景观格局在地理国情综合统计中的应用研究

在地理国情综合统计分析的研究中,利用景观格局能够进行生态协调性和地表覆盖景观格局分析。在景观格局分析中,常用的方法是景观格局指数。本文对景观格局指数在黑龙江省地理国情普查的两个实验区的应用进行了研究与分析。     

三维激光扫描技术下的规划验收测量数据处理及成果获取

三维激光扫描技术由于可快速获取高精度、高密度点云数据,可将拟验收建筑及周边情况几乎完全无差地复制到电脑中,是规划验收测量特别是复杂建筑规划验收测量的理想方法,但是其数据处理一直是影响甚至制约其应用的瓶颈。本文简述了规划验收测量要点,以及三维激光扫描点云数据初步处理流程,并针对制作规划验收测量各类图件的不同需求,提出了分别通过直接取线、切片、投影等方法制作成果图件的工作思路及各方法的特点。但是还需研究和解决海量点云的数据处理,以及根据验收测量特点获得测量成果图件的问题。     

基于地理国情数据的长江岸线保护和开发利用情况分析

本文基于地理国情数据,从农业垦殖、开发建设、生态修复情况三个方面出发,对长江岸线1 km范围内的保护和开发利用情况进行空间统计分析。通过分析可知:(1)2015~2018年,长江岸线农业垦殖和开发建设力度有所增强;(2)2015~2018年,长江岸线生态修复取得一定的进展,但仍需持续推进。     

The GPS Toolbox

The GPS Toolbox is dedicated to highlighting algorithms utilized by GPS engineers and scientists. If you have an interesting algorithm you would like to share with our readers or if you have a topic you would like to see covered in a future column, contact us at gps-toolbox@ngs.noaa.gov. To comment on the algorithms presented here, or to leave a request for an algorithm you may be looking for, visit our Web site (http://www.ngs.noaa.gov/gps-toolbox). ? 2000 John Wiley & Sons, Inc.     

DGPS and RTK Positioning Using the Internet

The Internet as a basis for Real-Time Kinematic (RTK) and differential Global Positioning System (DGPS) service provides many advantages for worldwide GPS users. Among these advantages are service unification, open architecture, bidirectional communication, and scalability. The current development of this service allows users to use RTK and DGPS through the Internet with conventional accuracy over the short and medium baselines. The perspective for this service lies in the field of wide-area augmentation systems (WASS). At this stage of the Internet-based RTK and DGPS service project, the general concept, system components, draft standards, and software are developed. ? 2000 John Wiley & Sons, Inc.     

电子政务建设应注意军事应用的几个问题

电子政务的运行模式必将促使国防动员、军队决策指挥 ,以及战场信息应用等环节发生相应的变化。建设电子政务将促进国防动员工作规范化、制度化 ,将创造条件实现政府对军队的信息支援 ,将有利于未来战争数字战场环境建设。建设电子政务系统和“数字城市”、“数字省区”时 ,应结合国防动员和信息支援的问题从顶层构架 ,统盘考虑军事应用 ,同时制定法规和标准     

3维城市建筑物模型数据采集的质量控制

在给出３维城市建筑物模型采休准则和质量的基础上,介绍利用了ＧＩＳ系统进行数据质量检查的基本过程和作业方法。     

Determination of failure probabilities of flood defence systems with improved dynamic bounds method

In this paper, we describe the computational framework of a novel method for solving the challenging problem of probabilistic finite elements. The method is called Improved Dynamic Bounds (IDB) and was developed recently to improve the efficiency of the dynamic bounds. The IDB is used in finite element numerical models to calculate time-dependent failure analyses of structures. In applications, the IDB can speed up the overall simulation process by several orders of magnitude. In applications controlled by two influential variables (e.g, two-dimensional problem), the computational efficiency is improved by a factor of 769 according to Rajabalinejad (2009). Applications of IDB indicate the method is most efficient for problems where the number of influential variables are limited. This is often the case for geotechnical and coastal flood defence systems. The IDB method is applied in this paper to the 17th Street Flood Wall, a component of the flood defence system (levee infra-structure) that failed during the Hurricane Katrina, to calculate the failure probability of an I-wall.     

青海祁漫塔格地区航磁异常特征及找矿前景

利用青海祁漫塔格地区1∶5万高精度航磁资料,结合成矿地质背景、构造特征分析了该区航磁异常特征,并依据知矿(床)点的分布及成矿规律对祁漫塔格地区成矿带进行了划分,筛选了一批重点找矿异常,建立了以航磁异常信息为主的综合找矿标志,进而圈定了多个多金属找矿远景区段.对该区下一步矿产勘查部署提供重要依据,并为地面找矿工作提供重要的找矿线索.