Magnetic interpretation of two-dimensional dikes using integration-nomograms

The magnetic anomaly caused by a buried dike is separated into its even and odd components, which have a simple symmetry with respect to the origin. These values are integrated up to the half-maximum abscissa for the even component, and the maximum abscissa for the odd component. The integration nomograms are generated using various values to the half-width and depth in the theoretical anomaly equations. These nomograms are used to determine the half-width and depth to the top of the dike for the field anomaly. The method also includes the determination of the index parameter (Q) and the amplitude coefficient (P). An example using theoretical data shows the effectiveness of the present method.     

Helmert型方差—协方差分量估计的通用公式

本文在概括函数模型和它的通用公式的基础上,导出了一个适用于所有平差方法的方差—协方差分量估计的通用公式,并由此给出方差分量估计的通用公式和简化的通用公式。     

THE CALCULATION AND ANALYSIS OF SLOPE NET RADIATION IN CHINA*

By using the climatological calculating method for each component of slope surface net radiation proposed by the authors,calculations and analyses are done of the distribution features of slope net radiation in China with emphasis on the discussion of variations of slope net radiation in typical stations and sites with slope direction,slope,latitude and season.The distribution features of net radiation on the north and south slopes are,for the first time,mapped and discussed,revealing the great difference on the national basis,and thus acquiringa new interesting result that the negative-value area of winter net radiation on the north slope(20°)can reach Yunnan and Guizhou Provinces and middle and upper reaches of the Changjiang River.     

Application of principal component analysis to understand variability of rainfall

The usefulness of principal component analysis for understanding the temporal variability of monsoon rainfall is studied. Monthly rainfall data of Karnataka, spread on 50 stations for a period of 82 years have been analysed for interseasonal and interannual variabilities. A subset of the above data comprising 10 stations from the coherent west zone of Karnataka has also been investigated to bring out statistically significant interannual signals in the southwest monsoon rainfall. Conditional probabilities are proposed for a few above normal/below normal transitions. A sample prediction exercise for June–July using such a transition probability has been found to be successful.     

硅酸盐固溶体矿物中组分的非韵律型空间分布及其形成过程的动力学机制

本文探讨了固溶体矿物中组分非韵律型空间分布的两种局域平衡结晶动力学模型: (1) 当固相中无扩散,而熔体中完全混合时,结晶作用满足如下模型: dx/ed=(x-f)/(1-e) (2) 当固相中无扩散,而熔体中仅有扩散时,结晶作用满足如下模型:提出了非韵律型组分空间分布的成因主要归因子岩浆的非平衡结晶和结晶过程中的动力学行为。     

基于AutoCAD的城市部件普查数据处理系统研究与应用

介绍了基于C#语言,用AutoCAD的.NET API进行插件开发的相关技术。并以城市部件普查项目为例,阐述了在AutoCAD二次开发中的AutoCAD数据库技术、交互界面技术、数据通信技术、自动成图技术、数据输入输出技术的实现方法。实践表明,用C#进行AutoCAD的二次开发,不仅方法容易掌握,实用性强,还可以根据实际需求,快速实现功能定制,极大地提高了工作效率。     

数字城管部件数据库艺术化表达技术研究

数字城管部件在城市管理应用中是一种专业性极强而又抽象的符号,对非专业人员来说很难辨别不同类型的部件符号,也给数字城市的管理带来许多不便。针对这种现状,本文提出了数字城管基础部件的艺术化表达技术研究,将对城市中的专业部件符号进行后期加工处理,采取特殊手段进行美化,使它看起来不仅形象美观,而且蕴藏着丰富的信息量,普通用户也可方便使用。这将在数字城管建设中发挥强大的作用,并且有力推动地理信息技术在智慧城市中的应用。     

面向移动测量系统的城市部件采集快速入库技术

为提高城市部件采集入库的效率和精度,本文针对移动测量系统采集数据的特点,提出了一种城市部件批量赋值的快速入库方法。通过构建字典编码和元数据系统表,实现了城市部件图层的批量生成;通过字典域-字典项结构树和要素属性拷贝,实现了部件属性的批量录入。试验结果证明,批量赋值快速入库方法既可提高部件入库的效率,又可保证部件入库的精度。     

基于ETM+影像的绿地信息提取方法研究

文中以ETM+影像为数据源实现对贵阳市某城区的绿地信息提取。对获取的影像进行预处理,分别通过不同的方法:原始波段组合法、主成分分析法(PCA)、独立分量分析法(ICA)、归一化植被指数法(NDVI)及基于第一独立分量的实验室波段组合法,获取研究区的假彩色合成影像。将以上方法得到的影像数据进行对比分析,表明植被景观目视效果最好的是原始波段组合法。将得到的影像数据进行监督分类,通过目视解译的方法进行精度评价,结果表明,基于第一独立分量的实验室波段组合法绿地信息提取精度最高,是一种有效的绿地信息提取方法。     

一种高效的城市部件普查方法

数字化城市管理是经济建设及信息化发展的迫切需求,城市部件普查是将物化的城市管理对象转化成数字化的管理信息,是数字化城市管理的基础。以威海市城市部件普查项目为例,通过分析城市部件的普查需求,采用GPS-RTK测量与移动设备调绘相结合的数据采集方法,以及"粗确权"、"分类别"、"分区域"的部件属性信息调查方法,构建相应的城市部件普查技术体系。基于该体系进行图形数据与属性信息的城管数据库搭建,构建一种高效城市部件普查技术方法。