正确认识数字地形图的质量特性客观评价数字测绘产品的质量

本文试图通过对测绘及数字测绘产品质量特性的认识，引起大家对数字测绘产品质量的全面重视，并通过了解如何评价数字测绘产品的质量，以便更好地定位产品质量要求，经济、合理、科学运用数字测绘产品。     

数字测绘教学势在必行

以"3S"为代表的测绘新技术正在不断地扩大到各种工程建设中和经济生活中,应用测量学的教学内容必须引入数字测绘.随着数字测绘仪器和技术的普及,随着<数字测绘基础>教材的出版,开展数字测绘教学势在必行.     

《数字航空摄影测量测图规范第1部分：1∶500 1∶1000 1∶2000数字高程模型数字正射影像图数字线划图》制定情况说明

数字航空摄影测量法是测绘成果生产的重要方法。规定数字航空摄影测量法生产大比例尺数字测绘成果的作业方法和技术要求,对生产作业的各项技术内容进行约定和规范,有利于指导数字测绘成果生产,对保障作业质量具有重要意义。对该标准的编制原则、制定情况和主要问题作了说明。     

数字测绘成果内外业辅助检验系统开发研究

数字测绘成果已成为测绘成果的主要载体,这为借助计算机技术实现数字测绘成果检验自动化提供了基础。基于ArcGIS Engine开发数字测绘内外业辅助检验系统,实现数字测绘成果检验工作自动化,依据数字测绘成果检验的特点,介绍系统各功能模块的开发设计和系统特点。     

提高数字测绘产品质量的方法及其应用

结合1:10000基础测绘的生产实践,概述了在全数字摄影测量工作站的生产过程中如何有效地提高数字测绘产品质量的方法,并总结了生产过程中的一些经验。     

行标《数字测绘产品检查验收规定》若干问题的探讨

数字测绘产品是一种新型的测绘产品,是当今测绘技术发展的方向,随着数字测绘产品的推广与应用,其质量监督与管理越来越受到人们的重视。研究和制定适合数字测绘产品特性的检查、验收程序与要求,将有利于建立并保持一个完整的、有效的测绘产品质量监督、检验体系,从而促进数字测绘产品的发展。     

数字测绘产品的特点与技术标准

通过对“目标种类目录”实例的介绍,说明进行数字测绘产品生产要求有细致的技术准备工作,由此引发对数字测绘产品基本特点,以及目前数字测绘产品生产中与这些基本特点不相适应的若干问题与现象的讨论,并提出了针对数字测绘产品基本特点,在谋求建立数字测绘产品生产的技术标准时应重点考虑的一些问题。     

加快基础测绘步伐构建数字上饶空间数据基础框架

本文叙述了基础测绘和数字城市的重要性以及我市开展基础测绘的现状及主要目标和任务,并叙述了加快基础测绘的步伐,构建数字上饶空间数据基础框架,为建立数字城市服务。     

数字测绘产品的质量检查与质量控制

介绍了最新的数字化测绘生产技术和数字测绘产品的种类及用途,讨论了有关数字测绘产品质量检查和质量控制的一些问题。     

国家基础地理信息系统1:5万数字高程模型建成

由国家基础地理信息中心、陕西测绘局、黑龙江测绘局、四川测绘局、海南测绘局、山西省测绘局等共同完成的国家基础地理信息系统1:5万数字高     

Designing Thought,Technical Line and Some Theoretical Issues on Geospatial Digital Framework of China

Based on the developing tendency of present China‘s basic GIS,this paper discusses the designing idea for scales of 1∶10 000,1∶50 000,1∶250 000 and 1∶1 000 000 pyramidlike multilayer and multiresolution of the basic GIS.A technical line for the construction of basic GIS of the whole country and various provinces for sustainable development is put forward.And some important theoretical GIS issues touched by the technical process are discussed.     

