融合超体素与成对链接聚类的LiDAR点云分割算法

针对现有的LiDAR点云分割算法稳健性差、效率低的问题,本文提出了一种新的层次化聚类分割算法。该算法首先把点云生成自适应分辨率的超体素,然后以超体素为基元,改进成对链接的分割算法,实现三维点云的分割。试验结果表明,该分割算法与现有的分割方法相比,具有更好的稳健性和更高的计算效率,避免了点云过分割和欠分割的问题。本文算法在分割细节方面更加突出,分割结果可有效地保证后续数据处理工作的精度。     

Occurrence and composition of sphene from eastern fold belt, Mount Isa Inlier, Cloncurry, northwestern Queensland, Australia

Sphene is very common in rocks including albitized granite, dioritic porphyrite, calcsilicate rock and breccia from the eastern fold belt of Mount Isa Inlier, Cloncurry. Two stages of sphenes are present in these rocks. First-staged sphene is relatively fine, euhedral, some grains show round or patchy zoning; second-staged sphene is relatively large, anhedral to subhedral, some grains show patchy zoning;both possibly contain rutile, ilmenite and magnetite inclusions. All sphenes are of low-Al type. The second-staged sphene has lesser Fe apfu than the first-staged sphene. Light-color part of the sphene has bigger Fe apfu than the dark-color part, as observed on one individual grain of sphene with patchy zoning, the average Xro of the sphene with patchy zoning is greater than that of the sphene without patchy zoning. Because the sphenes are taken from different types of rocks, Si, Ti, and Al have variable relations with F OH apfu. Si and Ti are not correlated with OH F in all analyzed samples ; Fe is correlated with OH F in the sphene just from granite and dioritic porphyrite; Al is correlated with OH F in the sphene fromgranite and breccia and is not correlated with OH F in the sphene from the dioritic porphyrite and calcsilicate rocks. The first-staged sphenes were possibly formed in the processes of magmatism and metamorphism. The second-staged sphenes were formed as a result of the breakdown of hornblendes and biotites in the process of Na (Ca) -metasomatism.     

阿拉木图和乌鲁木齐试验场地磁变化对比分析

对1990～2005年期间哈萨克斯坦阿拉木图试验场和中国新疆乌鲁木齐试验场的连续地磁观测资料进行了对比分析,重点选择库尔特、图尔根、喀什和乌鲁木齐地震台站的地磁观测资料.分析了北天山中部、南部和东部地区地磁场变化的长期、季节、短期和局部分量的表现特征.     

星际钙线的等值宽度

本文利用威尔逊山天文台高度色散光普图,加以归算,求得1+1颗星的星际K和H普线的等值宽度。其中有44颗星,我们能测得每一谱线的几个成分,它们是被星际几个分离的云的消光作用所作成的。     

安徽地质环境、自然景观及其美学评价

论述了安徽省的地质环境及美学评价,以及保护地质环境的意义.     

海安地磁极小值时间分布特征与震前异常

在地磁场日变形态中,极小值分布的时间特征及与地震的关系已成为地磁工作者关注的课题。本文对海安台历年(1981—1989)地磁(Z)分量极小值的时态分布、位移与地震的相关性进行了探讨。     

高温干旱地区大豆复播及间作丰产研究

在高温干旱的吐鲁番盆地,大田复播大豆被视为“禁区”.吐鲁番农业气象试验站通过大豆播种配套技术的研究和立体式栽培格式的研究,既解决了大豆出苗难的问题又迎合了大豆的生育习性,终于获得了在高温干旱地区复播大豆及间作丰产的成功.     

什麽是動力地質学?

本文原载苏联”科学与生活”1955年第6期间答欄,係该刊读者所提关於动力地质学研究什么及发展远景怎样一问题的答覆。作者是苏联地质矿物学博士高尔什科夫教授,原题为“动力地质学”——编者动力地质学在地质科学这一广大领域内占有重要地位。     

三角测量全面布网精度估算

全面网的边长及方位角的精度估算,对于布网理论及实际应用有着重大意义。本文提出全面三角网精度估算的经验公式,其误差为5％左右,一般不超过10％。