东沙海区浅层剖面资料的改进处理     

薛花  文鹏飞 《煤田地质与勘探》2013,41(3):72

针对浅地层剖面仪在东沙海区采集的浅层剖面资料中出现的随机干扰、大值干扰等问题,通过去噪处理手段进行了有效的压制,消除了干扰波对原始资料的污染;针对由于间隔性采集和处理对原始资料造成的时间延迟现象,通过时移校正方法进行了处理;针对剖面中炮号与相应导航文件中的FIX号不存在对应关系的情况,通过提取道头时间、导航时间并在FOCUS模块中编写相应程序,将剖面中炮号与FIX号的关系建立起来。改进处理后的浅层剖面资料为地质分析与解释提供了较好的基础资料。   相似文献   

1992-2010年基于DMSP-OLS图像的环渤海城市群空间格局变化分析   总被引：2，自引：0，他引：2  

范俊甫  马廷  周成虎  周玉科 《地球信息科学学报》2013,15(2):280-288

从DMSP-OLS数据提取城市区域的经验阈值法存在固有的缺陷,经验阈值对不同的空间区域不具备通用性,不适用的经验阈值,将导致城区面积提取具有较大误差,可采用统计数据对经验阈值进行修正以降低误差。本文在大时空尺度条件下以少量样本城市的统计数据对经验阈值方法进行了修正;另采用Elvidge二次多项式模型对DMSP-OLS时间序列数据进行了校正。在此基础上选取总斑块数量、景观总面积、平均斑块大小、最大斑块面积比、斑块密度、景观形状指数、总边界长度、平均边界密度和斑块平均回旋半径共9个景观生态学指标,采用FRAGSTATS 3.3软件计算分析了1992-2010年环渤海区域城市发展的空间格局变化特征。结果表明:1992-2010年间,环渤海区域城市化进程持续较快发展,城市建成区总面积增加了2.14倍,平均城市建成区面积增加了76%,提取到的城市斑块平均回旋半径增加了约26.5%,并且城市景观斑块的复杂度明显上升,可检测到的城镇总个数增加了82%。但是,每100km2内孤立的城市景观斑块数却降低了约76%;大城市持续扩张的相对速度慢于中小城市,城市区域边界密度和整体城市分布景观格局破碎度逐渐降低,核心城市与周围卫星城市的景观斑块的联通性逐步增加。  相似文献   

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王宇谱  吕志平  陈正生  黄令勇 《大地测量与地球动力学》2013,33(4):112-116

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江楠  徐天河  许艳 《大地测量与地球动力学》2013,33(5):44-48

???IGS??????IGU????????????????????????λ??PPP??????????????????????????IGS????????IGU??????????????????????????????PPP????????????????ж?λ?????????????????????????????????IGS?o??????????????????????0.1 ns???????????????PPP??????IGU??????PPP???????X??Y??Z???????????????87.1%??81.8%??91.3%??3D???????87.4%?????????????????????????????  相似文献   

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任政堂 李 辉康开轩  孙少安 《大地测量与地球动力学》2013,33(6):78-80

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赵成彬刘保金  酆少英姬计法 李春周 《大地测量与地球动力学》2013,33(6):41-44

??о???????????????????????????????????????μ?????????????????????????????????550 m×875 m????????????????????????????????????????????????????????????????N20°??22°E????????????и???????????????F₁????SE???ζ???F₂????NW?????????????????F₁????????ζ???F₂?￡???????ζ???F₂???F₁?????????????????????????????????????????????????????F??1??F??2??????????????????????????????????????????????????????С??????????780??800 mF₂????鲢??F₁???????  相似文献   

用有限强地震动记录校正等震线的估计研究   总被引：4，自引：1，他引：3       下载免费PDF全文

陈鲲  俞言祥  高孟潭  冯静 《地震学报》2012,34(5):633-645

选用获得了加速度记录的2011年4月10日四川炉霍MS5.3及2011年8月11日新疆维吾尔自治区克孜勒尔自治州阿图什市与伽师县交界MS5.8地震,研究其快速生成震动图的偏差校正方法;通过台站实际观测值与借助经验性衰减关系估计值之间的残差分析,提出了利用台站数据对缺少台站地区借助经验性衰减关系估计值的对数偏差校正方法; 并比较了圆和椭圆衰减关系模型的对数残差及震动图的分布形态．结果表明, 适合于当地地震动衰减关系plusmn;3倍标准差的标准能够识别一些台站异常数据, 如炉霍MS5.3地震中炉霍地办强震台近场峰值加速度的高频脉冲引起的异常数据;对数偏差校正方法适合于地震动强度速报中缺少台站数据地区借助经验性衰减关系地震动参数估计值的系统偏差校正;圆衰减关系模型只能控制震动的程度,不能控制其分布形态．明确的地震震源机制、震源破裂过程、当地的地质构造背景及余震分布等信息有助于修正震动图的分布形态．   相似文献   

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田颜锋  李姗姗  肖凡 《大地测量与地球动力学》2012,32(2):115-119

]?????????????????????????????????????С???任????????????????????????????С???????????????????????????????С???任??????????????????HaarС????db4С????db6С????sym6С?????????С?????????????????????FIR????????????????б??,?????????С??????????????????????????FIR??????????????????????????db???С????????????????????????????????????????????????????????db???С??????????????sym8С????  相似文献   

Topographic correction-based retrieval of leaf area index in mountain areas   总被引：1，自引：0，他引：1  

Wei Chen  Chunxiang Cao 《山地科学学报》2012,9(2):166-174

Leaf Area Index(LAI)is a key parameter in vegetation analysis and management,especially for mountain areas.The accurate retrieval of LAI based on remote sensing data is very necessary.In a study at the Dayekou forest center in Heihe watershed of Gansu Province,we determined the LAI based on topographic corrections of a SPOT-5.The large variation in the mountain terrain required preprocessing of the SPOT-5 image,except when orthorectification, radiation calibration and atmospheric correction were used.These required acquisition of surface reflectance and several vegetation indexes and linkage to field measured LAI values.Statistical regression models were used to link LAI and vegetation indexes.The quadratic polynomial model between LAI and SAVI (L=0.35)was determined as the optimal model considering the R and R2 value.A second group of LAI data were reserved to validate the retrieval result.The model was applied to create a distribution map of LAI in the area.Comparison with an uncorrected SPOT-5 image showed that topographic correction is necessary for determination of LAI in mountain areas.  相似文献   

Research on angle-dependent to mographic static correction     

CHEN Guangyu  LIU Yang  WANG Kai  ZHANG Yachen 《世界地质(英文版)》2012,15(2):156-160

Reflection data in CMP has influenced seriously in static calculations,especially in some highly weathered and structurally altered circumstances. Because of static correction in the existed problems and requests,the authors studied the angle dependent tomographic static correction,and discussed its basic theory, including the establishment of forward model,the calculation theory of tomography and tomographic static correction. The usage of theoretical models and practical information on the method has been validated. The results show that using these methods to calculate static correction in a complex area,the quality of static correction is greatly improved.  相似文献