Regional insights into the sedimentary organisation of the Walloon Subgroup,Surat Basin,Queensland     

D. Shields  J. Esterle 《Australian Journal of Earth Sciences》2013,60(8):949-967

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塔里木陆块新元古代—早古生代古板块再造及漂移轨迹     

王洪浩  李江海  杨静懿  周肖贝  傅臣建  李文山 《地球科学进展》2013,28(6):637-647

塔里木陆块周缘的新元古界地层记录了涉及Rodinia聚合和裂解的构造热事件,但塔里木在Rodinia超大陆中的位置以及在Rodinia裂解后如何运动尚无定论.采用收集的古地磁数据,并结合塔里木西北缘阿克苏地区的野外工作以及塔里木周缘代表性岩石如A型花岗岩、基性岩墙群、大陆溢流玄武岩和双峰式火山岩等的同位素年代学数据,将塔里木陆块从Rodinia超大陆中裂解的时间限制在830～ 700 Ma BP.之后,塔里木陆块随澳洲板块一起加入冈瓦纳大陆.约在450Ma BP,塔里木陆块和澳洲板块发生分离,并快速北漂,最终在晚古生代加入劳亚大陆.新元古代—早古生代,塔里木陆块整体上从北半球较高纬度向南半球漂移,并在奥陶纪向北半球快速回返.  相似文献   

内蒙古扎鲁特地区上二叠统林西组古盐度分析   总被引：1，自引：0，他引：1  

张健  李晓海  郑月娟  苏飞  甄甄 《地质与资源》2013,22(6):471-477

通过对扎鲁特地区陶海营子剖面和鲁D2井泥岩样品中微量、常量元素和黏土矿物的测定,利用Adams和Couch古盐度计算公式及Walker相当硼判定法、锶钡比值法、硼镓比值法、生物标记化合物等方法,综合分析了扎鲁特地区林西组沉积时水体的古盐度特征.结果表明,鲁D2井林西组沉积时为半咸水环境,陶海营子剖面林西组则为淡水环境,扎鲁特地区林西组沉积时期水体环境有一个逐渐淡化的过程,下部为半咸水的湖泊环境,上部逐渐演化为淡水湖泊环境.半咸化的湖水环境为林西组巨厚层烃源岩的发育提供了有利条件.  相似文献   

微丝解聚剂及微管阻断剂对藓羽藻细胞重建过程的影响     

毛玉峰  刘玉娇  张真  董文 《中国海洋大学学报(自然科学版)》2014,44(12):48-53

某些种类的海洋多核绿藻的原生质被挤出后,其细胞器在人工海水中可立即发生聚集,随后其细胞组分发生重建,形成新的细胞膜与细胞壁,这些重建的细胞在最佳培养条件下,最多有40%能够发育成成熟藻体。细胞骨架系统是细胞内有序性的维系者,也是细胞及细胞器运动的动力源,这些过程都涉及细胞骨架的解聚与重聚合的动态过程。本文利用微丝解聚剂细胞松弛素B及微管阻断剂秋水仙素对藓羽藻(Bryopsis hypnoides)细胞重建过程的影响进行了研究。结果显示,细胞器聚集及聚集体变圆的动力不来自于细胞骨架系统,而原始微丝体系的解聚是细胞器高效聚集的基本条件;细胞松弛素B及秋水仙素都显著抑制细胞膜的形成及细胞内组分有序性重建等后继发育过程,表明细胞骨架系统在这些过程中扮演着重要角色。  相似文献   

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孙美玲  李永树  陈强  蔡国林 《大地测量与地球动力学》2014,34(2):90-94

??????LiDAR???????????????Ч????????????????????????????????????????????LiDAR?????????????????????????DSM???и????????????????????????????в????????????????????????????e????任?????n??DSM???????????????????????ISPRS????????????????????????÷???????????????????????3.51%??7.20%??4.26%??????????????????????????????????????????￡?15?????????????????????????????????С??  相似文献   

基于RFM的高分辨率卫星影像三维重建方法     

康永辉  戴激光  关小东 《测绘工程》2014,(6):33-37

随着高分辨率卫星遥感成像技术的快速发展,基于卫星影像的三维重建技术研究已成为当前国内外研究的热点,但由于种种因素的制约,实现自动化、高精度的三维重建仍然存在很大困难.鉴于此,提出一种基于同源高分辨率卫星影像的三维信息提取方法,其步骤包括利用影像匹配技术获取同名点,通过影像同名点解算像对间几何转换模型,最终基于有理函数模型获取地物点的三维坐标.结果表明,利用文中方法可以实现影像的三维重建,精度上能够满足一定的生产需求.  相似文献   

