航空激光雷达数据处理原理及其应用前景     

隋立春  宋会传  马远新  李建武 《测绘学院学报》2007,(3)

介绍了Airborne Laser Scanning遥感信息获取系统数据的处理方法和原理。该系统获取的地面目标的3维坐标是随机分布的、不规则的、离散的,它们分布在不同的地形表面目标上。对这种系统获取的数据进行处理的目的,就是将上述分布在不同地面目标上的点进行分离。即将分布在地形表面上的点与落在非地形表面上的点进行有效而准确的分离。最后还介绍了该系统的应用领域以及此技术的发展前景。  相似文献   

自适应序贯平差及其应用   总被引：2，自引：1，他引：2  

隋立芬  刘雁雨  王威 《武汉大学学报(信息科学版)》2007,32(1):51-54

基于自适应估计原理和抗差M估计原理，提出了自适应序贯平差和自适应抗差序贯平差法，给出了相应的参数估值公式。计算结果证明，自适应序贯平差能有效地控制模型参数先验信息的异常影响，平衡观测值和参数先验值在参数估计中的贡献;自适应抗差序贯平差能有效地抵制观测异常和模型参数先验信息异常扰动对平差结果的影响。  相似文献   

半参数模型估计的正则核方法   总被引：3，自引：0，他引：3  

曹轶之  隋立芬  高成胜 《测绘科学技术学报》2008,25(4)

针对测量数据处理中系统误差对参数估计的影响,提出了半参数估计的正则核方法.这种方法可以在不知道系统误差具体形式的情况下有效地分离系统误差的影响,并且对系统误差进行估计.由于正则项的引入,有效地避免了对非参数部分的过拟合现象,同时对于小样本的观测值也能取得较好效果.最后通过两个算例证明了该方法的有效性.  相似文献   

The Combined Effect of Plastic Particles Size and Concentration on Rotifers’ (Brachionus plicatilis) Performance     

SUI Yanming  WANG Senyang  MOHSEN Mohamed  ZHANG Longsheng  SHEN Mengyan  LIU Zhiquan  NGUYEN Haidang  ZHANG Shengmao  LI Kaixing  LV Linlan  DONG Xuexing 《中国海洋大学学报(英文版)》2022,21(2):509-519

The presence of microplastics in aquatic ecosystems is of increasing global concern.Nano-sized plastics,in particular,can penetrate the cell membrane and cause biological death.Our study evaluated the combined impacts of several polystyrene mi-crospheres’sizes and nominal concentrations on the overall performance changes of Brachionus plicatilis.Experimental animals were exposed to three microplastic sizes(0.08,0.5 and 6μm)and five nominal concentrations(0,0.5,2,8,32μg mL?1)for 20 d.Our results showed that the toxicological effect of particle size on rotifers did not significantly depend on the nominal concentration.The interaction between the nominal concentration and size occurred only for body length and lorica width.Specifically,high nominal concentrations of microplastics that were close to nanometer size significantly impaired the overall vitality of rotifers,embodied in shortage of body type,delay in the arrival of maturity,reduction in the cumulative number of neonates,and the advance of the death process.In comparison,fair-sized size(0.5 and 6μm)displayed non-significant damage except for individual groups.Most notably,the net reproductive yield was only a third of what it was in the original environment,implying that there was not much fertility left.Besides,with the development of rotifers,the adverse effects of polystyrene microsphere drive had become more and more serious.  相似文献   

德国新型雷达遥感系统TerraSAR-X介绍   总被引：2，自引：0，他引：2  

隋立春  徐花芝  李建武 《测绘科学技术学报》2007,24(5):321-323

2007-06-15,德国雷达遥感卫星TerraSAR-X在俄罗斯位于Kazachstan的Baikonur发射中心发射成功.4d后,第一批雷达数据成功传回到位于德国Neustrelitz的德国遥感数据中心(DFD).发射后8周,卫星系统已经完全正常运行,并传回了超过2 500幅雷达图像.第一批影像产品已经由DLR遥感信息处理研究所(IMF)制作完成.  相似文献   

几种最优滤波方法的分析和比较   总被引：1，自引：0，他引：1  

黄贤源  隋立芬  范澎湃 《测绘工程》2007,16(3):35-39

解决状态或信号最优估计问题的方法有很多,主要有Wiener滤波、经典Kalman滤波及以白噪声估计理论为基础的现代时间序列分析方法。系统总结了3种主要滤波方法的基本思想、适用条件,并结合算例进行了分析和比较。结果表明,经典Kalman滤波虽然能处理时变系统,但是求解Riccati方程要求较大的计算量,而现代时间序列分析方法则通过构造ARMA信息模型来代替求解Riccati方程,虽减少了计算量,但该方法仅仅适用于处理时不变系统。  相似文献   

