了改化算法。计算了天线相位中心变化对GPS定位结果的影响，给出了高精度GPS数据处理中关于天线相位中心改化的方法和建议。  相似文献   

鄂西南溶洞旅游资源空间分布特征     

徐松华 《中国岩溶》2018,37(3):440-449

在收集各类资料和实地调查的基础上,运用ArcGIS软件定量分析了鄂西南溶洞旅游资源的空间分布特征,总结出鄂西南溶洞旅游资源在鄂西南10个县（区）都有分布,平面上集中分布在清江、溇水、酉水和唐崖河等主要河道干流近岸地带2 500 m的范围内和其支流近岸地带1 800 m的范围内,在垂向上形成低海拔溶洞、中低海拔溶洞、中海拔溶洞、中高海拔溶洞和高海拔溶洞5级的阶梯状分布特征。   相似文献   

基于DIMINE软件的某铁矿地质建模及储量估算     

邓勇  庄世勇  洪求友 《江苏地质》2018,42(2):305-311

借助DIMINE数字矿山软件,运用矿山地质统计学方法,对辽宁某铁矿进行地质建模与铁矿资源储量估算。通过收集该铁矿的勘探钻孔孔口数据、测斜数据、样品数据及地形地质图等地质勘探资料,使用DIMINE软件完成了矿区钻孔数据库建立、样长组合、矿体及夹石三维模型、建立块段模型、TFe品位分析、储量估算,为合理开发有限资源提供科学指导。  相似文献   

采空区松散堆积物注浆模型试验研究     

刘亚明 《地下水》2015,(1):197-199

以采空区松散堆积物为研究对象,分别设计模型箱注浆模型和压力注浆模型对浆液的扩散规律进行试验研究,探讨注浆压力、浆液水固比、孔隙率和注浆量对浆液扩散距离的影响规律。试验结果表明:注浆压力、浆液水固比、孔隙率和注浆量四个因素与浆液扩散距离之间存在定量关系,可用公式进行拟合,影响浆液扩散距离最为显著的是堆积物孔隙率,其次是注浆量和浆液水固比,注浆压力对浆液扩散距离的影响相对较小;浆液在松散堆积物中流动的压力损失是由浆液流速的不均匀性、浆液与松散堆积物的碰撞、浆液扩散时与堆积物的摩擦等原因造成的;对浆液在松散堆积物中扩散速率影响最为显著的是注浆压力,其次是堆积物孔隙率,浆液水固比影响最小。  相似文献