国土资源大数据上云高效运行体系及关键技术研究——以山东省为例          下载免费PDF全文

安国强  仲阳  吴建廷  孔维剑  秦晓敏  许霄霄  陈龙飞 《山东国土资源》2020,36(7):74-80

基于山东省国土资源大数据上云系统建设和应用实践,在仿真实验的基础上,研究提高山东省国土资源大数据上云效率的运行体系和关键技术,为全省政务云建设提供参考。研究结果表明,通过高效运行体系构建和关键技术的应用,山东省国土资源上云系统快速显示、裁切、瓦片、数据挖掘等效率都得到不同程度的提高,其中上云系统并发性能耗时平均提速99.5%以上,矢量数据裁图效率同比提升17倍。研究结论:从功能设计、数据组织、硬件环境和拓扑结构四个方面统筹设计国土资源大数据上云系统高效运行体系,从数据处理、异构数据集成、分布式数据存储及挖掘、海量图库管理、灵活的搭建式开发等关键技术创新,可以大幅提高国土资源大数据上云运行效率。  相似文献   

On the onset of convection in rotating spherical shells     

K.-K. Zhang  F. H. Busse 《地球物理与天体物理流体动力学》2013,107(3):119-147

Abstract

The linear problem of the onset of convection in rotating spherical shells is analysed numerically in dependence on the Prandtl number. The radius ratio η=r _i/r _o of the inner and outer radii is generally assumed to be 0.4. But other values of η are also considered. The goal of the analysis has been the clarification of the transition between modes drifting in the retrograde azimuthal direction in the low Taylor number regime and modes traveling in the prograde direction at high Taylor numbers. It is shown that for a given value m of the azimuthal wavenumber a single mode describes the onset of convection of fluids of moderate or high Prandtl number. At low Prandtl numbers, however, three different modes for a given m may describe the onset of convection in dependence on the Taylor number. The characteristic properties of the modes are described and the singularities leading to the separation with decreasing Prandtl number are elucidated. Related results for the problem of finite amplitude convection are also reported.  相似文献   

A comparative analysis of kinematic dynamo models using perturbation theory     

Yu. A. Brodsky 《地球物理与天体物理流体动力学》2013,107(3-4):223-255

Abstract

By using perturbation methods an analytical study has been carried out of large-scale dynamo models, which previously were mainly investigated by numerical methods.  相似文献   

Patterned ground formation and penetrative convection in porous media     

J. H. George  R. D. Gunn  B. Straughan 《地球物理与天体物理流体动力学》2013,107(3):135-158

Abstract

A theoretical explanation is advanced consisting of a five stage process for the formation of polygonal ground which consists of stone borders forming regular hexagons and soil centres. One of these stages, namely the onset of convection in a porous soil between temperatures of 0°C and approximately 4-6°C, is studied analytically. Darcy's law is employed but variable permeability is allowed for and a parabolic density dependence on temperature is assumed. It is found that the theoretical predictions of the aspect ratio agree very well with field studies when a constant upper surface heat flux condition is imposed and an upwardly stratified permeability is chosen. Field study data, which agree very well with the theory, are reported in detail.  相似文献   

"数字衡阳"市县一体化大数据与地理信息公共服务云平台建设的技术创新     

张淑玲 《测绘通报》2019,(9):112-114

“数字衡阳”市县一体化大数据与地理信息公共服务云平台建设项目，实现了市县地理信息一体化管理、共享和协同服务，制定了完整的市县一体化标准体系，创新了基础地理信息数据生产和管理机制，创建了基于标准体系的“一键成图”技术。大幅提升了地理信息共享应用的效益，降低了县级地理信息应用技术门槛，为全国其他地区数字城市建设提供了可借鉴、推广的经验。今后将进一步实现数据成果在各行各业的快速应用，产生更好的经济效益和社会效益。  相似文献   

机载LiDAR在高精度滩涂DEM制作中的关键技术分析     

文学东  李俊峰  林昀 《测绘通报》2019,(6):92-95

机载LiDAR可快速获取高密度的地表三维几何信息，具有全天候、主动观测、对地物间缝隙有一定穿透性等优点，在滩涂测绘中具有很大优势。本文对宁波市激光雷达滩涂测绘工作进行了经验总结，首先介绍机载LiDAR技术在滩涂测绘中的优势，然后在LiDAR数据处理基础上，重点分析高精度滩涂DEM制作的关键技术，最后对DEM产品进行精度评定。  相似文献   