Using the physical decomposition method to study the effects of Arctic factors on wintertime temperatures in the Northern Hemisphere and China     

SUI Cuijuan  ZHANG Zhanhai  CAI Yi  WU Huiding 《极地研究(英文版)》2014,(4)

The physical decomposition method separates atmospheric variables into four parts, correlating each with solar radiation, land–sea distribution, and inter-annual and seasonal internal forcing, strengthening the anomaly signal and increasing the correlation between variables. This method was applied to the reanalysis data from the National Centers for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR), to study the effects of Arctic factors(Arctic oscillation(AO) and Arctic polar vortex) on wintertime temperatures in the Northern Hemisphere and China. It was found that AO effects on zonal average temperature disturbance could persist for 1 month. In the AO negative phase in wintertime, the temperatures are lower in the mid–high latitudes than in normal years, but higher in low latitudes. When the polar vortex area is bigger, the zonal average temperature is lower at 50°N. Influenced mainly by meridional circulation enhancement, cold air flows from high to low latitudes; thus, the temperatures in Continental Europe and the North American continent exhibit an antiphase seesaw relationship. When the AO is in negative phase and the Arctic polar vortex larger, the temperature is lower in Siberia, but higher in Greenland and the Bering Strait. Influenced by westerly troughs and ridges, the polar air disperses mainly along the tracks of atmospheric activity centers. The AO index can be considered a predictor of wintertime temperature in China. When the AO is in negative phase or the Asian polar vortex is intensified, temperatures in Northeast China and Inner Mongolia are lower, because under the influence of the Siberia High and northeast cold vortex, the cold air flows southwards.  相似文献   

Projected Climate Change against Natural Internal Variability over China          下载免费PDF全文

JIANG Jiang  SUI Yue  LANG Xian-Mei 《大气和海洋科学快报》2015,8(4)

The ability of 42 Coupled Model Intercomparison Project Phase 5(CMIP5) models in simulating the annual and seasonal temperature and precipitation over China is first examined by using their historical experiments for 1986–2005, and then 39 relatively reliable models are chosen to project temperature and precipitation changes against the natural internal variability over the country under the Representative Concentration Pathways(RCP) scenarios in the 21 st century. The result shows the temperature continuing to increase, especially in northern China. The annual warming for 2081–2099 relative to 1986–2005 over the whole of the country is larger than the background variability, with the multimodel median changes under RCP2.6, RCP4.5, RCP6.0, and RCP8.5 being 9.9, 19.3, 22.8, and 35.9 times greater than one standard deviation of internal variability, respectively. The annual precipitation is projected to increase by 6.1%, 9.3%, 9.6%, and 16.2% for 2081–2099 relative to 1986–2005 under RCP2.6, RCP4.5, RCP6.0, and RCP8.5 respectively, while large changes with high model agreement only occur over the northern Tibetan Plateau and Northeast China, which is mainly due to the robust changes in winter and spring under RCP6.0 and RCP8.5.  相似文献   

气候因子对渤海冰情影响的统计分析   总被引：1，自引：0，他引：1  

唐茂宁  洪洁莉  刘煜  隋俊鹏  赵倩 《海洋通报》2015,34(2):152-157

运用相关分析、偏相关分析等统计分析方法研究了北极涛动、北极海冰和西伯利亚高压等气候因子对渤海海冰年际变化的影响。统计表明西伯利亚高压是影响渤海海冰年际变化最重要的因子。秋季北极海冰密集度、冬季北极涛动与渤海冰情显著相关,它们可能通过影响西伯利亚高压的强度,从而影响渤海海冰的严重程度。利用回归分析得到渤海冰情等级与西伯利亚高压、西太平洋副高之间的统计关系,回归结果较好的反映了渤海冰情年际变化。  相似文献   

大连地区冬季降水相态的预报方法初探   总被引：4，自引：2，他引：2  

隋玉秀  杨景泰  王健  周美娥  肖剑  王丽娜  卞若玢 《气象》2015,41(4):464-473

应用大连本站2003—2012年冬季降水过程的地面与探空资料,提出将判断降水相态的因子分别取其过程最大值和过程最小值并归为最大类与最小类,对降水过程动态地进行研究分析。在探讨各个因子对大连本站冬季降水相态影响的过程中,应用多层平均气温的方法来进行相态研究,并与单层气温和气层厚度的方法进行了对比,综合各项因子评价结果发现：平均气温类别的因子对降水相态的区分效果要好于其他类别的因子。规定等压面平均气温,不但表现优秀而且容易计算,非常适合应用于实际预报工作。设计“逐步排除法”,利用2013年大连本站的地面和探空数据对大连冬季降水进行检验,以及使用2013年日本全球数值预报模式格点资料进行模拟预报,均取得了理想的结果。  相似文献