计算机技术(CGIS)在地质报告中的应用

CGIS数字地质报告编制软件最大、最重要的功能就是根据原始数据(如钻探资料、测量、测井和观测点数据)自动或者人机交互生成相关地质图形的功能,以及对图形的动态修改功能。自动成图功能大大缩短了地质图件的成图周期。     

数字区域地质调查前期PRB过程资料录入方法——以1∶25万江爱达日那幅为例

本文对数字区域地质调查前期PRB过程中收集到的测区各种资料的录入方法做了全面分析，系统地阐述了如何将各种收集资料数字化，录入RGMAP系统，并整合在统一空间上，为其后数字区域地质调查PRB过程作准备。     

两种大面阵航空摄影测量数字相机的误差分析

本文首先介绍航空摄影测量数字相机相对于传统的胶片相机所具有的优点，然后重点分析了市场上最新流行的两种大面阵航空摄影测量数字相机的等效中心投影像片的形成方法及其测量精度。实验分析表明：航空摄影测量数字相机系统用于平坦地区作业时能获得较高的精度，但用于山区作业时，作业精度明显下降，因此在地形起伏较大的地区，若作业精度要求较高，则应谨慎使用这两种数字相机。     

地理信息数字水印技术的实现

数字水印技术在测绘领域的应用是地理信息安全保密的重要手段。本文在对地理信息数据特征有效分析的基础上，结合不同地理信息产品的数据格式特征，阐述了利用数字水印技术建立相应的数字水印嵌入、提取理论模型的技术和实现方法。     

地图的按需印刷和复制

文中论述了按需印刷和复制的概念、应用特点及与传统印刷方式相比的优点。数字印刷是地图按需印刷和复制的技术基础，文中分析了其成像方法和设备情况。指出了地图按需印刷和复制的技术途径及技术难点。     

一种抗数据压缩的矢量地图数据数字水印算法

基于矢量地图数据特点,提出了一种抗数据压缩的矢量地图数据数字水印算法,即在嵌入水印信息之前对数据进行道格拉斯-普克法压缩,然后在特征点中嵌入水印信息。实验分析表明,提出的水印算法在抗数据压缩方面具有较好的效果。     

基于图像方向性信息测度的图像水印技术

数字水印是图像信息版权保护的一种新兴的技术手段,水印的不可感知性和鲁棒性是相互制约的两个对立面。结合人类的视觉系统特性,提出了一个新的图像水印方案基于图像方向性信息测度的图像水印,在水印嵌入时根据图像块的局部特性,自适应地调整水印的嵌入强度,达到了在鲁棒性和不可感知性之间的较好折衷。最后结合实例说明了算法的实用性。     

如何评价电子水准仪的质量与性能

本文探讨了评价电子水准仪时应考虑的几个主要方面及检测时应注意的问题,并提出了“综合评价”电子水准仪的简便方法。     

Photogrammetric Solutions for Industrial Automation and Process Control

Digital photogrammetric systems have been introduced to solve various measurement problems in industrial applications for many years, ever since high resolution CCD cameras and powerful computer technologies have been available. For a successful implementation of a digital photogrammetric system into the production line, not only does the actual measurement task have to be solved but also a complete integration of the system into the production process usually has to be supplied by the system manufacturer. Three examples of successful implementations of photogrammetric systems for industrial automation and process control are presented in this paper.     

Practical Influences of Geometric and Radiometric Image Quality Provided By Different Digital Camera Systems

Imaging systems founded on current digital camera technology are finding widespread use in high precision measurement applications. A single digital CCD camera, or an array of such cameras, equipped with ring lighting equipment is commonly used to acquire imagery of high contrast retroreflective targets placed on the object at discrete locations to signalize points of interest. The precise and accurate measurement of each imaged target location is a fundamental requirement if suitable measurement tolerances are to be obtained. Whilst such systems are undoubtedly capable of producing excellent results, the practical effects of target image quality on the photogrammetric measurement process is in need of careful consideration. This paper revisits some fundamentals of the optical imaging of retrotargets and investigates some abilities of a range of digital camera systems to provide images of retrotargets that are appropriate to the measurement process. Some experimental results are presented including the imaging of planar arrays of differing sized retrotargets at differing angles and exposures and a series of network analyses in which the level of target image intensity has been varied systematically.