SRG剖分编码与地理坐标的转换算法研究     

张玉梅  聂洪山  谢启友  孙兆林  徐欣 《地理与地理信息科学》2012,28(2):40-43

提出一种基于SRG剖分方法的剖分编码与经纬度坐标之间的转换算法,不涉及任何投影变换,计算过程只需加、减、乘、除简单算术运算,计算速度快,且SRG剖分编码本身就具有固定的方向性,利于邻近搜索。算法中采用坐标系辅助区分一些难以区分的菱形块,降低了转化误码率,进而提高了转换的精度。  相似文献   

遥感分景数据的剖分索引模型     

谭亚平  程承旗  耿晓晖 《地理研究》2012,31(6):1132-1142

随着空间技术和对地观测技术的飞速发展,海量遥感影像索引成为目前国内外学术界和应用部门面临的一大难题,地球剖分系统的产生为这一难题的解决开辟了新的途径。本文首先研究了遥感分景数据的特征和EMD全球剖分的特征,然后针对现有遥感影像数据索引方法的不足,提出了基于EMD剖分系统的三种索引模型:基于影像—面片映射关系的索引模型、基于EMD数据模型的索引和剖分数据标识索引模型,从三个不同的方面探讨了解决索引问题的方法和思路。并给出了利用遥感分景数据的剖分索引模型对线状对象和面状对象进行索引应用的实例。遥感分景数据的剖分索引模型的建立为遥感影像数据的高效存储和索引提供了一种有益的新思路。  相似文献   

滇西北羊拉铜矿区地层划分   总被引：10，自引：0，他引：10  

朱俊  曾普胜  曾礼传  尹静  董涛 《地质学报》2009,83(10):1415-1420

通过滇西北羊拉矿区7.5km实测地层剖面的岩石地层划分,矿区原定二叠纪嘎金雪山群巨厚洋盆沉积实际由泥盆纪至二叠纪构造岩块高度混杂而成。因矿区经历了金沙江洋盆的初始裂开、扩张、俯冲消减、碰撞造山的洋－陆转换过程,岩石普遍发生绿片岩相变质作用,缺少古生物化石,原岩层序难以恢复。基于前人成果和本次工作发现的牙形石,结合矿区沉积特征和金沙江洋演化历史,将地层修订为下泥盆统江边组岩块、中泥盆统－石炭系岩块、二叠系岩块,并讨论了其构造演化。  相似文献   

第四系的正式地位和定义初步确定     

彭善池 《地层学杂志》2009,33(3)

国际地层委员会最新表决通过第四系为系级年代地层单位,它位于新近系之上,底界由意大利西西里岛的Monte San Nicola"金钉子"定义,也就是由定义格拉斯阶底界的"金钉子"来定义,年龄值约为2.59Ma;更新统的底界也下移到这个位置,格拉斯阶划归更新统,长期争论的第四系的地位和定义问题有望得到解决。  相似文献   

GeoSOT-3D椭球体剖分真三维数据表达     

孙忠秋  程承旗 《地理信息世界》2016,(3):40-46

随着地球观测技术和信息技术的进步,以全球为背景的科学探索不断增多,不仅是地球表面信息,地下、水下、空中等地球上各个层次的空间信息都受到极大的关注。地球球体剖分网格可以构建真三维的数据模型,进而实现空天地、地下水下一体化的空间数据组织、管理、表达与应用。本文详细论述了GeoSOT-3D椭球体剖分网格的剖分空间框架、剖分编码与剖分尺度特性等理论体系。建立基于GeoSOT-3D的空间对象的真三维表达模型。利用该真三维模型实现了地球椭球体的地上地下可视化,点线面体等空间实体的可视化。研究表明,GeoSOT-3D椭球体剖分具有椭球剖分框架简单、体系完整、二三维一致等特点,因而在该框架下的真三维数据模型可用于下一代地理信息系统中的空间大数据的组织管理与表达。  相似文献   

Neogene sequence stratigraphic architecture of the Nile Delta,Egypt: A micropaleontological perspective     

