测量仪器

CH20041893基于VC++6．0实现计算机与全站仪通讯= Communicative Method of Total Station with Computer Based on Visual C++6．0／靳海亮,赵长胜,周兴东,韩奎峰(中国矿业大学环境与测绘学院)∥北京测绘．-2004(2)．-48-51 为解决测量工作中计算机与全站仪的数据通讯问题, 在VC++6．0中使用串行通讯控件ActiveX实现了计算机与全站仪的数据通讯及生成成图软件所要求的坐标展点格式文件的方法,并给出了较为详细实用的实例程序,可在此     

用VS2005开发AutoCAD Map3D2008地图数据检查程序

介绍了VC++开发AutoCAD Map 3D 2008组合环境配置以及工程属性设置,并详细说明了地图采集数据检查程序的流程和代码实现.     

恒星仿真器多串口通讯实现

主要介绍如何利用VC++6.0中的ActiveX控件MSComm,在恒星模拟器的单文档(SDI)视图下实现多串口通讯以及对接收数据的处理方法,并给出了相应的程序代码。     

道路信息管理系统的设计与实现

论述了基于传统关系数据库建立道路信息管理系统的空间数据库引擎的理论和方法,着重分析了VC++的几种数据库操纵机制,提出了一种基于DAO、ADO和ODBC建立道路信息管理系统的方法.     

虚拟现实技术的航空摄影测量地对地检校场选址研究

本文根据地对地检校场对地形条件的要求,应用虚拟现实技术,建立大范围三维地形场景,基于Open GL及VC++编程实现地对地检校场的自动选址,为地对地检校场选址提供多种解决方案。     

基于球面投影的散乱点云三维建模算法实现与效果分析

介绍基于球面投影的散乱点云三维建模算法步骤,运用VC++编程语言结合OpenGL图形接口实现该算法,并结合实例说明球面投影法相对于圆柱面投影法、椭球面投影法在三维建模中的优势.     

控制点信息表制作与填写自动化技术研究

VC中COM的]Dispatch接口可使C++程序同VBA程序进行通信,从而完成对Microsoft Word的操作.文中以航测外业控制点信息表自动制作与填写为例,提出一种面向对象的Word自动化技术.     

输电线路测量外业数据一体化管理程序设计

按照输电线路终勘测量外业采集数据处理要求,进行测量外业一体化管理程序需求分析和功能设计,利用VC++6.0开发完成了数据管理程序,提高了输电线路终勘测量外业数据处理的质量和效率,具有较强的推广应用价值。     

基于Oracle Spatial和OO4O的空间数据存取研究

介绍了用OracleSpatial对空间数据进行组织和管理的原理与方法,给出了在VC++6.0环境下用OO4O读取OracleSpatial空间数据的编程方法,为基于OracleSpatial的GIS应用系统开发带来了新的解决思路和研究方向。     

电子地图集的自动分幅设计与实现

分幅地图是电子地图集设计中的一个主要问题.根据电子地图集的特点,提出了电子地图集自动分幅设计的基本原则和方法,并在VC++环境下实现了基于MapX控件的电子地图集自动分幅.     

TEQC数据质量检查和界面开发

TEQC被广泛地应用于大地型GPS接收机的观测数据数据预处理,可以对观测数据进行转换、编辑和质量检查,因TEQC最初是面向Unix系统,使用borlandC语言开发,因其交互性差,对其界面利用VC＋＋进行开发。     

Integration and Sharing of Geo-spatial Data Based on Data Engine

Through analyzing the principle of data sharing in the database system, this paper discusses the principle and method for integrating and sharing GIS data by data engine, introduces a way to achieve the high integration and sharing of GIS data on the basis of VCT in VC , and provides the method for uniting VCT into RDBMS in order to implement a spatial database with object-oriented data model.     

复合导线粗差探测及编程实现

对附合导线测量中观测值粗差与导线闭合差的关系进行了分析,得出导线角度粗差和边长粗差的数学计算模型,然后据此在VC++6.0环境下编程实现对粗差探测的自动化计算,提高计算效率.     

基于SuperMapObjects5.0的影像数据库管理系统的设计与现实

随着遥感技术的进步和时间的推移,影像数据量飞速增加,随之而来的是庞大影像数据的管理问题.利用影像数据库系统可以高效快捷地进行数据管理.系统以SuperMap Objects 5.0为开发平台,以vC++为开发工具,构建影像数据库,实现了影像管理的自动化.系统实现之后,利用国家二调的工作对系统的功能进行了检测应用,效果良...     