智慧规划下的协同编制信息资源平台研究     

黎栋梁  陈行 《测绘通报》2019,(1):149-154

新兴技术的飞速发展不断改变着规划信息化的应用场景和模式，城市规划需要在工作模式、技术手段与组织方法等多方面进行信息化革新，才能适应城市化转型要求。本文通过对智慧规划的论述和大数据对规划方法影响的分析，并结合广州在总体规划协同编制的信息化实践，提出了时空信息聚合、实时汇聚、智能共享的信息协同解决方案，实现了规划师之间、部门之间的纵向及横向协同，不同层级规划的紧密衔接，汇集多来源、各阶段的工作成果，建设规划编制信息的资源池。  相似文献   

Multicriteria assessment of water dynamics reveals subcatchment variability in a seemingly homogeneous tropical cloud forest catchment          下载免费PDF全文

Edison Timbe  Jan Feyen  Luis Timbe  Patricio Crespo  Rolando Célleri  David Windhorst  Hans‐Georg Frede  Lutz Breuer 《水文研究》2017,31(7):1456-1468

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Transitions to chaotic thermal convection in a rapidly rotating spherical fluid shell     

Zi-Ping Sun  Gerald Schubert  Gary A. Glatzmaier 《地球物理与天体物理流体动力学》2013,107(1-4):95-131

Abstract

Numerical simulations of thermal convection in a rapidly rotating spherical fluid shell heated from below and within have been carried out with a nonlinear, three-dimensional, time-dependent pseudospectral code. The investigated phenomena include the sequence of transitions to chaos and the differential mean zonal rotation. At the fixed Taylor number T _a =10⁶ and Prandtl number Pr=1 and with increasing Rayleigh number R, convection undergoes a series of bifurcations from onset of steadily propagating motions SP at R=R _c = 13050, to a periodic state P, and thence to a quasi-periodic state QP and a non-periodic or chaotic state NP. Examples of SP, P, QP, and NP solutions are obtained at R = 1.3R _c , R = 1.7 R _c , R = 2R _c , and R = 5 R _c , respectively. In the SP state, convection rolls propagate at a constant longitudinal phase velocity that is slower than that obtained from the linear calculation at the onset of instability. The P state, characterized by a single frequency and its harmonics, has a two-layer cellular structure in radius. Convection rolls near the upper and lower surfaces of the spherical shell both propagate in a prograde sense with respect to the rotation of the reference frame. The outer convection rolls propagate faster than those near the inner shell. The physical mechanism responsible for the time-periodic oscillations is the differential shear of the convection cells due to the mean zonal flow. Meridional transport of zonal momentum by the convection cells in turn supports the mean zonal differential rotation. In the QP state, the longitudinal wave number m of the convection pattern oscillates among m = 3,4,5, and 6; the convection pattern near the outer shell has larger m than that near the inner shell. Radial motions are very weak in the polar regions. The convection pattern also shifts in m for the NP state at R = 5R _c , whose power spectrum is characterized by broadened peaks and broadband background noise. The convection pattern near the outer shell propagates prograde, while the pattern near the inner shell propagates retrograde with respect to the basic rotation. Convection cells exist in polar regions. There is a large variation in the vigor of individual convection cells. An example of a more vigorously convecting chaotic state is obtained at R = 50R _c . At this Rayleigh number some of the convection rolls have axes perpendicular to the axis of the basic rotation, indicating a partial relaxation of the rotational constraint. There are strong convective motions in the polar regions. The longitudinally averaged mean zonal flow has an equatorial superrotation and a high latitude subrotation for all cases except R = 50R _c , at this highest Rayleigh number, the mean zonal flow pattern is completely reversed, opposite to the solar differential rotation pattern.  相似文献   

南桑威奇俯冲带大地水准面异常及其地幔对流特征分析     

刘心哲  陈文文  邢军辉  吴晓阳  安隆  张浩  彭树聪 《海洋科学》2019,43(9):54-63

以南桑威奇俯冲带为例,根据EGM2008超高阶地球重力场模型、卫星重力数据为基础,利用移去-恢复原理计算了研究区大地水准面,实现了研究区不同场源深度大地水准面异常信息的分离,根据Runcorn模型计算了研究区小尺度地幔对流应力场,并结合天然地震空间展布和前人研究成果,对俯冲带结构特征与地幔对流模式进行了探讨。结果表明:南桑威奇俯冲带具有俯冲倾角较大、地震震级较低、弧前侵蚀明显等典型的马里亚纳型俯冲带特征,俯冲带南北部俯冲深度存在明显差异,中段偏北俯冲深度可达500 km;受到软流圈与上地幔上部物质密度差异的控制,东斯科舍海脊下存在沿海脊轴向南流动强地幔流;俯冲带结构与小尺度地幔对流应力场具有很强的相关性。本研究对于搞清南桑威奇俯冲带深部构造特征,理解俯冲运动、地幔对流方向及其动力控制机制提供了新的研究思路和方法。  相似文献