Identification of GIS Attribute Error Using Exploratory Data Analysis*

Exploratory data analysis (EDA), a data-centered, inductive approach to statistical analysis, provides effective tools for assessing the quality and integrity of GIS attribute data. This research presents selected examples demonstrating EDA distribution analyses, correlational statistics, and proximity analysis. An integrated modular software prototype to operationalize these techniques combines the mapping and display capabilities of ArcView with the statistical functionality of STATA in a MS-Windows multi-tasking, multiple-windowed environment.     

频率域电磁测深资料处理软件包

本文利用混合语言编程技术,设计编制了频率域电磁测深资料处理程序包,描述了程序各功能模块的基本功能,给出了利用该软件包对实际数据处理的例子。     

Reactive transport model of silicification at the Mount Isa copper deposit, Australia

A distinct feature of the world-class Mount Isa copper system is the presence of a massive silica body enveloping the chalcopyrite ore body in the Urquhart shale. Because silicification may be genetically linked to the copper mineralization, it is important to understand its formation. It can be shown by numerical simulations of reactive transport processes that both hydraulic head and buoyancy driven flow are capable of generating silicification patterns similar to the field example. Considering the physical conditions required to form the observed patterns we suggest, however, that head-driven flow rather than free thermal convection produced the silica body. Free convection requires very special conditions and only one of several possible scenarios reproduces the observed silicification whereas any of the tested forced flux scenario is capable of doing so.     

VC++调用Matlab实现三维欧拉反褶积运算

磁性地质界面的反演是地球物理勘探的重要方法之一。这里介绍了在V isual C 6.0调用Matlab engine的详细步骤,实现了以VC为主界面,调用Matlab反演磁性界面的三维欧拉算法,并应用到不同延深的单体模型和多体模型实验中。结果表明,程序的开发周期和工作量大为缩短,复杂分布的磁性体也可用该方法确定水平位置和深度。该程序为开发地球物理分析软件提供了一条高可靠性、低开发周期的有效途径。     

我国进行激光测月的研究

概述了全球激光测月的现状,分析了其困难和改进方法及我国开展激光测月的意义,提出了对我国开展激光测月工作的建议。     

Excel VBA数据处理软件开发

ExcelVBA编程通过对Excel自身功能的集成和扩展可以较为快捷地形成一个完整的数据处理软件。本文以地下流体数据处理软件开发为实例,简要论述了ExcelVBA开发数据处理软件的思路、方法和技术要点,同时还列举了一些通用代码供大家参考和使用。     

新疆地震局局域网用户的计算机和网络安全误区

随着计算机和网络的迅速发展，计算机和网络用户日益普及，广大计算机和网络用户随时关注着计算机和网络的安全问题，这也是网络维护人员和网络用户面临的新的挑战。本文主要对新疆地震局局域网用户在计算机和网络安全方面的认识和安全防范措施进行探讨。     

REVIEWS OF GEOGRAPHIC SOFTWARE

Geographic Software Reviewed in this article: ATLAS AMP. CONTUR GOLDEN SOFTWARE MAPPING PACKAGE SAMP. G. Nigel Gilbert     

Convective Profile Constants Revisited

This paper examines the interpolation betweenBusinger–Dyer (Kansas-type) formulae,_u = (1 -1 6 )^-1/4 and_t = (1 - 16 )^-1/2, and free convection forms. Based on matching constraints, the constants, a_u and a_t, in the convective flux-gradient relations, _u = (1 - a_u )^-1/3 and _t = (1 - a_t )^-1/3, are determined. It isshown that a_u and a_t cannot be completely independent if convective forms are blended with theKansas formulae. In other words, these relationships already carryinformation about a_u and a_t. This follows because the Kansas relations cover a wide stability range (up to = - 2), which includes a lower part of the convective sublayer (about 0.1 < - < 2). Thus, there is a subrange where both Kansas and convective formulae are valid. Matching Kansas formulae and free convection relations within thesubrange 0.1 < - < 2 and independently smoothing ofthe blending function are used to determine a_u and a_t. The values a_u = 10 for velocity and a_t = 34for scalars (temperature and humidity) give a good fit. This new approacheliminates the need for additional independent model constants and yields a`smooth' blending between Kansas and free-convection profileforms in the COARE bulk algorithm.