摄影测量和数字图象处理的某些进展

本文从王之卓教授关于“数字图象处理将是摄影测量的一个新的作业领域”的观点出发,介绍了用数字图象处理的方法解决摄影测量问题方面的某些进展,主要是:快速数字微分纠正,影象增强与镶嵌,数字立体正射影象图,LANDSAT和SPOT卫星图象的参量估计与星历数据的利用。     

数字正射影像图的制作方法和应用研究

对数字正射影像图的定义及其产品的制作方法进行了详细介绍,并通过数字城市这一实例来说明正射影像图的应用.     

The Z/I Imaging Digital Camera System

Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system.     

Small Format Digital Cameras for Aerial Survey: Where Are We Now?

This paper introduces the subject of digital sensors for aerial survey by reviewing the use made of small format digital cameras in such an application. The major advantages and disadvantages of employing such consumer technology for aerial survey are highlighted. Finally, a specification is proposed for a minimum requirement for a digital solution based on a single area array sensor.     

Digital Earth in support of global change research

Abstract

The Digital Earth concept as originally proposed by former US Vice president Al Gore is now well established and widely adopted internationally. Similarly, many researchers world-wide are studying the causes, effects and impacts of Global Change. The authors commence by describing a five-step approach to the development of Digital Earth technologies. This is followed by a detailed account of Digital Earth research and developments in China. The authors then present the research results of Global Change studies carried out in China, based on the Digital Earth approach. These research results are based on a classification of global change regions. This covers the following global change situations:

Forest and grassland fires in Northern China, temperate region desertification and dust storms, underground coal fires, deforestation and carbon sequestration, protection and utilisation of wetlands, Avian Influenza and the spread of diseases, Tibet Plateau uplift and sub-tropical monsoon climate region, and sea-level rise. The research results show that the environment does not behave in a way easily understood by the traditional disciplinary approach. Although man is clearly a contributing factor to certain Global Change aspects, such as underground coal fires, desertification, land use changes etc., many of the aspects of Global Change are naturally occurring phenomena which have been changing over centuries, and will continue to do so, no matter what actions we undertake to reverse these processes. Hence, in their conclusions, the authors propose that the communities involved in Digital Earth modelling and in Global Change research co-operate closer to overcome the limitations inherent in the current ‘conventional’ scientific approach, where scientists have very much stayed within their respective scientific boundaries. Such an integrated approach will enable us to build the next level of scientific infrastructure required to understand and predict naturally occurring environmental changes, as well as that of coupled human–environmental systems.     

Designing thought,technical line and some theoretical issues on geospatial digital framework of China

Based on the developing tendency of present China's basic GIS, this paper discusses the designing idea for scales of 1∶10 000, 1∶50 000, 1∶250 000 and 1∶1 000 000 pyramidlike multi-layer and multi-resolution of the basic GIS. A technical line for the construction of basic GIS of the whole country and various provinces for sustainable development is put forward. And some important theoretical GIS issues touched by the technical process are discussed.     

用全数字摄影测量系统高效获取4D数字产品的方法

以北京某地区为例，详细介绍利用JX-4C全数字摄影测量工作站制作4D（DRG、DLG、DEM、DOM）数字产品的作业方法，最后得出该地区的4D产品成果图。证明利用该方法制作4D产品的速度快、精度高，可广泛应用于测绘生产过程。     

论数字化地理空间基础框架的建设与应用

当前国内外一个重要的发展趋势是将各种社会经济，资源环境等要素数字化，在统一的数字化地理空间基础框架（DGSF）上，实现多类型，多时相，多分辨率图形，图像，文本，视频，音频信息的有机集成，建立数字地球，数字国家，数字区域或数字城市等，本文首先回顾了我国“数字行业”，“数字省区”，“数字城市”等对DGSF的需求，然后讨论了DGSF的基本内涵，重要特性及其与国家空间数据基础设施（NSDI），基础测绘，国家基础地理信息系统等术语之间的同异，继而重点分析了今后我国DGSF建设和应用的若干方向。     

数码相机可量测化的研制

普通数码相机在图像获取方面有着很多优势，但它是非量测化相机，不能用普通数字摄影测量方法对其数字图像进行处理。针对这一情况，本文进行了数码相机的可量测化研制，并将其投入实际应用。实际应用的结果证明研制工作是成功的。