基于航空影像的屋顶半自动重建研究     

康俊华  邓非  赵子龙 《测绘信息与工程》2014,(4):29-32

以航空影像为数据源,设计了一套完整的屋顶快速半自动建模方案。整个建模流程可分为数据获取、数据预处理、几何建模、纹理映射4个阶段。在数据获取阶段,定义了适合于后续建模的两种房屋的屋顶编码方式。在几何建模阶段,利用带约束条件的Delaunay三角构网来构建复杂屋顶几何结构。在纹理映射阶段,提出了一种纹理优化选择算法,选择最佳纹理进行贴图。实验结果表明,此半自动建模方法重建屋顶模型正确率高,纹理贴图精度满足要求。  相似文献   

Results of the ISPRS benchmark on urban object detection and 3D building reconstruction     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

For more than two decades, many efforts have been made to develop methods for extracting urban objects from data acquired by airborne sensors. In order to make the results of such algorithms more comparable, benchmarking data sets are of paramount importance. Such a data set, consisting of airborne image and laserscanner data, has been made available to the scientific community by ISPRS WGIII/4. Researchers were encouraged to submit their results of urban object detection and 3D building reconstruction, which were evaluated based on reference data. This paper presents the outcomes of the evaluation for building detection, tree detection, and 3D building reconstruction. The results achieved by different methods are compared and analysed to identify promising strategies for automatic urban object extraction from current airborne sensor data, but also common problems of state-of-the-art methods.  相似文献   

A graph edit dictionary for correcting errors in roof topology graphs reconstructed from point clouds     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

In the task of 3D building model reconstruction from point clouds we face the problem of recovering a roof topology graph in the presence of noise, small roof faces and low point densities. Errors in roof topology graphs will seriously affect the final modelling results. The aim of this research is to automatically correct these errors. We define the graph correction as a graph-to-graph problem, similar to the spelling correction problem (also called the string-to-string problem). The graph correction is more complex than string correction, as the graphs are 2D while strings are only 1D. We design a strategy based on a dictionary of graph edit operations to automatically identify and correct the errors in the input graph. For each type of error the graph edit dictionary stores a representative erroneous subgraph as well as the corrected version. As an erroneous roof topology graph may contain several errors, a heuristic search is applied to find the optimum sequence of graph edits to correct the errors one by one. The graph edit dictionary can be expanded to include entries needed to cope with errors that were previously not encountered. Experiments show that the dictionary with only fifteen entries already properly corrects one quarter of erroneous graphs in about 4500 buildings, and even half of the erroneous graphs in one test area, achieving as high as a 95% acceptance rate of the reconstructed models.  相似文献   

Direct georeferencing of oblique and vertical imagery in different coordinate systems     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

Reconstruction of 3D models through integrating vertical and oblique imagery has been studied extensively. For a 3D reconstruction, object point cloud coordinates could be calculated using direct georeferencing (DG) obtained from the direct orientation data of a GPS/INS system. This paper implemented DG approaches for vertical and oblique imagery in the earth centered earth fixed frame (e-frame), local tangent frame (l-frame), and map projection frame (p-frame), respectively. In the p-frame, the earth curvature correction formulas were derived through naturalizing oblique imagery to vertical imagery to achieve a high positioning precision. Five basic stereo-pair models for vertical and oblique imagery were simulated to verify the positioning accuracy of different frames. Simulation experiments showed that DG in the e-frame and l-frame of these five scenarios were rigorous, and no systematic errors were imported by the DG model as these frames are Cartesian. DG in the p-frame has obvious systematic errors which are aroused by the earth curvature and projection deformation unconformity in the vertical and horizontal directions. These errors, however, can be compensated effectively through correcting image coordinates of the oblique imagery by extending the standard image coordinate correction approach and the exterior orientation (EO) height term. After the correction, the absolute positioning error is lower than 1/20 GSD for simulation test-1. In the p-frame, the process is straightforward, and it is convenient for producing maps. For high accuracy DG, though, it is recommended to adopt e-frame or l-frame options.  相似文献