《Marine and Petroleum Geology》2017

The sequence stratigraphic architecture of the Neogene section from the subsurface Nile Delta is resolved based on exceptionally well-preserved microfossils from the offshore NDOB-1 borehole. The architecture is configured on bathymetry variations and statistical parameters as deduced from the relative abundance of foraminiferal associations. The statistical parameters include ratios of planktic versus benthic foraminifera, and cluster and correspondence analysis of the twelve most commonly used benthic foraminiferal genera as proxies of water depths. The combination of cluster and correspondence analysis was employed to decipher the evolution and dynamics of the basin and the mechanisms that controlled the deposition of Neogene sequences in the Nile Delta region. Four basic environmental settings were recognized: 1.) a middle to outer neritic eutrophic setting, 2.) a middle to outer neritic mesotrophic setting, 3.) an outer neritic to upper bathyal mesotrophic setting and 4.) an upper bathyal mesotrophic setting.Eight stratigraphic sequences were identified in the Neogene Nile Delta section. Three sequence in the Miocene (MSeq1, MSeq2 and MSeq3), three in the Pliocene (PSeq1, PSeq2 and PSeq3) and two in the Pleistocene (PtSeq1 and PtSeq2). These sequences are systematically measured and described in terms of time, space and water bathymetry. The sequence boundaries and flooding surfaces were dated using high-resolution microfossil biochronology and stratigraphic index markers. Individual sequences and boundaries were correlated with international and local sequence stratigraphic models. The new sequence stratigraphic model established here provides age calibrated surfaces for inter-basinal correlations and opens new avenues for hydrocarbon reservoir exploration.  相似文献   

Modeling uncertainty in the three-dimensional structural deformation and stratigraphic evolution from outcrop data: Implications for submarine channel knickpoint recognition     

《Marine and Petroleum Geology》2017

Digital outcrop models help to constrain the interactions of stratigraphic and structural heterogeneity on ancient depositional systems. This study uses a stochastic approach that incorporates stratigraphic and structural modeling to interrogate the three-dimensional morphology of deep-water channel strata outcropping on Sierra del Toro in the Magallanes Basin of Chile. This approach considers the relative contributions, and associated uncertainty, of erosional downcutting versus post-depositional structural folding and small-offset faulting on the present-day configuration of the submarine channel complexes. Paleodepositional channel-belt gradients were modeled using a combination of three-dimensional visualization, stochastic surface modeling, palinspastic restoration, and decompaction modeling that are bound with errors constrained by stratigraphic and structural uncertainty. Modeling results indicate that at least 100 m of downcutting occurs over 6 km, and the resultant thalweg gradient of 64–125 m/km (decompacted) suggests that the Cerro Toro axial channel belt is an out-of-grade depositional system. Furthermore, the presence of steeper segments (100–175 m/km decompacted) suggests the preservation of one or more knickpoints that are similar in magnitude to tectonically-induced knickpoints on the modern seafloor. The interpreted knickpoints are correlated with a decreasing channel width-depth ratio and an increase of channel depth. These results indicate that stochastic surface modeling using digital outcrop models can constrain stratigraphic interpretations and post-depositional structural heterogeneity.  相似文献   

尚未完成的地质年代表--第四纪悬而未决的前程   总被引：10，自引：4，他引：6  

安芷生  艾莉 《地层学杂志》2005,29(2):99-103

第四纪是以气候变化、人类出现和现生生物物种占优势为特征的最新地质时期。第四纪的地层多以松散沉积物为主,是人类赖以生存居住的主要场所。鉴于第四纪研究对地质学,地球系统科学和全球变化科学的贡献,近几十年来学术界和公众对其产生极大兴趣和更加重视。为了回应2 0 0 4年春国际地层委员会提出的“国际地层表”( 2 0 0 4 ) ,详细地介绍了国际第四纪联合会为争取第四纪在地质年表中的合理地位所作的努力以及目前争论的结果:今年比利时最终定论。呼吁我国广大的第四纪工作者积极加入到支持国际第四纪联合会保留第四系作为独立地层单元的行列中。同时简略地介绍了第四纪(系)术语的来由,国内外关于第四纪下限研究的历史和现状  相似文献   

CCD倾斜仪的差分式结构和电路细分方法研究     

杨江  吴林斌 《大地测量与地球动力学》2012,32(Z1):146-148

介绍通过差分式结构设计和脉冲延迟细分方法解决CCD水管倾斜仪的抗干扰能力较弱、分辨力不高等不足.  相似文献   

华北克拉通古老大陆地壳组成及演化   总被引：1，自引：1，他引：0       下载免费PDF全文

万渝生  董春艳  颉颃强  郑建平  刘守偈  马铭株  谢士稳  任鹏  孙会一  刘敦一 《中国地质调查》2015,2(3):1-4

对鞍本、冀东、鲁西、阴山等早前寒武纪典型地区和深部物质进行了深入研究,总结了华北克拉通早期地壳形成演化历史。揭示出鄂尔多斯地块本身强烈卷入了古元古代晚期构造热事件。首次在华北克拉通划分出3个>2.6 Ga古陆块。  相似文献