基于扫描模式的点云修复技术研究

在现有3维激光扫描点云数据基础上,本文在VC＋＋平台下,对点云数据进行了处理,实现了点云数据的修复,其中数据采用美国斯坦福大学试验点云数据。经实验表明,程序能够实现点云的修复,减少了外业扫描过程中因遮挡引起的点云缺失。     

基于庞卡莱代数的TEN三维GIS模型研究

不规则四面体网具有结构简单、易于扩展的特性。借助于庞卡莱代数,应用边界表示理论重新描述了TEN模型。与传统几何结构模型相比,这种模型具有表达简单、易于计算的特点。同时,提出基于庞卡莱代数的TEN合并和删除运算以及拓扑一致性检查。在VC++环境下,对TEN模型的合并和删除运算进行编程与实现。实验表明,基于庞卡莱代数的TEN模型可以有效建立动态实体模型,能够实时建立拓扑关系,适合于表达不规则矿体等动态变化的三维实体。     

VB与VC＋＋环境下基于MapX的二次开发比较

VB、VC是基于MapX常用的GIS二次开发环境,本文以添加地图对象、加载数据集、创建标准工具栏和数据绑定等为例,比较分析了VB、VC环境下利用MapX开发的不同,得出了VC更注重程序的效率,而VB更强调易用性的概括性结论,为MapX开发平台的选择提供了有效的帮助。     

Time series analysis of vegetation-cover response to environmental factors and residential development in a dryland region

Land-use changes as a result of residential development often lead to degradation and alter vegetation cover (VC). Although these are worldwide phenomena, sufficient knowledge about anthropogenic effects caused by various populated areas in dryland ecosystems is lacking. This study explored anthropogenic development in rural areas and its effects on the conservation of protected areas in drylands, focusing on the change in VC, the reasons, extent, and the drivers of change. We propose a novel framework for exploring VC change (VCC) as a function of environmental and human-driven factors including different types of populated areas in drylands. As a case study, we used a 30-year time series of Landsat satellite images over the arid region of Israel to analyze spatiotemporal VCC. The temporal analysis involved the Contextual Mann-Kendall significance test and spatial analysis to model clustering of VCC. A Gradient Boosted Regression machine learning algorithm was applied to study the relative influence of environmental and human-driven factors on VCC. In addition, we used ANOVA to examine differences between the effects of three types of populated areas on the spatiotemporal trends of VC. The results show that the most influential environmental variable on VCC was elevation (relative contribution of 17%), followed by slope (14.8%) and distance from populated areas (14.6%). Moreover, different types of populated areas affected VC differently with varying distances from residential centroids. The nature reserves increased VC positively and significantly, while livestock settlements had a negative effect. Change in vegetation was mostly confined to the stream network and occurred in lower elevations. The study demonstrates how different land-use practices alter the landscape in terms of VC and differ in their extents, patterns, and effects. With the expected growth in population and residential development worldwide, the proposed framework may assist conservation managements and policy makers in minimizing environmental degradation in drylands.     

Urbanization effects on vegetation cover in major African cities during 2001-2017

Urbanization effects on vegetation cover (VC) have been analyzed in many regions. However, little attention has been paid to Africa, which has undergone rapid urbanization in recent decades. In this study, MODIS land cover and enhanced vegetation index (EVI) data were used to examine urbanization effects on VC in 59 large cities in Africa during 2001–2017. The ΔEVI (urban EVI minus rural EVI) was used to represent urbanization effects on VC. Major findings include: (1) for 59 cities averaged, annual ΔEVI averaged from 2015 to 2017 was -0.116. Negative annual ΔEVI (i.e. urban EVI lower than rural) were observed in 56 of 59 cities. (2) For 59 cities averaged, urban area increased 17.9% from 2001 (262.8 km²) to 2016 (309.8 km²). (3) Annual ΔEVI decreased significantly (p<0.05) in 44 of 59 cities for the period 2001–2017, and annual average area of urbanization effects on VC increased significantly in 40 of 59 cities. For 59 cities averaged, the percentage of urban area with significant decreasing trends of annual ΔEVI was 60.0%. Spatially, cities near the Gulf of Guinea showed more significant decreasing ΔEVI than cities in other regions. In addition, the trends and spatial distributions of urbanization effects on VC differed little by seasons. These results suggested that urbanization and its effects on VC in Africa should arouse more attentions.     

Quantitative assessment of vegetation cover and soil degradation factors within terrain units for planning,monitoring and assessment of renaturation along oil and gas pipelines

This paper evaluates the renaturation activities applying the quantification of vegetation cover (VC), the site suitability analysis (SSA) based on the predefined criteria (slope steepness category (SSC), soil erodibility factor (K) and VC) and soil erosion model (SEM) results within the terrain units (TUs) along pipeline rights-of-way (RoW). Quantification of VC percentage is performed to assess the overall restored VC from 2005 to 2007. The results of the quantitative analysis in 2007 show that the total area of restored VC is 10.7 km², and 8.9 km² still needs to be restored to comply with the environmental acceptance criteria. As a result of SSA, TUs were prioritized by erosion vulnerability and this allowed to better understand the landscape behaviour in regards to erosion processes. SEM provided more detailed predictions of erosion classes falling into TUs. SEM identified 40% of erosion sites occurred from 2005 to 2010.