基于能量比与互相关法的地震剖面反射同相轴交互自动拾取研究   总被引：3，自引：1，他引：2  

丁维凤  潘国富  苟铮慷  傅晓明  张济博  胡涛骏 《海洋学报》2012,34(3):87-91

为提高地震剖面反射同相轴拾取的精度与效率,结合实际资料详细讨论了能量比与互相关两种自动拾取方法的优缺点,提出对拾取结果进行光滑滤波处理,以消除资料上的随机噪音与风浪干扰等影响。同时讨论了参考种子点在自动拾取算法中的重要性,以及人机交互拾取参考种子点的实现方法。针对复杂界面的反射同相轴,在自动拾取结果的基础上,文中提出以人机交互的方法进行修改拾取。将这些方法综合运用于实际资料,以取得满意的拾取结果。  相似文献   

反射波走时人机交互多域拾取方法及软件设计     

马飞  张建中  赵铁虎  孙运宝 《CT理论与应用研究》2015,24(4):503-515

地震反射走时拾取是反射走时层析成像的首要环节。本文提出一种基于共炮点域、共检波点域、共中心点域、共偏移距域的多域人机交互反射波走时拾取方法。通过分析地震记录在不同域的特征,选择最佳的域进行反射波同相轴的拾取,在人机交互的环境下采用人工和计算机相结合,提高拾取的准确度和效率。利用Qt语言编程实现了地震资料的多域显示及反射波走时多域人机交互拾取软件。合成地震记录和实际地震资料的走时拾取结果表明,该软件操作灵活方便,对复杂地震资料的反射波走时拾取取得良好效果。   相似文献   

基于动态阈值法的NOAA系列卫星云检测结果检验     

武艳  银燕  师春香  何立  胡婷婷  孟俊耀 《高原气象》2012,31(3):745-751

采用我国地面报资料、国际船舶报资料和云卫星(CloudSat)产品,分别对多通道动态阈值云检测方法的云检测结果进行了检验。结果表明,动态阈值云检测方法可用于长时间序列卫星观测数据的云检测,不仅运行速度较快,可实现全自动,且精度较高,陆地上空云检测准确率为82.8%(地面报资料),海洋上空云检测准确率为91.5%(船舶报资料)。此外,还利用CloudSat资料检验不同观测时间差对NOAA系列卫星云检测结果检验的影响。  相似文献   

基于Viterbi算法的复杂地质体速度约束化自动拾取   总被引：1，自引：0，他引：1  

林年添  刘洪  李建勇 《地球物理学进展》2004,19(2):311-316

对于复杂地质体而言,由于各种因素的影响,速度信息中往往会包含一些假的速度信息(如速度异常值)．因此,如何在速度谱能量团(由所定义目标函数——相似系数法等得到)中拾取有效的叠加速度,是地震数据处理中一个重要的环节．本文,所引入的Viterbi算法具有约束化自动搜寻并获取最优解的功能,将其应用于速度的自动拾取中,它能向前做最大“能量团”的积分并向后递归计算最优解——叠加速度,是一种实现速度自动优化拾取的便利工具．  相似文献   

The university of New South Wales automated patrol telescope     

B. D. Carter  C. S. Bembrick  M. C. B. Ashley  P. Mitchell 《Experimental Astronomy》1994,5(1-2):81-85

The Automated Patrol Telescope is a wide-field CCD imaging telescope of novel design. The telescope is a converted Baker-Nunn satellite tracking camera that has undergone extensive modification to its optical, mechanical and electronic systems. Telescope operation is entirely under computer control, and the instrument is to be used for a variety of astronomical survey and monitoring projects.  相似文献   

Application of AMD to the Determination of Crop Protection Agents in Drinking Water. Part IV: Fundamentals of a Confirmatory Test     

K. Burger  H. Jork  J. Khler 《洁净——土壤、空气、水》1996,24(1):6-15

A method is described for the determination of fifteen active ingredients of plant protecting products in ground-, raw, and drinking water. After extraction and enrichment of the pesticides from the water sample with solid-phase extraction, the extract is fractionated on silica-coated TLC plates, first in a so-called screening gradient by AMD (automated multiple development). The detection of the pesticides is performed by UV multidetection. Positive results from the first separation are confirmed by a second separation on silica in an AMD gradient of distinctly different selectivity, compared to the first separation. Following this strategy, it is possible to distinguish nearly all nonvolatile, from water extractable, active ingredients of plant protecting products in the market. UV spectra are taken for further confirmation of positive results. In most cases, this is possible even at the limit of determination. All chromatograms and spectra shown are raw data, resulting from the confirmatory test DIN 38407 part 11, in the laboratory of one participant*). The method is standardized in the meantime as DIN V 38407-11.  相似文献   

关系处理中要素重叠的自动判别     

武芳 《测绘学院学报》1997,(1)

关系处理一直是自动制图综合中解决起来困难比较多的一个问题,而解决关系处理的前提则是要素重叠位置的自动识别。本文着重讨论数据库条件下进行要素重叠自动识别的方法及其在编图实践中的应用。  相似文献   

BP神经网络的改进及其在初至波拾取中的应用   总被引：2，自引：3，他引：2  

王金峰  罗省贤 《物探化探计算技术》2006,28(1):14-17

在地震资料处理中,正确的初至时间,是解决复杂地表静校正问题所需的关键参数。将BP神经网络引入到初至波拾取中,并针对经典BP神经网络收敛速度慢、易于陷入局部极小的缺点,利用组合函数法、限幅法、动量因子法及自适应学习率法等进行了改进。用模拟试验证明了这些改进方法的可行性和有效性,在应用于实际的地震记录初至波拾取中,取得了良好的应用效果。  相似文献   

A neural-tree-based system for automatic location of earthquakes in Northeastern Italy     

S. Gentili  P. Bragato 《Journal of Seismology》2006,10(1):73-89

A neural network system for P and S-picking and location of earthquakes in Northeastern Italy is described. It is applied to 7108 seismograms corresponding to 1147 earthquakes occurring in Northeastern Italy and surrounding area in the period 2000–2003. Its results are compared with two sets of manual picks and with the picks performed by the existing seismic alert system. The new system recognizes 89% and 67% of P and S arrival times, respectively, which allows locating 92% of the earthquakes. P and S-picks differ from the best available manual picks by 0.00 ± 0.07 s and 0.00 ± 0.18 s, respectively. The corresponding earthquake locations differ by −0.18± 0.77 km in longitude, 0.10± 0.62 km in latitude and 0.1± 2.0 km in depth. These results suggest its use for alert purposes and rapid production of preliminary bulletins.Considering a subset of picks that are common to all the available data sets, the absolute accuracy (i.e., the inverse of the standard deviation of differences between the estimated and the true, unknown arrival times) of each picking method is estimated. The best available manual data set has standard deviation 0.03 s for P waves and 0.07 s for S waves, while for the new system it is 0.06 s and 0.18 s for P and S waves, respectively.This paper has not been submitted elsewhere in identical or similar form, nor will it be during the first three months after its submission to Journal of Seismology.  相似文献   

用共偏移距初至曲线联动共炮点道集拾取地震波初至     

皮金云  王彦春  张静 《物探与化探》2007,31(2):164-166,170

在共偏移距初至曲线上，针对初至偏大和初至偏小的点，分别设置不同的计算参数，联动共炮点道集进行初至批量修改。在初至自动拾取算法上，利用波谷波峰比，结合参考初至、拾取时窗以及门槛值等参数，较好地解决了低信噪比地区初至拾取精度和效率问题。  相似文献