航空数字成图相机系统简介   总被引：1，自引：0，他引：1  

朱明  薛重生 《地质科技情报》2007,26(4):111-112

航空数字成图相机系统是基于大面阵CCD的厘米级高分辨率多光谱全数字对地遥感成像系统,兼备传统航空摄影测量与现代光电子多光谱数字遥感的技术特点,已广泛应用于城市大比例尺测图、高精度环境及地质灾害监测中,在数字城市和重大工程勘测领域具有广阔的应用前景.  相似文献   

基于宗海图编绘技术规范的制图关键技术          下载免费PDF全文

林霞  王鹏  闫吉顺  于永海 《海洋开发与管理》2018,35(3):21-23

宗海图是海域使用申请审批相关材料的重要组成部分,是海域管理的基础资料。文章从工作底图、图件颜色和字体大小、坐标精度、界址点编号以及特殊项目宗海图绘制等方面对宗海图制图的关键技术进行了分析,总结了宗海图编绘技术规范与海籍调查规范的区别,主要包括:增加了宗海平面布置图、调整了用海图斑、重新规定了分宗编绘要求、增加了线划比例尺以及弧形圆形用海区域的绘制要求等,并给出了应加快制定海洋行业标准的建议。  相似文献   

三维城市精细建模的常见问题及解决方案探讨   总被引：1，自引：0，他引：1  

林莹 《现代测绘》2009,32(4):13-15

利用可视化三维地理信息平台Skyline结合三维造型软件3D MAX进行虚拟三维城市精细建模是近年来新兴的一种技术,但其数据在衔接上普遍存在一些问题.本文通过对从建模到集成全过程的细致分析,提出其常见问题及解决方案  相似文献   

A Review of Shallow-Water Mapping Systems   总被引：1，自引：0，他引：1  

Atanu Basu  N. K. Saxena 《Marine Geodesy》1999,22(4):249-257

In recent years shallow-water mapping systems have been developing rapidly for various applications of coastal, nearshore, and other shallow-water regions. Some systems can operate in only 0.5 m deep water, while the operating range of some systems is over 600 m depth. This article reviews the characteristics of nine shallow-water mapping systems developed by seven manufacturers. The design and the data collection methods of these systems are different from each other, and each has its advantage. Most of these systems have been tested in the real environment and are in use for various purposes around the world.  相似文献   

测绘运筹学动态规划简介     

龚强 《测绘与空间地理信息》1999,(2)

本文基于应用,对测绘运筹学动态规划的基本原理、逆序算法、基本概念及最优化原理等作了简要介绍。  相似文献   

《都江堰灌溉区域图》的设计与编制   总被引：1，自引：0，他引：1  

赵建英  李维庆 《四川测绘》2009,32(3):142-144

本文介绍了《都江堰灌溉区域图》的设计与编制,包括设计思路、制图工艺流程及关键技术等。通过对该图制图工艺和关键技术的总结,同时也对地图制图新技术进行了有益探索。  相似文献   

白洋工业园地形测绘     

柯于衡 《北京测绘》2009,(3):74-76

利用湖北枝江白洋工业园规划区域测区内的6个E级GPS点（平面系统为1954年北京坐标系,高程系统为国家黄海高程系统）,作为一、二级导线,图根控制测量的起算点,采用GPS拟合高程,测定142个图根控制点,测绘该区域28．201平方千米1：1000数字地形图。测绘成果精度满足规划要求。  相似文献   

海洋地球物理导航   总被引：5，自引：3，他引：2       下载免费PDF全文

彭富清  霍立业 《地球物理学进展》2007,22(3):751-759

本文分析了海洋地球物理导航在水下航行器应用研发中的重要价值,总结了地球物理导航的理论方法,指出了海洋地球物理导航中有待解决的关键技术问题及其发展方向,阐明了海洋地球物理导航与惯导系统的组合是实现实时、连续、精确、安全隐蔽、完全自主水下导航的理想途径.  相似文献   

Differences in causal reasoning about resource dynamics and consequences for the participatory debate on North Sea fisheries     

M.C. Verweij  W.L.T. van Densen 《Marine Policy》2010

Fishermen, scientists, policy makers, and staff of environmental NGOs (ENGOs) have significantly different understandings of the processes that determine developments in fish stocks. These perception differences hinder the participatory debate on why fish stocks change and which management measures are effective. In this study, differences in causal reasoning about processes between fishermen, policy makers, ENGO-staff, and scientists were examined, regarding four case studies within the management of the fishery on North Sea plaice. First, it appeared that all parties, besides scientists, had difficulty reasoning about long-term effects because of comprehension problems with stock dynamics, and because of short-term economical interests. Second, there were differences in how parties deal with natural variation and interconnectedness of natural and anthropogenic influences. Stock assessment scientists work with single-species models, reducing complexity by using assumptions that rule out variation, in order to inform policy makers about the effect of one isolated management measure. Fishermen on the other hand, relying on information from their daily lives at sea, emphasize complexity and interconnectedness, and the impact of the ever-changing and unpredictable nature. ENGO-staff appeared reluctant to reason about single species and broaden the debate to the ecosystem-level, while emphasizing the effect of man. As a consequence of the diverging perceptions, much time in multi-stakeholder settings is lost on repetitive discussions, mainly on the relative importance of 'nature' versus 'man'. No wonder that policy makers feel lost, and experience processes as very complex. Concluding, to handle these perception differences, there is need for a directive process coordinator, and a more creative informative role for fisheries scientists. Together with all participants, they should map all expectancies and lines of reasoning at the beginning of the debate. This scheme can be relied on during subsequent meetings, in which perceptions can adequately be positioned.  相似文献   

Choosing pasture maps: An assessment of pasture land classification definitions and a case study of Brazil     

《International Journal of Applied Earth Observation and Geoinformation》2020

Pasture land occupies extensive areas and is increasingly of interest for sustainable intensification, land use diversification, greenhouse gas emission mitigation, and bioenergy expansion. Accurate maps of pasture and other managed land covers are needed for monitoring, intercomparison, assessing potential uses, and planning. Yet, land maps can be generated from different types of classification datasets – i.e. as a land use or land cover type – as well as different sources. In this study our aim was to assess and compare land use and land cover definitions for pasture, and examine variability in the resulting pasture land classification maps. First, we conducted a review of pasture definitions in commonly used mapping databases. We then performed a case study involving Brazil, a dominant global producer of pasture-based livestock. Six geospatial databases were harmonized and compared to each other and to MODIS land cover for Brazil including the Cerrado and Amazon biomes, which are internationally recognized for their ecological value. Total pasture area estimates for Brazil ranged by a factor greater than four, from about 430,000 km² to over 1.7 million km². Our analysis showed high variability in pasture land maps depending on the definitions, methods and underlying datasets used to generate them. The results are illustrative of a symptomatic problem for all manage land datasets, demonstrating the need for land categories studies and geospatial data resources that fully define land terms and describe measurable management attributes. Additionally, the suitability of individual geospatial datasets for different types of land mapping must be better described and reported. These recommendations would help bring more consistency in the consideration of managed lands in research, reporting, and policy development, as demonstrated here for pasture land using six case study datasets from multiple sources.  相似文献