VB在基于AutoCAD的数字测图系统开发中的应用

本文通过具体的几个实例较详细地介绍了如何应用VB开发基于AutoCAD的数字测图系统 ,说明利用VB开发AutoCAD要比用其它方法简单、方便 ,且能实现功能较强的数字测图系统。     

DEM matching for bias compensation of rigorous pushbroom sensor models

DEM matching is a technique to match two surfaces or two DEMs, at different reference frames. It was originally proposed to replace the need of ground control points for absolute orientation of perspective images. This paper examines DEM matching for precise mapping of pushbroom images without ground control points. We proved that DEM matching based on 3D similarity transformation can be used when model errors are only on the platform’s position and attitude biases. We also proposed how to estimate bias errors and how to update rigorous pushbroom sensor models from DEM matching results. We used a SPOT-5 stereo pair at ground sampling distance of 2.5 m and a reference DEM dataset at grid spacing of 30 m and showed that rigorous pushbroom models with accuracy better than twice of the ground sampling distance both in image and object space have been achieved through DEM matching. We showed further that DEM matching based on 3D similarity transformation may not work for pushbroom images with drift or drift rate errors. We discussed the effects of DEM outliers on DEM matching and automated removal of outliers. The major contribution of this paper is that we validate DEM matching, theoretically and experimentally, for estimating position and attitude biases and for establishing rigorous sensor models for pushbroom images.     

Surfer Automation技术在长井段油藏描述中的应用

Automation技术是一种新型的数据访问技术,它提供了一种不同模块之间相互操作的方法。Surfer Automation是基于Surfer软件的Automation技术,可以实现Surfer面向对象编程语言的二次开发。这里以柴达木盆地尕斯库勒油田上盘为例,运用Surfer Automation技术及其与VB编程语言的接口,结合地质认识进行参数调整,选取合理的数学方法,批量自动化建立了各种用于油藏描述的地质模型,提高了长井段油藏的建模效率,且避免了一些人为因素导致的误差,为油藏精细描述带来了便利。     

基于Mapinfo的图形扩展类

本文介绍了一种基于OLE Automation的Mapinfo扩展类，文中对该扩展类的构造原理、构造方法和使用方法作了详细的讨论。     

以VC~(++)为工具的GIS集成二次开发的方法探讨

文章立足地理信息系统的开放性和可重要性 ,综合运用面向对象的程序设计方法和OLEAutomation技术 ,探讨了GIS集成二次开发的方法、途径以及实施步骤 ,并结合实例进行了具体分析。     

Automatic detection of a one dimensional ranging pole for robust external camera calibration in mobile mapping

A mobile mapping system (MMS) is the answer of the geoinformation community to the exponentially growing demand for various geospatial data with increasingly higher accuracies, captured by multiple sensors. As the mobile mapping technology is pushed to explore its use for various applications on water, rail, or road, the need emerges to have an external sensor calibration procedure that is portable, fast and easy to perform. This way, sensors can be mounted and demounted depending on the application requirements without the need for time consuming calibration procedures. A new methodology is presented to provide a high quality external calibration of cameras which is automatic, robust and fool proof. The method uses a portable, standard ranging pole which needs to be positioned on a known ground control point. While the literature focuses on solving the absolute orientation problem of the calibration, an automatic method to detect the calibration object is missing. Here, we present a mutual information based image registration technique for automatic sub-pixel localization of the ranging pole under realistic outdoor conditions. We include several robust error detection rules to allow the calibration to run without human intervention, giving as little outliers as possible, to ensure a correct calibration. Several tests are performed under various lighting and noise conditions which prove the methodology’s robustness.     

国土资源部机关办公自动化系统建设和应用

国土资源部机关办公自动化系统基本实现了部机关办公业务的电子化、网络化。本文简要介绍了该系统的建设过程、设计原则、系统结构及系统功能,同时提出了在建设和应用过程中的一些体会。     

煤矿自动化控制系统的雷电安全防护策略

从对直击雷的防护以及煤矿电源系统、监控系统雷电安全防护等方面,介绍了煤矿综合自动化监控系统雷电防护措施,并介绍了煤矿综合自动化监控系统的等电位连接和静电防护措施,以及系统的接地要求。     

基于Surfer Automation接口的气象等值线图的绘制

气象等值线图是由许多离散的站点数据经过网格点插值,再通过逐个网格判断来绘制等值线,加上颜色渲染而生成的图形。通过研究Surfer软件提供的Automation接口,用VB编程实现快速绘制出各种气象等值线图,可自定义绘制并可实时修改图层属性,定制出形式多样的等值线图,实现了Surfer功能的完美封装。