A strategy for raster-based geocomputation under different parallel computing platforms

The demand for parallel geocomputation based on raster data is constantly increasing with the increase of the volume of raster data for applications and the complexity of geocomputation processing. The difficulty of parallel programming and the poor portability of parallel programs between different parallel computing platforms greatly limit the development and application of parallel raster-based geocomputation algorithms. A strategy that hides the parallel details from the developer of raster-based geocomputation algorithms provides a promising way towards solving this problem. However, existing parallel raster-based libraries cannot solve the problem of the poor portability of parallel programs. This paper presents such a strategy to overcome the poor portability, along with a set of parallel raster-based geocomputation operators (PaRGO) designed and implemented under this strategy. The developed operators are compatible with three popular types of parallel computing platforms: graphics processing unit supported by compute unified device architecture, Beowulf cluster supported by message passing interface (MPI), and symmetrical multiprocessing cluster supported by MPI and open multiprocessing, which make the details of the parallel programming and the parallel hardware architecture transparent to users. By using PaRGO in a style similar to sequential program coding, geocomputation developers can quickly develop parallel raster-based geocomputation algorithms compatible with three popular parallel computing platforms. Practical applications in implementing two algorithms for digital terrain analysis show the effectiveness of PaRGO.     

南黄海盆地北凹多幕正反转构造特征及其动力学分析

利用重处理的二维地震测线对南黄海盆地北凹进行了精细的构造解释,揭示了三种不同类型的正反转构造样式,分别是中南部的逆冲型、东部的压扭型和北部的褶皱型,主要受控于其所处的不同构造位置。通过典型地震测线的平衡剖面分析,并结合区域构造动力学背景分析,认为北凹至少发生了三幕构造正反转,主要受控于不同地质时期太平洋板块对欧亚大陆俯冲速度和角度的改变。其中,三垛组沉积之后,太平洋板块俯冲角度逐步由北西向转为南西西向,并且俯冲速度明显增大,使得北凹处于北东南西向挤压环境中,广泛发育正反转构造,这也是最强烈的一幕正反转,表现为强烈的逆断层活动和地层剥蚀。过度的正反转作用可能对北凹油气藏的形成造成了不利的影响。     

基于[-1，1]线性变换算子的多指标灰色关联决策模型在工程项目评标中的应用

建立了多指标灰色关联度工程项目评标决策模型。实际算例计算结果表明,该模型物理意义明确,与评标思维过程一致,比灰色关联投影法具有更高的分辩程度,有利于实际评标的操作。     

奇异摄动系统的有限频段正实引理和界实引理

利用GKYP引理研究了奇异摄动系统的有限频段正实引理和界实引理,证明了全阶系统的有限频段正实性可以由快、慢子系统的有限频段正实性得到,同样可以证明奇异摄动系统的有限频段界实引理具有类似性质.最后作为应用,给出了一个两频域尺度模型降阶实现方案,表明了该方法的有效性.     

油气田中油气的分异作用——以塔里木盆地牙哈凝析油气田为例

塔里木盆地牙哈油气田是我国迄今发现的最大的凝析油气田,由12个油气藏组成,油气分布具有“西油东气”、“上气下油”、“上轻下重”的特征,这种特征的形成,是油气自西北分两个高峰期注入和在重力作用下分异的结果,呈现了“中部注入的正向差异聚集”的模式。这种模式与Gussow和Schowalter所建立的模式在形成机制或油气分布方面有所不同。     

The anomalous variation of the lightning activity in southern China during the 1997/98 El Ni(n~)o event

This paper presents the EOF analysis results of the lightning density (LD) anomalies for the different seasons in southeastern China and Indochina Peninsula by using the OTD/LIS database (June 1995 to Feb. 2003) of the global LD with 2.5°×2.5° resolution offered by Global Hydrology Resource Center. It is shown that the LD positive anomalies in the region occurred at the same time of NINO3 SSTA steep increase in the spring of 1997 and remained to be a higher level till the next spring, as well the corresponding anomaly percent maximum in different seasons was 89%, 30%, 45%, 498% and 55% successively from the beginning to the end of the 1997/98 El Ni(~n)o event (ENSO). The centre of the LD positive anomalies for the spring or winter season is located at southeastern China and the adjacent coastal areas, but it for the summer or autumn season is located at the southern Indochina Peninsula and Gulf of Thailand, whose position for each season in the ENSO as contrasted with the normal years has a westward shift, and especially for winter or spring season a northward shift at the same time. In addition, an analysis of the interannual variations in the LD anomaly percent, convective precipitation and H-CAPE days in southern China shows that each among the three anomaly percents is correlative with the other for the positive anomaly zone and Kuroshio area. The relative variation of LD during the El Ni (~n)o period is the highest among the three rates and is larger than that during the non-El Ni(~n)o period, meaning that the response of lightning activities to the ENSO is the most sensitive in both areas. But the response of lightning activities and precipitation to the ENSO appears to be more complex and diversified either in Kuroshio area or in the Qinghai-Tibet Plateau and northwestern and northeastern China.     

遥感图像边缘提取研究

本文在全面剖析基本遥感图像处理方法的基础上 ,提出了遥感图像边缘提取研究应重点考虑的几个因素。系统归纳了几种遥感图像边缘提取方法的特点 ,并结合实例分析了秘鲁 (Peru)NearNasca地区岩浆岩山脉边缘的提取。     

地理国情监测数据自动化检查研究与实现

目前,地理国情监测数据质量检查主要以人工和简单的人机交互检查为主,效率低下、检查程序不规范,因此,本文提出地理国情监测数据自动化检查解决方法,采用面向对象的软件开发方法,进行了地理国情监测数据自动化检查系统的体系结构与功能模块设计,并对数据管理模块、自动化检查模块和结果管理模块三大功能模块进行详细设计,实现了数据模版、算子库、质检方案库等自动化检查系统关键技术。已在2017年基础性地理国情监测辽宁省任务区等多个项目中得到成功应用。