基于GIS／RS的西畴县法斗乡土地利用变化研究

随着科学技术的发展,遥感技术运用到土地利用管理中,能够快速提取土地利用变化信息,同时地理信息技术（GIS）迅猛发展,基于这两种技术结合起来探测土地资源的变化具有重要的现实意义。因此,在GIS平台支持下,将土地利用变化分析结果用于土地利用更新从而得到更新后的土地利用现状图。并根据土地利用面积变化、类型等方面对项目区进行了定性定量研究。根据土地利用变化情况以及土地利用各类型之间的相互转换状况,建立了土地利用类型转换矩阵并根据项目区实际情况提出了在石漠化地区生态效益恢复的建议及对策。     

面向空心村综合整治的农村土地资源配置探析

如何通过空心村综合整治实现农村土地资源的合理配置,是构建城乡发展一体化新格局所要面对和解决的重大问题。本文通过梳理空心村整治和农村土地资源配置的概念内涵,明晰了新型城镇化、乡村重构、空心村整治和农村土地资源配置之间的内在关联;根据不同空心村整治类型例证了农村土地资源配置模式,并提出面向空心村整治的农村土地资源配置的市场化及制度保障措施。结果表明：空心村整治的实质是实现以农村土地要素为载体的要素有序流动及其优化配置,乡村重构和空心村整治互为理论依据和推动途径,空心村整治和新型城镇化互为重要内容和研究背景,新型城镇化和乡村重构则互为政策推力和实现方法;对应于空心村综合整治途径,将农村土地资源配置分为城乡一体型、中心社区型和就地改良型3种模式;当前需要发挥市场对农村土地资源配置的决定性作用,重点改革土地征收制度、土地承包经营权流转制度、宅基地流转制度和农村土地退出制度,完善户籍制度、社会保障制度和税费制度,从而有效提升农村土地利用效率。     

GIS支持下的全球武装冲突数据体系建设评介

地缘环境安全是国家安全的重要组成部分。准确、精细、及时更新的各类地缘冲突信息是全球地缘风险评估和预警的基础。本文全面回顾了以武装冲突为核心的全球地缘冲突数据体系建设的发展历程,剖析了地理时空定位、大数据挖掘等技术的应用进展。在地理信息系统（GIS）技术支持下,对武装冲突内涵和武装冲突事件数据体系总体框架的理解不断深入,生产出一大批高质量的数据集合或数据产品;地缘冲突在主题上逐渐细化,冲突事件记载的空间定位精度从国家发展到更小尺度的地理位置（经纬度）;在网络信息搜索与大数据挖掘技术支持下,武装冲突信息的更新频率从年度更新提高到每小时更新,全球武装冲突数据体系建设初见成效。地缘环境系统科学与地理科学的深度融合、地理大数据与人工智能技术的广泛应用将是推动本学科领域发展的重要动力。     

磁电传感器在数字摄影测量工作站中的应用

目前国内各大测绘单位的航测内业成图软件大多数选用了全数字摄影测量工作站。磁电传感器应用于该工作站的脚踏开关系统,与以往的机械式脚踏开关系统相比,大大提高了数据采集的响应频率,成功地解决了数据采集过程中的重复采集,连点采集,漏采数据的问题。直接减轻了作业员,检验员,硬件维修人员工作量,从而大大提高了作业的效率。磁电传感器是一种非接触式传感器,它具有无触点、无开关瞬态抖动、响应频率高、低功耗、高可靠性和长寿命等特点。本文通过分析霍尔传感器件的原理,结合数字摄影测量工作站硬件设备的相关电路,给出了把霍尔传感器应用到数字摄影测量工作站脚踏开关系统中的具体方法。     

福建省海洋环境保护规划信息系统设计与实现

以福建省海洋环境保护规划的方法和步骤为基础,以系统的应用需求分析为出发点,进行海洋环境保护规划信息系统开发模式分析、系统总体结构设计、系统界面与系统功能模块实现等研究,采用组件式设计方法,用C#4.0封装了ArcEngine地图引擎,实现海洋环境信息采集、存储、管理、分析和图形处理,以及查询、分析、评价和辅助决策等主要...     

Rb2CO3-CH3CH2OH-H2O三元体系20°C相平衡的研究

研究了Rb2 CO3-CH3CH2 OH -H2 O体系在 2 0°C下的相平衡 ,绘制了相应的溶度图。发现Rb2 CO3·2 .5H2 O的新物相 ,与以往报道的结果不一致     

海洋功能区划管理信息系统

海洋开发利用和保护已成为全球的热点。如何合理地利用海洋资源是未来社会经济可持续发展的重大问题。海洋功能区划是为实现海洋资源、社会经济可持续发展的重要举措。海洋功能区划管理信息系统是在地理信息系统的支持下,以海洋功能区划数据、基础地理数据和遥感数据为地理实体对象,集知识、分析、决策和服务为一体的系统。该系统从应用角度为空间数据管理和信息共享提供了一种可行的解决方案。本文以福建省海洋功能区划管理信息系统的建设为例,对系统的总体结构、功能、数据库和系统集成等方面进行了探讨。     

Status of Satellite Orbit Determination and Time Synchronization Technology for Global Navigation Satellite Systems

In the form of satellite ephemerides and clock parameters, the space datum and system time information of one global navigation satellite system (GNSS) is transferred to users. With the continuous updating in the satellite payload such as the high-precision atomic clock, the monitoring and tracking technique such as the inter-satellite link, and in the data processing technique, the accuracy and real-time performance of the satellite ephemeris and clock error products are steadily improved. Starting from December 27th, 2018, the BeiDou Navigation System 3, or BDS-3, has provided the accurate and reliable basic positioning, navigation, and timing (PNT) service for the users in the countries within the “one belt and one road”. This paper has summarized the faced challenges of the precise orbit determination and time synchronization from the regional BDS-2 system to the BDS-3 global system, and the specific solutions at the control segment. In addition, this paper has compared the BDS with other GNSS systems in terms of technical characteristics. Finally, aiming at a higher accuracy and more reliable PNT service, the road map of precise orbit determination and time synchronization technique for the next generation navigation systems is discussed, which will provide a reference for developing the global navigation satellite systems with an even higher accuracy.     

基于耦合模型的中国能源生产与消费预测及其环境响应(英文)

The paper presents the prediction of total energy production and consumption in all provinces and autonomous regions as well as determination of the variation of gravity center of the energy production, consumption and total discharge of industrial waste water, gas and residue of China via the energy and environmental quality data from 1978 to 2009 in China by use of GM(1,1) model and gravity center model, based on which the paper also analyzes the dynamic variation in regional difference in energy production, consumption and environmental quality and their relationship. The results are shown as follows. 1) The gravity center of energy production is gradually moving southwestward and the entire movement track approxi-mates to linear variation, indicating that the difference of energy production between the east and west, south and north is narrowing to a certain extent, with the difference between the east and the west narrowing faster than that between the south and the north. 2) The gravity center of energy consumption is moving southwestward with perceptible fluctuation, of which the gravity center position from 2000 to 2005 was relatively stable, with slight annual position variation, indicating that the growth rates of all provinces and autonomous regions are basically the same. 3) The gravity center of the total discharge of industrial waste water, gas and residue is characterized by fluctuation in longitude and latitude to a certain degree. But, it shows a southwestward trend on the whole. 4) There are common ground and discrepancy in the variation track of the gravity center of the energy production & consumption of China, and the comparative analysis of the gravity center of them and that of total discharge of industrial waste water, gas and residue shows that the environmental quality level is closely associated with the energy production and consumption (especially the energy consumption), indicating that the environment cost in economy of energy is higher in China.